fix: include missing <functional> header #68
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Thanks for catching this! It didn't pop up compiling on Ubuntu 20 or MacOS |
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I was getting compilation error, due to the missing header which says
error: ‘plus’ is not a member of ‘std’error: ‘minus’ is not a member of ‘std’These function objects are defined in header <functional> since C++-14.
So I included this header.
This PR is also related with issue #50