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by badmintonbaseba
612 days ago
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The cppreference page says: > If the program adds specializations for std::is_fundamental or std::is_fundamental_v, the behavior is undefined. This is an oversimplification. The actual rule is https://eel.is/c++draft/library#namespace.std-2 . > the specialization meets the standard library requirements for the original template. For is_fundamental<YourClassType> it means that is_fundamental<YourClassType>::value must be false, as YourClassType is not a fundamental type, as defined in https://eel.is/c++draft/basic.fundamental#17 . Some traits are just not designed to be customization points. |
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