Error c4996 in MSVC

[Ok23]

In visual studio 2019 16.5 compiller tell the std::iterator class template is deprecated in C++17

Error C4996 'std::iterator<std::input_iterator_tag,std::pairsol::object,sol::object,ptrdiff_t,std::pairsol::object,sol::object *,std::pairsol::object,sol::object &>': warning STL4015: The std::iterator class template (used as a base class to provide typedefs) is deprecated in C++17. (The header is NOT deprecated.) The C++ Standard has never required user-defined iterators to derive from std::iterator. To fix this warning, stop deriving from std::iterator and start providing publicly accessible typedefs named iterator_category, value_type, difference_type, pointer, and reference. Note that value_type is required to be non-const, even for constant iterators. You can define _SILENCE_CXX17_ITERATOR_BASE_CLASS_DEPRECATION_WARNING or _SILENCE_ALL_CXX17_DEPRECATION_WARNINGS to acknowledge that you have received this warning.

[ThePhD]

We don't use std::iterator anywhere in the cde.

I don't get this error either, with a naked build in a fresh Visuual Studio 2017 or 2019 project. Are you using an old version of sol2? They might have std::iterator references but the new code should not have any whatsoever.

[Ok23]

I use 3.2.0 version. I supress this error, so this error is not critical.

[ThePhD]

Alright. If you can give a more detailed report about what is causing this error next time, if it comes up again, do let me know.

[Ok23]

In 3.2.0 in file table_iterator.hpp class basic_table_iterator inherited by std::iterator which deprecated in C++17

class basic_table_iterator : public std::iterator<std::input_iterator_tag, std::pair<object, object>>