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              header

              <type_traits>

              type_traits
              This header defines a series of classes to obtain type information on compile-time.

              The header contains:
              • Helper classes: Standard classes to assist in creating compile-time constants.
              • Type traits: Classes to obtain characteristics of types in the form of compile-time constant values.
              • Type transformations: Classes to obtain new types by applying specific transformations to existing types.

              A basic trait for types is the categories in which they can be classified. This is a chart on how these categories overlap:
              primary categoriescomposite categories
              fundamentalvoid
              std::nullptr_tscalarobject
              integralarithmetic
              floating point
              compoundpointer
              member object pointermember pointer
              member function pointer
              enum
              union
              class*
              array
              l-value referencereference
              r-value reference
              function
              * = excluding unions

              Helper classes


              Type traits

              Primary type categories


              Composite type categories


              Type properties


              Type features


              Type relationships


              Property queries



              Type transformations

              Const-volatile qualifications


              Compound type alterations


              Other type generators

              <type_traits>

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