std::default_initializable(3) Library Functions Manual std::default_initializable(3)

std::default_initializable - [concept.defaultinitializable], concept default_initializable

#include <concepts>

template<typename _Tp>
concept std::default_initializable =  constructible_from<_Tp>
      && requires
      {
        _Tp{};
        (void) ::new _Tp;
      }

[concept.defaultinitializable], concept default_initializable

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