std::type_index::operator==,!=,<,<=,>,>=,<=>

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Dynamic memory management Program utilities Coroutine support (C++20) Variadic functions is_constant_evaluated (C++20) launder (C++17) initializer_list (C++11) source_location (C++20) Three-way comparison (C++20) three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)    is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

General utilities Date and time Function objects Formatting library (C++20) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)    cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17)

 

Type support

Basic types
Fixed width integer types (C++11)
ptrdiff_t size_t max_align_t (C++11) byte (C++17)	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

 

std::type_index

Member functions

type_index::type_index (C++11)

type_index::operator=type_index::operator!=type_index::operator<type_index::operator<=type_index::operator>type_index::operator>=type_index::operator<=> (C++11)(C++11)(until C++20)(C++11)(C++11)(C++11)(C++11)(C++20)

type_index::hash_code (C++11)

type_index::name (C++11)

Helper classes

hash<std::type_index> (C++11)

 

bool operator==( const type_index& rhs ) const noexcept;	(1)	(since C++11)
bool operator!=( const type_index& rhs ) const noexcept;	(2)	(since C++11) (until C++20)
bool operator<( const type_index& rhs ) const noexcept;	(3)	(since C++11)
bool operator<=( const type_index& rhs ) const noexcept;	(4)	(since C++11)
bool operator>( const type_index& rhs ) const noexcept;	(5)	(since C++11)
bool operator>=( const type_index& rhs ) const noexcept;	(6)	(since C++11)
std::strong_ordering operator<=>( const type_index& rhs ) const noexcept;	(7)	(since C++20)

Compares the underlying std::type_info objects.

1-2) Checks whether the underlying std::type_info objects refer to the same type.

3-7) Compares the underlying std::type_info objects as defined by an implementation-defined ordering. The comparison is done by type_info::before.

The != operator is synthesized from operator==.

(since C++20)

Parameters

rhs

-

another type_index object to compare to

Return value

1) true if the underlying std::type_info objects refer to the same type, false otherwise

2) true if the underlying std::type_info objects refer not to the same type, false otherwise

3-6) true if the types referred by the underlying std::type_info objects are ordered by corresponding order, false otherwise.

7) std::strong_ordering::equal if the underlying std::type_info objects refer to the same type, otherwise std::strong_ordering::less if *this's underlying std::type_info object precedes rhs's in the implementation-defined ordering, otherwise std::strong_ordering::greater.