...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
template <class T>
struct is_scalar : public true_type-or-false_type
{};
Inherits: If T is a (possibly cv-qualified) scalar type then inherits from true_type, otherwise inherits from false_type. Scalar types include integral, floating point, enumeration, pointer, and pointer-to-member types.
C++ Standard Reference: 3.9p10.
Header: #include
<boost/type_traits/is_scalar.hpp>
or #include <boost/type_traits.hpp>
Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template can not be used with function types.
Examples:
is_scalar<int*>
inherits fromtrue_type
.
is_scalar<int>::type
is the typetrue_type
.
is_scalar<double>::value
is an integral constant expression that evaluates to true.
is_scalar<int (*)(long)>::value
is an integral constant expression that evaluates to true.
is_scalar<int (MyClass::*)(long)>::value
is an integral constant expression that evaluates to true.
is_scalar<int (MyClass::*)>::value
is an integral constant expression that evaluates to true.
is_scalar<T>::value_type
is the typebool
.