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gsl-lite.hpp
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//
// gsl-lite is based on GSL: Guidelines Support Library.
// For more information see https://github.com/gsl-lite/gsl-lite
//
// Copyright (c) 2015-2018 Martin Moene
// Copyright (c) 2015-2018 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef GSL_GSL_LITE_HPP_INCLUDED
#define GSL_GSL_LITE_HPP_INCLUDED
#include <exception> // for exception, terminate(), uncaught_exceptions()
#include <limits>
#include <memory> // for addressof(), unique_ptr<>, shared_ptr<>
#include <iosfwd> // for basic_ostream<>
#include <ios> // for ios_base, streamsize
#include <stdexcept> // for logic_error
#include <string>
#include <utility> // for move(), forward<>(), swap()
#include <cstddef> // for size_t, ptrdiff_t, nullptr_t
#define gsl_lite_MAJOR 0
#define gsl_lite_MINOR 37
#define gsl_lite_PATCH 0
#define gsl_lite_VERSION gsl_STRINGIFY(gsl_lite_MAJOR) "." gsl_STRINGIFY(gsl_lite_MINOR) "." gsl_STRINGIFY(gsl_lite_PATCH)
#define gsl_STRINGIFY( x ) gsl_STRINGIFY_( x )
#define gsl_STRINGIFY_( x ) #x
#define gsl_CONCAT_( a, b ) gsl_CONCAT2_( a, b )
#define gsl_CONCAT2_( a, b ) a##b
#define gsl_EVALF_( f ) f()
// configuration argument checking:
#define gsl_DETAIL_CFG_TOGGLE_VALUE_1 1
#define gsl_DETAIL_CFG_TOGGLE_VALUE_0 1
#define gsl_DETAIL_CFG_DEFAULTS_VERSION_VALUE_1 1
#define gsl_DETAIL_CFG_DEFAULTS_VERSION_VALUE_0 1
#define gsl_DETAIL_CFG_STD_VALUE_98 1
#define gsl_DETAIL_CFG_STD_VALUE_3 1
#define gsl_DETAIL_CFG_STD_VALUE_03 1
#define gsl_DETAIL_CFG_STD_VALUE_11 1
#define gsl_DETAIL_CFG_STD_VALUE_14 1
#define gsl_DETAIL_CFG_STD_VALUE_17 1
#define gsl_DETAIL_CFG_STD_VALUE_20 1
#define gsl_DETAIL_CFG_NO_VALUE_ 1
#define gsl_CHECK_CFG_TOGGLE_VALUE_( x ) gsl_CONCAT_( gsl_DETAIL_CFG_TOGGLE_VALUE_, x )
#define gsl_CHECK_CFG_DEFAULTS_VERSION_VALUE_( x ) gsl_CONCAT_( gsl_DETAIL_CFG_DEFAULTS_VERSION_VALUE_, x )
#define gsl_CHECK_CFG_STD_VALUE_( x ) gsl_CONCAT_( gsl_DETAIL_CFG_STD_VALUE_, x )
#define gsl_CHECK_CFG_NO_VALUE_( x ) gsl_CONCAT_( gsl_DETAIL_CFG_NO_VALUE_, x )
// gsl-lite backward compatibility:
#if defined( gsl_CONFIG_DEFAULTS_VERSION )
# if ! gsl_CHECK_CFG_DEFAULTS_VERSION_VALUE_( gsl_CONFIG_DEFAULTS_VERSION )
# pragma message ("invalid configuration value gsl_CONFIG_DEFAULTS_VERSION=" gsl_STRINGIFY(gsl_CONFIG_DEFAULTS_VERSION) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_DEFAULTS_VERSION gsl_lite_MAJOR // default
#endif
# define gsl_CONFIG_DEFAULTS_VERSION_() gsl_CONFIG_DEFAULTS_VERSION
#if defined( gsl_CONFIG_ALLOWS_SPAN_CONTAINER_CTOR )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_ALLOWS_SPAN_CONTAINER_CTOR )
# pragma message ("invalid configuration value gsl_CONFIG_ALLOWS_SPAN_CONTAINER_CTOR=" gsl_STRINGIFY(gsl_CONFIG_ALLOWS_SPAN_CONTAINER_CTOR) ", must be 0 or 1")
# endif
# define gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR gsl_CONFIG_ALLOWS_SPAN_CONTAINER_CTOR
# pragma message ("gsl_CONFIG_ALLOWS_SPAN_CONTAINER_CTOR is deprecated since gsl-lite 0.7; replace with gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR, or consider span(with_container, cont).")
#endif
#if defined( gsl_CONFIG_CONTRACT_LEVEL_ON )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_CONTRACT_LEVEL_ON )
# pragma message ("invalid configuration value gsl_CONFIG_CONTRACT_LEVEL_ON=" gsl_STRINGIFY(gsl_CONFIG_CONTRACT_LEVEL_ON) "; macro must be defined without value")
# endif
# pragma message ("gsl_CONFIG_CONTRACT_LEVEL_ON is deprecated since gsl-lite 0.36; replace with gsl_CONFIG_CONTRACT_CHECKING_ON.")
# define gsl_CONFIG_CONTRACT_CHECKING_ON
#endif
#if defined( gsl_CONFIG_CONTRACT_LEVEL_OFF )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_CONTRACT_LEVEL_OFF )
# pragma message ("invalid configuration value gsl_CONFIG_CONTRACT_LEVEL_OFF=" gsl_STRINGIFY(gsl_CONFIG_CONTRACT_LEVEL_OFF) "; macro must be defined without value")
# endif
# pragma message ("gsl_CONFIG_CONTRACT_LEVEL_OFF is deprecated since gsl-lite 0.36; replace with gsl_CONFIG_CONTRACT_CHECKING_OFF.")
# define gsl_CONFIG_CONTRACT_CHECKING_OFF
#endif
#if defined( gsl_CONFIG_CONTRACT_LEVEL_EXPECTS_ONLY )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_CONTRACT_LEVEL_EXPECTS_ONLY )
# pragma message ("invalid configuration value gsl_CONFIG_CONTRACT_LEVEL_EXPECTS_ONLY=" gsl_STRINGIFY(gsl_CONFIG_CONTRACT_LEVEL_EXPECTS_ONLY) "; macro must be defined without value")
# endif
# pragma message ("gsl_CONFIG_CONTRACT_LEVEL_EXPECTS_ONLY is deprecated since gsl-lite 0.36; replace with gsl_CONFIG_CONTRACT_CHECKING_ENSURES_OFF.")
# define gsl_CONFIG_CONTRACT_CHECKING_ON
# define gsl_CONFIG_CONTRACT_CHECKING_ENSURES_OFF
#elif defined( gsl_CONFIG_CONTRACT_LEVEL_ENSURES_ONLY )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_CONTRACT_LEVEL_ENSURES_ONLY )
# pragma message ("invalid configuration value gsl_CONFIG_CONTRACT_LEVEL_ENSURES_ONLY=" gsl_STRINGIFY(gsl_CONFIG_CONTRACT_LEVEL_ENSURES_ONLY) "; macro must be defined without value")
# endif
# pragma message ("gsl_CONFIG_CONTRACT_LEVEL_ENSURES_ONLY is deprecated since gsl-lite 0.36; replace with gsl_CONFIG_CONTRACT_CHECKING_EXPECTS_OFF.")
# define gsl_CONFIG_CONTRACT_CHECKING_ON
# define gsl_CONFIG_CONTRACT_CHECKING_EXPECTS_OFF
#endif
// M-GSL compatibility:
#if defined( GSL_THROW_ON_CONTRACT_VIOLATION )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( GSL_THROW_ON_CONTRACT_VIOLATION )
# pragma message ("invalid configuration value GSL_THROW_ON_CONTRACT_VIOLATION=" gsl_STRINGIFY(GSL_THROW_ON_CONTRACT_VIOLATION) "; macro must be defined without value")
# endif
# define gsl_CONFIG_CONTRACT_VIOLATION_THROWS
#endif
#if defined( GSL_TERMINATE_ON_CONTRACT_VIOLATION )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( GSL_TERMINATE_ON_CONTRACT_VIOLATION )
# pragma message ("invalid configuration value GSL_TERMINATE_ON_CONTRACT_VIOLATION=" gsl_STRINGIFY(GSL_TERMINATE_ON_CONTRACT_VIOLATION) "; macro must be defined without value")
# endif
# define gsl_CONFIG_CONTRACT_VIOLATION_TERMINATES
#endif
#if defined( GSL_UNENFORCED_ON_CONTRACT_VIOLATION )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( GSL_UNENFORCED_ON_CONTRACT_VIOLATION )
# pragma message ("invalid configuration value GSL_UNENFORCED_ON_CONTRACT_VIOLATION=" gsl_STRINGIFY(GSL_UNENFORCED_ON_CONTRACT_VIOLATION) "; macro must be defined without value")
# endif
# define gsl_CONFIG_CONTRACT_CHECKING_OFF
#endif
// Configuration: Features
#if defined( gsl_FEATURE_WITH_CONTAINER_TO_STD )
# if ! gsl_CHECK_CFG_STD_VALUE_( gsl_FEATURE_WITH_CONTAINER_TO_STD )
# pragma message ("invalid configuration value gsl_FEATURE_WITH_CONTAINER_TO_STD=" gsl_STRINGIFY(gsl_FEATURE_WITH_CONTAINER_TO_STD) ", must be 98, 3, 11, 14, 17, or 20")
# endif
#else
# define gsl_FEATURE_WITH_CONTAINER_TO_STD 99 // default
#endif
#define gsl_FEATURE_WITH_CONTAINER_TO_STD_() gsl_FEATURE_WITH_CONTAINER_TO_STD
#if defined( gsl_FEATURE_MAKE_SPAN_TO_STD )
# if ! gsl_CHECK_CFG_STD_VALUE_( gsl_FEATURE_MAKE_SPAN_TO_STD )
# pragma message ("invalid configuration value gsl_FEATURE_MAKE_SPAN_TO_STD=" gsl_STRINGIFY(gsl_FEATURE_MAKE_SPAN_TO_STD) ", must be 98, 3, 11, 14, 17, or 20")
# endif
#else
# define gsl_FEATURE_MAKE_SPAN_TO_STD 99 // default
#endif
#define gsl_FEATURE_MAKE_SPAN_TO_STD_() gsl_FEATURE_MAKE_SPAN_TO_STD
#if defined( gsl_FEATURE_BYTE_SPAN_TO_STD )
# if ! gsl_CHECK_CFG_STD_VALUE_( gsl_FEATURE_BYTE_SPAN_TO_STD )
# pragma message ("invalid configuration value gsl_FEATURE_BYTE_SPAN_TO_STD=" gsl_STRINGIFY(gsl_FEATURE_BYTE_SPAN_TO_STD) ", must be 98, 3, 11, 14, 17, or 20")
# endif
#else
# define gsl_FEATURE_BYTE_SPAN_TO_STD 99 // default
#endif
#define gsl_FEATURE_BYTE_SPAN_TO_STD_() gsl_FEATURE_BYTE_SPAN_TO_STD
#if defined( gsl_FEATURE_IMPLICIT_MACRO )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_FEATURE_IMPLICIT_MACRO )
# pragma message ("invalid configuration value gsl_FEATURE_IMPLICIT_MACRO=" gsl_STRINGIFY(gsl_FEATURE_IMPLICIT_MACRO) ", must be 0 or 1")
# endif
#else
# define gsl_FEATURE_IMPLICIT_MACRO 0 // default
#endif
#define gsl_FEATURE_IMPLICIT_MACRO_() gsl_FEATURE_IMPLICIT_MACRO
#if defined( gsl_FEATURE_OWNER_MACRO )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_FEATURE_OWNER_MACRO )
# pragma message ("invalid configuration value gsl_FEATURE_OWNER_MACRO=" gsl_STRINGIFY(gsl_FEATURE_OWNER_MACRO) ", must be 0 or 1")
# endif
#else
# define gsl_FEATURE_OWNER_MACRO (gsl_CONFIG_DEFAULTS_VERSION == 0) // default
#endif
#define gsl_FEATURE_OWNER_MACRO_() gsl_FEATURE_OWNER_MACRO
#if defined( gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD )
# pragma message ("invalid configuration value gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD=" gsl_STRINGIFY(gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD) ", must be 0 or 1")
# endif
#else
# define gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD 0 // default
#endif
# define gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD_() gsl_FEATURE_EXPERIMENTAL_RETURN_GUARD
#if defined( gsl_FEATURE_GSL_LITE_NAMESPACE )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_FEATURE_GSL_LITE_NAMESPACE )
# pragma message ("invalid configuration value gsl_FEATURE_GSL_LITE_NAMESPACE=" gsl_STRINGIFY(gsl_FEATURE_GSL_LITE_NAMESPACE) ", must be 0 or 1")
# endif
#else
# define gsl_FEATURE_GSL_LITE_NAMESPACE (gsl_CONFIG_DEFAULTS_VERSION >= 1) // default
#endif
#define gsl_FEATURE_GSL_LITE_NAMESPACE_() gsl_FEATURE_GSL_LITE_NAMESPACE
// Configuration: Other
#if defined( gsl_CONFIG_TRANSPARENT_NOT_NULL )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_TRANSPARENT_NOT_NULL )
# pragma message ("invalid configuration value gsl_CONFIG_TRANSPARENT_NOT_NULL=" gsl_STRINGIFY(gsl_CONFIG_TRANSPARENT_NOT_NULL) ", must be 0 or 1")
# endif
# if gsl_CONFIG_TRANSPARENT_NOT_NULL && defined( gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF )
# error configuration option gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF is meaningless if gsl_CONFIG_TRANSPARENT_NOT_NULL=1
# endif
#else
# define gsl_CONFIG_TRANSPARENT_NOT_NULL (gsl_CONFIG_DEFAULTS_VERSION >= 1) // default
#endif
# define gsl_CONFIG_TRANSPARENT_NOT_NULL_() gsl_CONFIG_TRANSPARENT_NOT_NULL
#if ! defined( gsl_CONFIG_DEPRECATE_TO_LEVEL )
# if gsl_CONFIG_DEFAULTS_VERSION >= 1
# define gsl_CONFIG_DEPRECATE_TO_LEVEL 6
# else
# define gsl_CONFIG_DEPRECATE_TO_LEVEL 0
# endif
#endif
#if ! defined( gsl_CONFIG_SPAN_INDEX_TYPE )
# define gsl_CONFIG_SPAN_INDEX_TYPE std::size_t
#endif
# define gsl_CONFIG_SPAN_INDEX_TYPE_() gsl_CONFIG_SPAN_INDEX_TYPE
#if ! defined( gsl_CONFIG_INDEX_TYPE )
# if gsl_CONFIG_DEFAULTS_VERSION >= 1
// p0122r3 uses std::ptrdiff_t
# define gsl_CONFIG_INDEX_TYPE std::ptrdiff_t
# else
# define gsl_CONFIG_INDEX_TYPE gsl_CONFIG_SPAN_INDEX_TYPE
# endif
#endif
# define gsl_CONFIG_INDEX_TYPE_() gsl_CONFIG_INDEX_TYPE
#if defined( gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR )
# pragma message ("invalid configuration value gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR=" gsl_STRINGIFY(gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR (gsl_CONFIG_DEFAULTS_VERSION >= 1) // default
#endif
#define gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR_() gsl_CONFIG_NOT_NULL_EXPLICIT_CTOR
#if defined( gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF )
# pragma message ("invalid configuration value gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF=" gsl_STRINGIFY(gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF 0 // default
#endif
#define gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF_() gsl_CONFIG_NOT_NULL_GET_BY_CONST_REF
#if defined( gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS )
# pragma message ("invalid configuration value gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS=" gsl_STRINGIFY(gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS 0 // default
#endif
#define gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS_() gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS
#if defined( gsl_CONFIG_ALLOWS_SPAN_COMPARISON )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_ALLOWS_SPAN_COMPARISON )
# pragma message ("invalid configuration value gsl_CONFIG_ALLOWS_SPAN_COMPARISON=" gsl_STRINGIFY(gsl_CONFIG_ALLOWS_SPAN_COMPARISON) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_ALLOWS_SPAN_COMPARISON (gsl_CONFIG_DEFAULTS_VERSION == 0) // default
#endif
#define gsl_CONFIG_ALLOWS_SPAN_COMPARISON_() gsl_CONFIG_ALLOWS_SPAN_COMPARISON
#if defined( gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON )
# pragma message ("invalid configuration value gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON=" gsl_STRINGIFY(gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON 1 // default
#endif
#define gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON_() gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON
#if defined( gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR )
# pragma message ("invalid configuration value gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR=" gsl_STRINGIFY(gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR 0 // default
#endif
#define gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR_() gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR
#if defined( gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION )
# if ! gsl_CHECK_CFG_TOGGLE_VALUE_( gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION )
# pragma message ("invalid configuration value gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION=" gsl_STRINGIFY(gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION) ", must be 0 or 1")
# endif
#else
# define gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION (gsl_CONFIG_DEFAULTS_VERSION >= 1) // default
#endif
#define gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION_() gsl_CONFIG_NARROW_THROWS_ON_TRUNCATION
#if 1 < defined( gsl_CONFIG_CONTRACT_CHECKING_AUDIT ) + defined( gsl_CONFIG_CONTRACT_CHECKING_ON ) + defined( gsl_CONFIG_CONTRACT_CHECKING_OFF )
# error only one of gsl_CONFIG_CONTRACT_CHECKING_AUDIT, gsl_CONFIG_CONTRACT_CHECKING_ON, and gsl_CONFIG_CONTRACT_CHECKING_OFF may be defined
#endif
#if 1 < defined( gsl_CONFIG_CONTRACT_VIOLATION_THROWS ) + defined( gsl_CONFIG_CONTRACT_VIOLATION_TERMINATES ) + defined( gsl_CONFIG_CONTRACT_VIOLATION_CALLS_HANDLER )
# error only one of gsl_CONFIG_CONTRACT_VIOLATION_THROWS, gsl_CONFIG_CONTRACT_VIOLATION_TERMINATES, and gsl_CONFIG_CONTRACT_VIOLATION_CALLS_HANDLER may be defined
#endif
#if 1 < defined( gsl_CONFIG_UNENFORCED_CONTRACTS_ASSUME ) + defined( gsl_CONFIG_UNENFORCED_CONTRACTS_ELIDE )
# error only one of gsl_CONFIG_UNENFORCED_CONTRACTS_ASSUME and gsl_CONFIG_UNENFORCED_CONTRACTS_ELIDE may be defined
#endif
// C++ language version detection (C++20 is speculative):
// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
#ifndef gsl_CPLUSPLUS
# if defined(_MSVC_LANG ) && !defined(__clang__)
# define gsl_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
# else
# define gsl_CPLUSPLUS __cplusplus
# endif
#endif
// C++ standard library version:
#ifndef gsl_CPLUSPLUS_STDLIB
# define gsl_CPLUSPLUS_STDLIB gsl_CPLUSPLUS
#endif
#define gsl_CPP98_OR_GREATER ( gsl_CPLUSPLUS >= 199711L )
#define gsl_CPP11_OR_GREATER ( gsl_CPLUSPLUS >= 201103L )
#define gsl_CPP14_OR_GREATER ( gsl_CPLUSPLUS >= 201402L )
#define gsl_CPP17_OR_GREATER ( gsl_CPLUSPLUS >= 201703L )
#define gsl_CPP20_OR_GREATER ( gsl_CPLUSPLUS >= 202000L )
// C++ language version (represent 98 as 3):
#define gsl_CPLUSPLUS_V ( gsl_CPLUSPLUS / 100 - (gsl_CPLUSPLUS > 200000 ? 2000 : 1994) )
// half-open range [lo..hi):
#define gsl_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
// Compiler versions:
// MSVC++ 6.0 _MSC_VER == 1200 gsl_COMPILER_MSVC_VERSION == 60 (Visual Studio 6.0)
// MSVC++ 7.0 _MSC_VER == 1300 gsl_COMPILER_MSVC_VERSION == 70 (Visual Studio .NET 2002)
// MSVC++ 7.1 _MSC_VER == 1310 gsl_COMPILER_MSVC_VERSION == 71 (Visual Studio .NET 2003)
// MSVC++ 8.0 _MSC_VER == 1400 gsl_COMPILER_MSVC_VERSION == 80 (Visual Studio 2005)
// MSVC++ 9.0 _MSC_VER == 1500 gsl_COMPILER_MSVC_VERSION == 90 (Visual Studio 2008)
// MSVC++ 10.0 _MSC_VER == 1600 gsl_COMPILER_MSVC_VERSION == 100 (Visual Studio 2010)
// MSVC++ 11.0 _MSC_VER == 1700 gsl_COMPILER_MSVC_VERSION == 110 (Visual Studio 2012)
// MSVC++ 12.0 _MSC_VER == 1800 gsl_COMPILER_MSVC_VERSION == 120 (Visual Studio 2013)
// MSVC++ 14.0 _MSC_VER == 1900 gsl_COMPILER_MSVC_VERSION == 140 (Visual Studio 2015)
// MSVC++ 14.1 _MSC_VER >= 1910 gsl_COMPILER_MSVC_VERSION == 141 (Visual Studio 2017)
// MSVC++ 14.2 _MSC_VER >= 1920 gsl_COMPILER_MSVC_VERSION == 142 (Visual Studio 2019)
#if defined( _MSC_VER ) && ! defined( __clang__ )
# define gsl_COMPILER_MSVC_VER (_MSC_VER )
# define gsl_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) )
# define gsl_COMPILER_MSVC_VERSION_FULL (_MSC_VER - 100 * ( 5 + (_MSC_VER < 1900 ) ) )
#else
# define gsl_COMPILER_MSVC_VER 0
# define gsl_COMPILER_MSVC_VERSION 0
# define gsl_COMPILER_MSVC_VERSION_FULL 0
#endif
#define gsl_COMPILER_VERSION( major, minor, patch ) ( 10 * ( 10 * (major) + (minor) ) + (patch) )
// AppleClang 7.0.0 __apple_build_version__ == 7000172 gsl_COMPILER_APPLECLANG_VERSION == 700 (Xcode 7.0, 7.0.1) (LLVM 3.7.0)
// AppleClang 7.0.0 __apple_build_version__ == 7000176 gsl_COMPILER_APPLECLANG_VERSION == 700 (Xcode 7.1) (LLVM 3.7.0)
// AppleClang 7.0.2 __apple_build_version__ == 7000181 gsl_COMPILER_APPLECLANG_VERSION == 702 (Xcode 7.2, 7.2.1) (LLVM 3.7.0)
// AppleClang 7.3.0 __apple_build_version__ == 7030029 gsl_COMPILER_APPLECLANG_VERSION == 730 (Xcode 7.3) (LLVM 3.8.0)
// AppleClang 7.3.0 __apple_build_version__ == 7030031 gsl_COMPILER_APPLECLANG_VERSION == 730 (Xcode 7.3.1) (LLVM 3.8.0)
// AppleClang 8.0.0 __apple_build_version__ == 8000038 gsl_COMPILER_APPLECLANG_VERSION == 800 (Xcode 8.0) (LLVM 3.9.0)
// AppleClang 8.0.0 __apple_build_version__ == 8000042 gsl_COMPILER_APPLECLANG_VERSION == 800 (Xcode 8.1, 8.2, 8.2.1) (LLVM 3.9.0)
// AppleClang 8.1.0 __apple_build_version__ == 8020038 gsl_COMPILER_APPLECLANG_VERSION == 810 (Xcode 8.3) (LLVM 3.9.0)
// AppleClang 8.1.0 __apple_build_version__ == 8020041 gsl_COMPILER_APPLECLANG_VERSION == 810 (Xcode 8.3.1) (LLVM 3.9.0)
// AppleClang 8.1.0 __apple_build_version__ == 8020042 gsl_COMPILER_APPLECLANG_VERSION == 810 (Xcode 8.3.2, 8.3.3) (LLVM 3.9.0)
// AppleClang 9.0.0 __apple_build_version__ == 9000037 gsl_COMPILER_APPLECLANG_VERSION == 900 (Xcode 9.0) (LLVM 4.0.0)
// AppleClang 9.0.0 __apple_build_version__ == 9000038 gsl_COMPILER_APPLECLANG_VERSION == 900 (Xcode 9.1) (LLVM 4.0.0)
// AppleClang 9.0.0 __apple_build_version__ == 9000039 gsl_COMPILER_APPLECLANG_VERSION == 900 (Xcode 9.2) (LLVM 4.0.0)
// AppleClang 9.1.0 __apple_build_version__ == 9020039 gsl_COMPILER_APPLECLANG_VERSION == 910 (Xcode 9.3, 9.3.1) (LLVM 5.0.2)
// AppleClang 9.1.0 __apple_build_version__ == 9020039 gsl_COMPILER_APPLECLANG_VERSION == 910 (Xcode 9.4, 9.4.1) (LLVM 5.0.2)
// AppleClang 10.0.0 __apple_build_version__ == 10001145 gsl_COMPILER_APPLECLANG_VERSION == 1000 (Xcode 10.0, 10.1) (LLVM 6.0.1)
// AppleClang 10.0.1 __apple_build_version__ == 10010046 gsl_COMPILER_APPLECLANG_VERSION == 1001 (Xcode 10.2, 10.2.1, 10.3) (LLVM 7.0.0)
// AppleClang 11.0.0 __apple_build_version__ == 11000033 gsl_COMPILER_APPLECLANG_VERSION == 1100 (Xcode 11.1, 11.2, 11.3, 11.3.1) (LLVM 8.0.0)
// AppleClang 11.0.3 __apple_build_version__ == 11030032 gsl_COMPILER_APPLECLANG_VERSION == 1103 (Xcode 11.4, 11.4.1, 11.5, 11.6) (LLVM 9.0.0)
// AppleClang 12.0.0 __apple_build_version__ == 12000032 gsl_COMPILER_APPLECLANG_VERSION == 1200 (Xcode 12.0–12.4) (LLVM 10.0.0)
// AppleClang 12.0.5 __apple_build_version__ == 12050022 gsl_COMPILER_APPLECLANG_VERSION == 1205 (Xcode 12.5) (LLVM 10.0.0)
#if defined( __apple_build_version__ )
# define gsl_COMPILER_APPLECLANG_VERSION gsl_COMPILER_VERSION( __clang_major__, __clang_minor__, __clang_patchlevel__ )
# define gsl_COMPILER_CLANG_VERSION 0
#elif defined( __clang__ )
# define gsl_COMPILER_APPLECLANG_VERSION 0
# define gsl_COMPILER_CLANG_VERSION gsl_COMPILER_VERSION( __clang_major__, __clang_minor__, __clang_patchlevel__ )
#else
# define gsl_COMPILER_APPLECLANG_VERSION 0
# define gsl_COMPILER_CLANG_VERSION 0
#endif
#if defined( __GNUC__ ) && ! defined( __clang__ )
# define gsl_COMPILER_GNUC_VERSION gsl_COMPILER_VERSION( __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ )
#else
# define gsl_COMPILER_GNUC_VERSION 0
#endif
// Compiler non-strict aliasing:
#if defined(__clang__) || defined(__GNUC__)
# define gsl_may_alias __attribute__((__may_alias__))
#else
# define gsl_may_alias
#endif
// Presence of gsl, language and library features:
#define gsl_IN_STD( v ) ( ((v) == 98 ? 3 : (v)) >= gsl_CPLUSPLUS_V )
#define gsl_DEPRECATE_TO_LEVEL( level ) ( level <= gsl_CONFIG_DEPRECATE_TO_LEVEL )
#define gsl_FEATURE_TO_STD( feature ) gsl_IN_STD( gsl_FEATURE( feature##_TO_STD ) )
#define gsl_FEATURE( feature ) gsl_EVALF_( gsl_FEATURE_##feature##_ )
#define gsl_CONFIG( feature ) gsl_EVALF_( gsl_CONFIG_##feature##_ )
#define gsl_HAVE( feature ) gsl_EVALF_( gsl_HAVE_##feature##_ )
// Presence of wide character support:
#ifdef __DJGPP__
# define gsl_HAVE_WCHAR 0
#else
# define gsl_HAVE_WCHAR 1
#endif
#define gsl_HAVE_WCHAR_() gsl_HAVE_WCHAR
// Presence of language & library features:
#if gsl_COMPILER_CLANG_VERSION || gsl_COMPILER_APPLECLANG_VERSION
# ifdef __OBJC__
// There are a bunch of inconsistencies about __EXCEPTIONS and __has_feature(cxx_exceptions) in Clang 3.4/3.5/3.6.
// We're interested in C++ exceptions, which can be checked by __has_feature(cxx_exceptions) in 3.5+.
// In pre-3.5, __has_feature(cxx_exceptions) can be true if ObjC exceptions are enabled, but C++ exceptions are disabled.
// The recommended way to check is `__EXCEPTIONS && __has_feature(cxx_exceptions)`.
// See https://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro
// Note: this is only relevant in Objective-C++, thus the ifdef.
# if __EXCEPTIONS && __has_feature(cxx_exceptions)
# define gsl_HAVE_EXCEPTIONS 1
# else
# define gsl_HAVE_EXCEPTIONS 0
# endif // __EXCEPTIONS && __has_feature(cxx_exceptions)
# else
// clang-cl doesn't define __EXCEPTIONS for MSVC compatibility (see https://reviews.llvm.org/D4065).
// Neither does Clang in MS-compatiblity mode.
// Let's hope no one tries to build Objective-C++ code using MS-compatibility mode or clang-cl.
# if __has_feature(cxx_exceptions)
# define gsl_HAVE_EXCEPTIONS 1
# else
# define gsl_HAVE_EXCEPTIONS 0
# endif
# endif
#elif gsl_COMPILER_GNUC_VERSION
# if gsl_BETWEEN(gsl_COMPILER_GNUC_VERSION, 1, 500)
# ifdef __EXCEPTIONS
# define gsl_HAVE_EXCEPTIONS 1
# else
# define gsl_HAVE_EXCEPTIONS 0
# endif // __EXCEPTIONS
# else
# ifdef __cpp_exceptions
# define gsl_HAVE_EXCEPTIONS 1
# else
# define gsl_HAVE_EXCEPTIONS 0
# endif // __cpp_exceptions
# endif // gsl_BETWEEN(gsl_COMPILER_GNUC_VERSION, 1, 500)
#elif gsl_COMPILER_MSVC_VERSION
# ifdef _CPPUNWIND
# define gsl_HAVE_EXCEPTIONS 1
# else
# define gsl_HAVE_EXCEPTIONS 0
# endif // _CPPUNWIND
#else
// For all other compilers, assume exceptions are always enabled.
# define gsl_HAVE_EXCEPTIONS 1
#endif
#define gsl_HAVE_EXCEPTIONS_() gsl_HAVE_EXCEPTIONS
#if defined( gsl_CONFIG_CONTRACT_VIOLATION_THROWS ) && ! gsl_HAVE_EXCEPTIONS
# error Cannot use gsl_CONFIG_CONTRACT_VIOLATION_THROWS if exceptions are disabled.
#endif // defined( gsl_CONFIG_CONTRACT_VIOLATION_THROWS ) && !gsl_HAVE( EXCEPTIONS )
#ifdef _HAS_CPP0X
# define gsl_HAS_CPP0X _HAS_CPP0X
#else
# define gsl_HAS_CPP0X 0
#endif
#define gsl_CPP11_100 (gsl_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1600)
#define gsl_CPP11_110 (gsl_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1700)
#define gsl_CPP11_120 (gsl_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1800)
#define gsl_CPP11_140 (gsl_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1900)
#define gsl_CPP14_000 (gsl_CPP14_OR_GREATER)
#define gsl_CPP14_120 (gsl_CPP14_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1800)
#define gsl_CPP14_140 (gsl_CPP14_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1900)
#define gsl_CPP17_000 (gsl_CPP17_OR_GREATER)
#define gsl_CPP17_140 (gsl_CPP17_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1900)
#define gsl_CPP11_140_CPP0X_90 (gsl_CPP11_140 || (gsl_COMPILER_MSVC_VER >= 1500 && gsl_HAS_CPP0X))
#define gsl_CPP11_140_CPP0X_100 (gsl_CPP11_140 || (gsl_COMPILER_MSVC_VER >= 1600 && gsl_HAS_CPP0X))
// Presence of C++11 language features:
#define gsl_HAVE_AUTO gsl_CPP11_100
#define gsl_HAVE_RVALUE_REFERENCE gsl_CPP11_100
#define gsl_HAVE_FUNCTION_REF_QUALIFIER ( gsl_CPP11_140 && ! gsl_BETWEEN( gsl_COMPILER_GNUC_VERSION, 1, 481 ) )
#define gsl_HAVE_ENUM_CLASS gsl_CPP11_110
#define gsl_HAVE_ALIAS_TEMPLATE gsl_CPP11_120
#define gsl_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG gsl_CPP11_120
#define gsl_HAVE_EXPLICIT gsl_CPP11_120
#define gsl_HAVE_VARIADIC_TEMPLATE gsl_CPP11_120
#define gsl_HAVE_IS_DELETE gsl_CPP11_120
#define gsl_HAVE_CONSTEXPR_11 gsl_CPP11_140
#define gsl_HAVE_IS_DEFAULT gsl_CPP11_140
#define gsl_HAVE_NOEXCEPT gsl_CPP11_140
#define gsl_HAVE_NORETURN ( gsl_CPP11_140 && ! gsl_BETWEEN( gsl_COMPILER_GNUC_VERSION, 1, 480 ) )
#define gsl_HAVE_EXPRESSION_SFINAE gsl_CPP11_140
#define gsl_HAVE_OVERRIDE_FINAL gsl_CPP11_110
#define gsl_HAVE_AUTO_() gsl_HAVE_AUTO
#define gsl_HAVE_RVALUE_REFERENCE_() gsl_HAVE_RVALUE_REFERENCE
#define gsl_HAVE_FUNCTION_REF_QUALIFIER_() gsl_HAVE_FUNCTION_REF_QUALIFIER
#define gsl_HAVE_ENUM_CLASS_() gsl_HAVE_ENUM_CLASS
#define gsl_HAVE_ALIAS_TEMPLATE_() gsl_HAVE_ALIAS_TEMPLATE
#define gsl_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG_() gsl_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG
#define gsl_HAVE_EXPLICIT_() gsl_HAVE_EXPLICIT
#define gsl_HAVE_VARIADIC_TEMPLATE_() gsl_HAVE_VARIADIC_TEMPLATE
#define gsl_HAVE_IS_DELETE_() gsl_HAVE_IS_DELETE
#define gsl_HAVE_CONSTEXPR_11_() gsl_HAVE_CONSTEXPR_11
#define gsl_HAVE_IS_DEFAULT_() gsl_HAVE_IS_DEFAULT
#define gsl_HAVE_NOEXCEPT_() gsl_HAVE_NOEXCEPT
#define gsl_HAVE_NORETURN_() gsl_HAVE_NORETURN
#define gsl_HAVE_EXPRESSION_SFINAE_() gsl_HAVE_EXPRESSION_SFINAE
#define gsl_HAVE_OVERRIDE_FINAL_() gsl_HAVE_OVERRIDE_FINAL
// Presence of C++14 language features:
#define gsl_HAVE_CONSTEXPR_14 ( gsl_CPP14_000 && ! gsl_BETWEEN( gsl_COMPILER_GNUC_VERSION, 1, 600 ) )
#define gsl_HAVE_DECLTYPE_AUTO gsl_CPP14_140
#define gsl_HAVE_DEPRECATED ( gsl_CPP14_140 && ! gsl_BETWEEN( gsl_COMPILER_MSVC_VERSION, 1, 142 ) )
#define gsl_HAVE_CONSTEXPR_14_() gsl_HAVE_CONSTEXPR_14
#define gsl_HAVE_DECLTYPE_AUTO_() gsl_HAVE_DECLTYPE_AUTO
#define gsl_HAVE_DEPRECATED_() gsl_HAVE_DEPRECATED
// Presence of C++17 language features:
// MSVC: template parameter deduction guides since Visual Studio 2017 v15.7
#define gsl_HAVE_ENUM_CLASS_CONSTRUCTION_FROM_UNDERLYING_TYPE gsl_CPP17_000
#define gsl_HAVE_DEDUCTION_GUIDES ( gsl_CPP17_000 && ! gsl_BETWEEN( gsl_COMPILER_MSVC_VERSION_FULL, 1, 1414 ) )
#define gsl_HAVE_NODISCARD gsl_CPP17_000
#define gsl_HAVE_CONSTEXPR_17 gsl_CPP17_OR_GREATER
#define gsl_HAVE_ENUM_CLASS_CONSTRUCTION_FROM_UNDERLYING_TYPE_() gsl_HAVE_ENUM_CLASS_CONSTRUCTION_FROM_UNDERLYING_TYPE
#define gsl_HAVE_DEDUCTION_GUIDES_() gsl_HAVE_DEDUCTION_GUIDES
#define gsl_HAVE_NODISCARD_() gsl_HAVE_NODISCARD
#define gsl_HAVE_CONSTEXPR_17_() gsl_HAVE_CONSTEXPR_17
// Presence of C++20 language features:
#define gsl_HAVE_CONSTEXPR_20 gsl_CPP20_OR_GREATER
#define gsl_HAVE_CONSTEXPR_20_() gsl_HAVE_CONSTEXPR_20
// Presence of C++ library features:
#define gsl_STDLIB_CPP98_OR_GREATER gsl_CPP98_OR_GREATER
#define gsl_STDLIB_CPP11_OR_GREATER gsl_CPP11_OR_GREATER
#define gsl_STDLIB_CPP14_OR_GREATER gsl_CPP14_OR_GREATER
#define gsl_STDLIB_CPP17_OR_GREATER gsl_CPP17_OR_GREATER
#define gsl_STDLIB_CPP20_OR_GREATER gsl_CPP20_OR_GREATER
#define gsl_STDLIB_CPP11_100 (gsl_STDLIB_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1600)
#define gsl_STDLIB_CPP11_110 (gsl_STDLIB_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1700)
#define gsl_STDLIB_CPP11_120 (gsl_STDLIB_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1800)
#define gsl_STDLIB_CPP11_140 (gsl_STDLIB_CPP11_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1900)
#define gsl_STDLIB_CPP14_000 (gsl_STDLIB_CPP14_OR_GREATER)
#define gsl_STDLIB_CPP14_120 (gsl_STDLIB_CPP14_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1800)
#define gsl_STDLIB_CPP14_140 (gsl_STDLIB_CPP14_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1900)
#define gsl_STDLIB_CPP17_000 (gsl_STDLIB_CPP17_OR_GREATER)
#define gsl_STDLIB_CPP17_140 (gsl_STDLIB_CPP17_OR_GREATER || gsl_COMPILER_MSVC_VER >= 1900)
#define gsl_STDLIB_CPP11_140_CPP0X_90 (gsl_STDLIB_CPP11_140 || (gsl_COMPILER_MSVC_VER >= 1500 && gsl_HAS_CPP0X))
#define gsl_STDLIB_CPP11_140_CPP0X_100 (gsl_STDLIB_CPP11_140 || (gsl_COMPILER_MSVC_VER >= 1600 && gsl_HAS_CPP0X))
#define gsl_HAVE_ADDRESSOF gsl_STDLIB_CPP17_000
#define gsl_HAVE_ARRAY gsl_STDLIB_CPP11_110
#define gsl_HAVE_TYPE_TRAITS gsl_STDLIB_CPP11_110
#define gsl_HAVE_TR1_TYPE_TRAITS gsl_STDLIB_CPP11_110
#define gsl_HAVE_CONTAINER_DATA_METHOD gsl_STDLIB_CPP11_140_CPP0X_90
#define gsl_HAVE_STD_DATA gsl_STDLIB_CPP17_000
#ifdef __cpp_lib_ssize
# define gsl_HAVE_STD_SSIZE 1
#else
# define gsl_HAVE_STD_SSIZE ( gsl_COMPILER_GNUC_VERSION >= 1000 && __cplusplus > 201703L )
#endif
#define gsl_HAVE_HASH gsl_STDLIB_CPP11_120
#define gsl_HAVE_SIZED_TYPES gsl_STDLIB_CPP11_140
#define gsl_HAVE_MAKE_SHARED gsl_STDLIB_CPP11_140_CPP0X_100
#define gsl_HAVE_SHARED_PTR gsl_STDLIB_CPP11_140_CPP0X_100
#define gsl_HAVE_UNIQUE_PTR gsl_STDLIB_CPP11_140_CPP0X_100
#define gsl_HAVE_MAKE_UNIQUE gsl_STDLIB_CPP14_120
#define gsl_HAVE_MOVE_FORWARD gsl_STDLIB_CPP11_100
#define gsl_HAVE_NULLPTR gsl_STDLIB_CPP11_100
#define gsl_HAVE_UNCAUGHT_EXCEPTIONS gsl_STDLIB_CPP17_140
#define gsl_HAVE_ADD_CONST gsl_HAVE_TYPE_TRAITS
#define gsl_HAVE_INITIALIZER_LIST gsl_STDLIB_CPP11_120
#define gsl_HAVE_INTEGRAL_CONSTANT gsl_HAVE_TYPE_TRAITS
#define gsl_HAVE_REMOVE_CONST gsl_HAVE_TYPE_TRAITS
#define gsl_HAVE_REMOVE_REFERENCE gsl_HAVE_TYPE_TRAITS
#define gsl_HAVE_REMOVE_CVREF gsl_STDLIB_CPP20_OR_GREATER
#define gsl_HAVE_TR1_ADD_CONST gsl_HAVE_TR1_TYPE_TRAITS
#define gsl_HAVE_TR1_INTEGRAL_CONSTANT gsl_HAVE_TR1_TYPE_TRAITS
#define gsl_HAVE_TR1_REMOVE_CONST gsl_HAVE_TR1_TYPE_TRAITS
#define gsl_HAVE_TR1_REMOVE_REFERENCE gsl_HAVE_TR1_TYPE_TRAITS
#define gsl_HAVE_ADDRESSOF_() gsl_HAVE_ADDRESSOF
#define gsl_HAVE_ARRAY_() gsl_HAVE_ARRAY
#define gsl_HAVE_TYPE_TRAITS_() gsl_HAVE_TYPE_TRAITS
#define gsl_HAVE_TR1_TYPE_TRAITS_() gsl_HAVE_TR1_TYPE_TRAITS
#define gsl_HAVE_CONTAINER_DATA_METHOD_() gsl_HAVE_CONTAINER_DATA_METHOD
#define gsl_HAVE_HASH_() gsl_HAVE_HASH
#define gsl_HAVE_STD_DATA_() gsl_HAVE_STD_DATA
#define gsl_HAVE_STD_SSIZE_() gsl_HAVE_STD_SSIZE
#define gsl_HAVE_SIZED_TYPES_() gsl_HAVE_SIZED_TYPES
#define gsl_HAVE_MAKE_SHARED_() gsl_HAVE_MAKE_SHARED
#define gsl_HAVE_MOVE_FORWARD_() gsl_HAVE_MOVE_FORWARD
#define gsl_HAVE_NULLPTR_() gsl_HAVE_NULLPTR // It's a language feature but needs library support, so we list it as a library feature.
#define gsl_HAVE_SHARED_PTR_() gsl_HAVE_SHARED_PTR
#define gsl_HAVE_UNIQUE_PTR_() gsl_HAVE_UNIQUE_PTR
#define gsl_HAVE_MAKE_UNIQUE_() gsl_HAVE_MAKE_UNIQUE
#define gsl_HAVE_UNCAUGHT_EXCEPTIONS_() gsl_HAVE_UNCAUGHT_EXCEPTIONS
#define gsl_HAVE_ADD_CONST_() gsl_HAVE_ADD_CONST
#define gsl_HAVE_INITIALIZER_LIST_() gsl_HAVE_INITIALIZER_LIST // It's a language feature but needs library support, so we list it as a library feature.
#define gsl_HAVE_INTEGRAL_CONSTANT_() gsl_HAVE_INTEGRAL_CONSTANT
#define gsl_HAVE_REMOVE_CONST_() gsl_HAVE_REMOVE_CONST
#define gsl_HAVE_REMOVE_REFERENCE_() gsl_HAVE_REMOVE_REFERENCE
#define gsl_HAVE_REMOVE_CVREF_() gsl_HAVE_REMOVE_CVREF
#define gsl_HAVE_TR1_ADD_CONST_() gsl_HAVE_TR1_ADD_CONST
#define gsl_HAVE_TR1_INTEGRAL_CONSTANT_() gsl_HAVE_TR1_INTEGRAL_CONSTANT
#define gsl_HAVE_TR1_REMOVE_CONST_() gsl_HAVE_TR1_REMOVE_CONST
#define gsl_HAVE_TR1_REMOVE_REFERENCE_() gsl_HAVE_TR1_REMOVE_REFERENCE
// C++ feature usage:
#if gsl_HAVE( ADDRESSOF )
# define gsl_ADDRESSOF(x) std::addressof(x)
#else
# define gsl_ADDRESSOF(x) (&x)
#endif
#if gsl_HAVE( CONSTEXPR_11 )
# define gsl_constexpr constexpr
#else
# define gsl_constexpr /*constexpr*/
#endif
#if gsl_HAVE( CONSTEXPR_14 )
# define gsl_constexpr14 constexpr
#else
# define gsl_constexpr14 /*constexpr*/
#endif
#if gsl_HAVE( CONSTEXPR_17 )
# define gsl_constexpr17 constexpr
#else
# define gsl_constexpr17 /*constexpr*/
#endif
#if gsl_HAVE( CONSTEXPR_20 )
# define gsl_constexpr20 constexpr
#else
# define gsl_constexpr20 /*constexpr*/
#endif
#if gsl_HAVE( EXPLICIT )
# define gsl_explicit explicit
#else
# define gsl_explicit /*explicit*/
#endif
#if gsl_FEATURE( IMPLICIT_MACRO )
# define implicit /*implicit*/
#endif
#if gsl_HAVE( IS_DELETE )
# define gsl_is_delete = delete
#else
# define gsl_is_delete
#endif
#if gsl_HAVE( IS_DELETE )
# define gsl_is_delete_access public
#else
# define gsl_is_delete_access private
#endif
#if !gsl_HAVE( NOEXCEPT ) || defined( gsl_TESTING_ )
# define gsl_noexcept /*noexcept*/
# define gsl_noexcept_if( expr ) /*noexcept( expr )*/
#else
# define gsl_noexcept noexcept
# define gsl_noexcept_if( expr ) noexcept( expr )
#endif
#if gsl_HAVE( NULLPTR )
# define gsl_nullptr nullptr
#else
# define gsl_nullptr NULL
#endif
#if gsl_HAVE( NODISCARD )
# define gsl_NODISCARD [[nodiscard]]
#else
# define gsl_NODISCARD
#endif
#if gsl_HAVE( NORETURN )
# define gsl_NORETURN [[noreturn]]
#elif defined(_MSC_VER)
# define gsl_NORETURN __declspec(noreturn)
#else
# define gsl_NORETURN
#endif
#if gsl_HAVE( DEPRECATED ) && ! defined( gsl_TESTING_ )
# define gsl_DEPRECATED [[deprecated]]
# define gsl_DEPRECATED_MSG( msg ) [[deprecated( msg )]]
#else
# define gsl_DEPRECATED
# define gsl_DEPRECATED_MSG( msg )
#endif
#if gsl_HAVE( TYPE_TRAITS )
# define gsl_STATIC_ASSERT_( cond, msg ) static_assert( cond, msg )
#else
# define gsl_STATIC_ASSERT_( cond, msg ) ( ( void )sizeof( char[1 - 2*!!( cond ) ] ) )
#endif
#if gsl_HAVE( TYPE_TRAITS )
#define gsl_DEFINE_ENUM_BITMASK_OPERATORS_( ENUM ) \
gsl_NODISCARD gsl_api inline gsl_constexpr ENUM \
operator~( ENUM val ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return ENUM( ~U( val ) ); \
} \
gsl_NODISCARD gsl_api inline gsl_constexpr ENUM \
operator|( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return ENUM( U( lhs ) | U( rhs ) ); \
} \
gsl_NODISCARD gsl_api inline gsl_constexpr ENUM \
operator&( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return ENUM( U( lhs ) & U( rhs ) ); \
} \
gsl_NODISCARD gsl_api inline gsl_constexpr ENUM \
operator^( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return ENUM( U( lhs ) ^ U( rhs ) ); \
} \
gsl_api inline gsl_constexpr14 ENUM & \
operator|=( ENUM & lhs, ENUM rhs ) gsl_noexcept \
{ \
return lhs = lhs | rhs; \
} \
gsl_api inline gsl_constexpr14 ENUM & \
operator&=( ENUM & lhs, ENUM rhs ) gsl_noexcept \
{ \
return lhs = lhs & rhs; \
} \
gsl_api inline gsl_constexpr14 ENUM & \
operator^=( ENUM & lhs, ENUM rhs ) gsl_noexcept \
{ \
return lhs = lhs ^ rhs; \
}
#define gsl_DEFINE_ENUM_RELATIONAL_OPERATORS_( ENUM ) \
gsl_NODISCARD gsl_api inline gsl_constexpr bool \
operator<( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return U( lhs ) < U( rhs ); \
} \
gsl_NODISCARD gsl_api inline gsl_constexpr bool \
operator>( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return U( lhs ) > U( rhs ); \
} \
gsl_NODISCARD gsl_api inline gsl_constexpr bool \
operator<=( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return U( lhs ) <= U( rhs ); \
} \
gsl_NODISCARD gsl_api inline gsl_constexpr bool \
operator>=( ENUM lhs, ENUM rhs ) gsl_noexcept \
{ \
typedef typename ::gsl::std11::underlying_type<ENUM>::type U; \
return U( lhs ) >= U( rhs ); \
}
//
// Defines bitmask operators `|`, `&`, `^`, `~`, `|=`, `&=`, and `^=` for the given enum type.
//
// enum class Vegetables {
// tomato = 0b001,
// onion = 0b010,
// eggplant = 0b100
// };
// gsl_DEFINE_ENUM_BITMASK_OPERATORS( Vegetables )
//
#define gsl_DEFINE_ENUM_BITMASK_OPERATORS( ENUM ) gsl_DEFINE_ENUM_BITMASK_OPERATORS_( ENUM )
//
// Defines relational operators `<`, `>`, `<=`, `>=` for the given enum type.
//
// enum class OperatorPrecedence {
// additive = 0,
// multiplicative = 1,
// power = 2
// };
// gsl_DEFINE_ENUM_RELATIONAL_OPERATORS( OperatorPrecedence )
//
#define gsl_DEFINE_ENUM_RELATIONAL_OPERATORS( ENUM ) gsl_DEFINE_ENUM_RELATIONAL_OPERATORS_( ENUM )
#endif // gsl_HAVE( TYPE_TRAITS )
#define gsl_DIMENSION_OF( a ) ( sizeof(a) / sizeof(0[a]) )
// Method enabling (C++98, VC120 (VS2013) cannot use __VA_ARGS__)
#if gsl_HAVE( EXPRESSION_SFINAE )
# define gsl_DECLTYPE_(T, EXPR) decltype( EXPR )
#else
# define gsl_DECLTYPE_(T, EXPR) T
#endif
// NOTE: When using SFINAE in gsl-lite, please note that overloads of function templates must always use SFINAE with non-type default arguments
// as explained in https://en.cppreference.com/w/cpp/types/enable_if#Notes. `gsl_ENABLE_IF_()` implements graceful fallback to default
// type arguments (for compilers that don't support non-type default arguments); please verify that this is appropriate in the given
// situation, and add additional checks if necessary.
//
// Also, please note that `gsl_ENABLE_IF_()` doesn't enforce the constraint at all if no compiler/library support is available (i.e. pre-C++11).
#if gsl_HAVE( TYPE_TRAITS ) && gsl_HAVE( DEFAULT_FUNCTION_TEMPLATE_ARG )
# if !gsl_BETWEEN( gsl_COMPILER_MSVC_VERSION, 1, 140 ) // VS 2013 seems to have trouble with SFINAE for default non-type arguments
# define gsl_ENABLE_IF_(VA) , typename std::enable_if< ( VA ), int >::type = 0
# else
# define gsl_ENABLE_IF_(VA) , typename = typename std::enable_if< ( VA ), ::gsl::detail::enabler >::type
# endif
#else
# define gsl_ENABLE_IF_(VA)
#endif
// Other features:
#define gsl_HAVE_CONSTRAINED_SPAN_CONTAINER_CTOR ( gsl_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG && gsl_HAVE_CONTAINER_DATA_METHOD )
#define gsl_HAVE_CONSTRAINED_SPAN_CONTAINER_CTOR_() gsl_HAVE_CONSTRAINED_SPAN_CONTAINER_CTOR
// Note: !defined(__NVCC__) doesn't work with nvcc here:
#define gsl_HAVE_UNCONSTRAINED_SPAN_CONTAINER_CTOR ( gsl_CONFIG_ALLOWS_UNCONSTRAINED_SPAN_CONTAINER_CTOR && (__NVCC__== 0) )
#define gsl_HAVE_UNCONSTRAINED_SPAN_CONTAINER_CTOR_() gsl_HAVE_UNCONSTRAINED_SPAN_CONTAINER_CTOR
// GSL API (e.g. for CUDA platform):
// Guidelines for using `gsl_api`:
//
// NVCC imposes the restriction that a function annotated `__host__ __device__` cannot call host-only or device-only functions.
// This makes `gsl_api` inappropriate for generic functions that call unknown code, e.g. the template constructors of `span<>`
// or functions like `finally()` which accept an arbitrary function object.
// It is often preferable to annotate functions only with `gsl_constexpr` or `gsl_constexpr14`. The "extended constexpr" mode
// of NVCC (currently an experimental feature) will implicitly consider constexpr functions `__host__ __device__` functions
// but tolerates calls to host-only or device-only functions.
#ifndef gsl_api
# ifdef __CUDACC__
# define gsl_api __host__ __device__
# else
# define gsl_api /*gsl_api*/
# endif
#endif
// Additional includes:
#if ! gsl_CPP11_OR_GREATER
# include <algorithm> // for swap() before C++11
#endif // ! gsl_CPP11_OR_GREATER
#if gsl_HAVE( ARRAY )
# include <array> // indirectly includes reverse_iterator<>
#endif
#if ! gsl_HAVE( ARRAY )
# include <iterator> // for reverse_iterator<>
#endif
#if !gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || !gsl_HAVE( AUTO )
# include <vector>
#endif
#if gsl_HAVE( INITIALIZER_LIST )
# include <initializer_list>
#endif
#if gsl_HAVE( TYPE_TRAITS )
# include <type_traits> // for enable_if<>,
// add_const<>, add_pointer<>, common_type<>, make_signed<>, remove_cv<>, remove_const<>, remove_volatile<>, remove_reference<>, remove_cvref<>, remove_pointer<>, underlying_type<>,
// is_assignable<>, is_constructible<>, is_const<>, is_convertible<>, is_integral<>, is_pointer<>, is_signed<>,
// integral_constant<>, declval()
#elif gsl_HAVE( TR1_TYPE_TRAITS )
# include <tr1/type_traits> // for add_const<>, remove_cv<>, remove_const<>, remove_volatile<>, remove_reference<>, integral_constant<>
#endif
#if gsl_FEATURE( EXPERIMENTAL_RETURN_GUARD )
// Declare __cxa_get_globals() or equivalent in namespace gsl::detail for uncaught_exceptions():
# if ! gsl_HAVE( UNCAUGHT_EXCEPTIONS )
# if defined( _MSC_VER ) // MS-STL with either MSVC or clang-cl
namespace gsl { namespace detail { extern "C" char * __cdecl _getptd(); } }
# elif gsl_COMPILER_CLANG_VERSION || gsl_COMPILER_GNUC_VERSION || gsl_COMPILER_APPLECLANG_VERSION
# if defined( __GLIBCXX__ ) || defined( __GLIBCPP__ ) // libstdc++: prototype from cxxabi.h
# include <cxxabi.h>
# elif ! defined( BOOST_CORE_UNCAUGHT_EXCEPTIONS_HPP_INCLUDED_ ) // libc++: prototype from Boost?
# if defined( __FreeBSD__ ) || defined( __OpenBSD__ )
namespace __cxxabiv1 { struct __cxa_eh_globals; extern "C" __cxa_eh_globals * __cxa_get_globals(); }
# else
namespace __cxxabiv1 { struct __cxa_eh_globals; extern "C" __cxa_eh_globals * __cxa_get_globals() gsl_noexcept; }
# endif
# endif
namespace gsl { namespace detail { using ::__cxxabiv1::__cxa_get_globals; } }
# endif
# endif // ! gsl_HAVE( UNCAUGHT_EXCEPTIONS )
#endif // gsl_FEATURE( EXPERIMENTAL_RETURN_GUARD )
// MSVC warning suppression macros:
#if gsl_COMPILER_MSVC_VERSION >= 140 && !defined(__NVCC__)
# define gsl_SUPPRESS_MSGSL_WARNING(expr) [[gsl::suppress(expr)]]
# define gsl_SUPPRESS_MSVC_WARNING(code, descr) __pragma(warning(suppress: code) )
# define gsl_DISABLE_MSVC_WARNINGS(codes) __pragma(warning(push)) __pragma(warning(disable: codes))
# define gsl_RESTORE_MSVC_WARNINGS() __pragma(warning(pop ))
#else
// TODO: define for Clang
# define gsl_SUPPRESS_MSGSL_WARNING(expr)
# define gsl_SUPPRESS_MSVC_WARNING(code, descr)
# define gsl_DISABLE_MSVC_WARNINGS(codes)
# define gsl_RESTORE_MSVC_WARNINGS()
#endif
// Suppress the following MSVC GSL warnings:
// - C26432: gsl::c.21 : if you define or delete any default operation in the type '...', define or delete them all
// - C26410: gsl::r.32 : the parameter 'ptr' is a reference to const unique pointer, use const T* or const T& instead
// - C26415: gsl::r.30 : smart pointer parameter 'ptr' is used only to access contained pointer. Use T* or T& instead
// - C26418: gsl::r.36 : shared pointer parameter 'ptr' is not copied or moved. Use T* or T& instead
// - C26472: gsl::t.1 : don't use a static_cast for arithmetic conversions;
// use brace initialization, gsl::narrow_cast or gsl::narrow
// - C26439: gsl::f.6 : special function 'function' can be declared 'noexcept'
// - C26440: gsl::f.6 : function 'function' can be declared 'noexcept'
// - C26455: gsl::f.6 : default constructor may not throw. Declare it 'noexcept'
// - C26473: gsl::t.1 : don't cast between pointer types where the source type and the target type are the same
// - C26481: gsl::b.1 : don't use pointer arithmetic. Use span instead
// - C26482: gsl::b.2 : only index into arrays using constant expressions
// - C26446: gdl::b.4 : prefer to use gsl::at() instead of unchecked subscript operator
// - C26490: gsl::t.1 : don't use reinterpret_cast
// - C26487: gsl::l.4 : don't return a pointer '(<some number>'s result)' that may be invalid
gsl_DISABLE_MSVC_WARNINGS( 26432 26410 26415 26418 26472 26439 26440 26455 26473 26481 26482 26446 26490 26487 )
namespace gsl {
// forward declare span<>:
template< class T >
class span;
// C++98 emulation:
namespace std98 {
// We implement `equal()` and `lexicographical_compare()` here to avoid having to pull in the <algorithm> header.
template< class InputIt1, class InputIt2 >