Convert deprecated call to ptr_fun to lambda #85
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ptr_fun has been deprecated in C++11 and removed in C++17, so the code currently does not build with GCC 12.2.1.
This PR replaces the use of ptr_fun with a local lambda.
See:
https://en.cppreference.com/w/cpp/utility/functional/ptr_fun
And the same solution here, that is applied in this PR:
https://stackoverflow.com/questions/44973435/stdptr-fun-replacement-for-c17
Fixes #82