20 General utilities library [utilities]

20.9 Metaprogramming and type traits [meta]

20.9.4 Unary type traits [meta.unary] Composite type traits [meta.unary.comp]

These templates provide convenient compositions of the primary type categories, corresponding to the descriptions given in section [basic.types].

For any given type T, the result of applying one of these templates to T, and to cv-qualified T shall yield the same result.

Table 48 — Composite type category predicates
template <class T>
struct is_reference;
T is an lvalue reference or an rvalue reference
template <class T>
struct is_arithmetic;
T is an arithmetic type ([basic.fundamental])
template <class T>
struct is_fundamental;
T is a fundamental type ([basic.fundamental])
template <class T>
struct is_object;
T is an object type ([basic.types])
template <class T>
struct is_scalar;
T is a scalar type ([basic.types])
template <class T>
struct is_compound;
T is a compound type ([basic.compound])
template <class T>
struct is_member_pointer;
T is a pointer to non-static data member or non-static member function