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std::is_reference

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Defined in header <type_traits>
template< class T >
struct is_reference;
 (since C++11)

std::is_reference is a UnaryTypeTrait.

If T is a reference type (lvalue reference or rvalue reference), provides the member constant value equal true. For any other type, value is false.

If the program adds specializations for std::is_reference or std::is_reference_v, the behavior is undefined.

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