std::type_index

C++ Reference
Language Concepts Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Utilities library
Type support
Basic types Fundamental types Fixed width integer types (C++11) ptrdiff_t size_t max_align_t (C++11) nullptr_t (C++11) offsetof NULL Numeric limits numeric_limits C numeric limits interface Runtime type information type_info type_index (C++11) bad_typeid bad_cast Type traits Primary type categories is_void (C++11) is_array (C++11) is_pointer (C++11) is_enum (C++11) is_union (C++11) is_class (C++11) is_function (C++11) is_object (C++11) is_scalar (C++11) is_compound (C++11) is_integral (C++11) is_floating_point (C++11) is_fundamental (C++11) is_arithmetic (C++11) is_reference (C++11) is_lvalue_reference (C++11) is_rvalue_reference (C++11) is_member_pointer (C++11) is_member_object_pointer (C++11) is_member_function_pointer (C++11) Type properties is_const (C++11) is_volatile (C++11) is_pod (C++11) is_empty (C++11) is_polymorphic (C++11) is_abstract (C++11) is_trivial (C++11) is_trivially_copyable (C++11) is_standard_layout (C++11) is_literal_type (C++11) is_signed (C++11) is_unsigned (C++11) Supported operations is_constructible is_trivially_constructible is_nothrow_constructible (C++11) (C++11) (C++11) is_default_constructible is_trivially_default_constructible is_nothrow_default_constructible (C++11) (C++11) (C++11) is_copy_constructible is_trivially_copy_constructible is_nothrow_copy_constructible (C++11) (C++11) (C++11) is_move_constructible is_trivially_move_constructible is_nothrow_move_constructible (C++11) (C++11) (C++11) is_assignable is_trivially_assignable is_nothrow_assignable (C++11) (C++11) (C++11) is_copy_assignable is_trivially_copy_assignable is_nothrow_copy_assignable (C++11) (C++11) (C++11) is_move_assignable is_trivially_move_assignable is_nothrow_move_assignable (C++11) (C++11) (C++11) is_destructible is_trivially_destructible is_nothrow_destructible (C++11) (C++11) (C++11) has_virtual_destructor (C++11) Relationships and property queries is_same (C++11) is_base_of (C++11) is_convertible (C++11) alignment_of (C++11) rank (C++11) extent (C++11) Type modifications remove_cv remove_const remove_volatile (C++11) (C++11) (C++11) add_cv add_const add_volatile (C++11) (C++11) (C++11) make_signed (C++11) make_unsigned (C++11) remove_reference (C++11) add_lvalue_reference add_rvalue_reference (C++11) (C++11) remove_pointer (C++11) add_pointer (C++11) remove_extent (C++11) remove_all_extents (C++11) Type transformations aligned_storage (C++11) aligned_union (C++11) decay (C++11) enable_if (C++11) conditional (C++11) common_type (C++11) underlying_type (C++11) result_of (C++11) Type trait constants integral_constant (C++11)
std::type_index
Member functions type_index::type_index type_index::operator= type_index::operator!= type_index::operator< type_index::operator<= type_index::operator> type_index::hash_code type_index::name

Defined in header <typeindex>
class type_index;		(since C++11)

The type_index class is a wrapper class around a std::type_info object, that can be used as index in associative and unordered associative containers. The relationship with type_info object is maintained through a pointer, therefore type_index is CopyConstructible and CopyAssignable.

Member functions

(constructor)	constructs the object (public member function)
operator== operator!= operator< operator<= operator> operator>=	compares the underlying std::type_info objects (public member function)
hash_code	returns hashed code (public member function)
name	returns implementation defined name of the type, associated with underlying type_info object (public member function)

Helper classes

std::hash<std::type_index> (C++11)	hash support for std::type_index (class template specialization)

See also

type_info	contains some type's information, generated by the implementation. This is the class, returned by the typeid operator (class)