Add constexpr support for dynamic allocated cpp_int #654
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Added constexpr support for dynamic allocated
cpp_ints as long as compiler implements features__cpp_constexpr_dynamic_allocand__cpp_lib_constexpr_dynamic_allocfrom P0784R7.If those features are disabled, it behaves as the current implementation. Note that those features require C++20, so they will only work when passing
-std=c++2a(or beyond) flag during compilation through a supported compiler (tested here ong++-11+ andclang++-16+ using libstdc++ withg++-10+ toolset on ubuntu noble).It might work on
g++-10, but for some reason the b2 check forif constexprkeep returning "no" for it.Also fixed constexpr construction from strings and added some tests for construction/operations on dynamic allocated
cpp_ints.Had to make small changes to existing code to tackle some warnings given when compiled without the feature's support (such as uninitialized variables not being supported in constexpr methods before C++20).