std::nontype, std::nontype_t - cppreference.com
From cppreference.com
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(1) | (since C++26) |
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(2) | (since C++26) |
1) The class template std::nontype_t can be used in the constructor's parameter list to match the intended tag.
2) The corresponding std::nontype instance of (1) is a disambiguation argument tag that can be passed to the constructors of std::function_ref to indicate that the contained object should be constructed with the value of the non-type template parameter V.