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Type Traits.

#include <boost/tr1/type_traits.hpp>

or

#include <type_traits>

Type traits enable generic code to access the fundamental properties of a type, to determine the relationship between two types, or to transform one type into another related type. For more information refer to the Boost.Type_traits documentation.

namespace std {
namespace tr1 {

template <class T, T v> struct integral_constant;

typedef integral_constant<bool, true> true_type;
typedef integral_constant<bool, false> false_type;

// [4.5.1] primary type categories:
template <class T> struct is_void;
template <class T> struct is_integral;
template <class T> struct is_floating_point;
template <class T> struct is_array;
template <class T> struct is_pointer;
template <class T> struct is_reference;
template <class T> struct is_member_object_pointer;
template <class T> struct is_member_function_pointer;
template <class T> struct is_enum;
template <class T> struct is_union;
template <class T> struct is_class;
template <class T> struct is_function;

// [4.5.2] composite type categories:
template <class T> struct is_arithmetic;
template <class T> struct is_fundamental;
template <class T> struct is_object;
template <class T> struct is_scalar;
template <class T> struct is_compound;
template <class T> struct is_member_pointer;

// [4.5.3] type properties:
template <class T> struct is_const;
template <class T> struct is_volatile;
template <class T> struct is_pod;
template <class T> struct is_empty;
template <class T> struct is_polymorphic;
template <class T> struct is_abstract;
template <class T> struct has_trivial_constructor;
template <class T> struct has_trivial_copy;
template <class T> struct has_trivial_assign;
template <class T> struct has_trivial_destructor;
template <class T> struct has_nothrow_constructor;
template <class T> struct has_nothrow_copy;
template <class T> struct has_nothrow_assign;
template <class T> struct has_virtual_destructor;
template <class T> struct is_signed;
template <class T> struct is_unsigned;
template <class T> struct alignment_of;
template <class T> struct rank;
template <class T, unsigned I = 0> struct extent;

// [4.6] type relations:
template <class T, class U> struct is_same;
template <class Base, class Derived> struct is_base_of;
template <class From, class To> struct is_convertible;

// [4.7.1] const-volatile modifications:
template <class T> struct remove_const;
template <class T> struct remove_volatile;
template <class T> struct remove_cv;
template <class T> struct add_const;
template <class T> struct add_volatile;
template <class T> struct add_cv;

// [4.7.2] reference modifications:
template <class T> struct remove_reference;
template <class T> struct add_reference;

// [4.7.3] array modifications:
template <class T> struct remove_extent;
template <class T> struct remove_all_extents;

// [4.7.4] pointer modifications:
template <class T> struct remove_pointer;
template <class T> struct add_pointer;

// [4.8] other transformations:
template <std::size_t Len, std::size_t Align> struct aligned_storage;

} // namespace tr1
} // namespace std

Configuration: Boost.Config should (automatically) define the macro BOOST_HAS_TR1_TYPE_TRAITS if your standard library implements this part of TR1.

Standard Conformity: No known problems.


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