Starting with release 1.13.0, C++17 standard will be the lowest fully supported version.

What does that mean for POCO users?

1. it will be possible to build POCO with lower versions, but without some features that require C++17
2. given 1., all the existing user code will continue to work with new versions
3. g++ and clang default will become -std=c++17
4. Visual Studio 2022 default will become /std:c++17 /std:c11; older VS versions will remain as they are

• fix std::iterator deprecated warnings