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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../concepts/default_initializable.html below:

std::default_initializable - cppreference.com

template< class T > concept default_initializable = std::constructible_from<T> && requires { T{}; } && /* T t; is well-formed, see below */; (since C++20)

The default_initializable concept checks whether variables of type T can be

value-initialized (i.e., whether T() is well-formed);
direct-list-initialized from an empty initializer list (i.e., whether T{} is well-formed); and
default-initialized (i.e., whether T t; is well-formed).

Access checking is performed as if in a context unrelated to T. Only the validity of the immediate context of the variable initialization is considered.

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C++23 standard (ISO/IEC 14882:2024):

18.4.12 Concept default_initializable [concept.default.init]

C++20 standard (ISO/IEC 14882:2020):

18.4.12 Concept default_initializable [concept.default.init]

[edit] See also

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