operator==,!=,<,<=,>,>=(std::experimental::basic_string_view)

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_typeexperimental::raw_invocation_type

experimental::search

experimental::default_searcherexperimental::make_default_searcher

experimental::boyer_moore_searcherexperimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcherexperimental::make_boyer_moore_horspool_searcher

Type-erased and polymorphic allocators

Variable templates for type traits

 

std::experimental::basic_string_view

Member functions basic_string_view::basic_string_view basic_string_view::operator= Iterators basic_string_view::beginbasic_string_view::cbegin basic_string_view::endbasic_string_view::cend basic_string_view::rbeginbasic_string_view::crbegin basic_string_view::rendbasic_string_view::crend Element access basic_string_view::at basic_string_view::operator[] basic_string_view::front basic_string_view::back basic_string_view::data Capacity basic_string_view::sizebasic_string_view::length basic_string_view::max_size basic_string_view::empty Modifiers basic_string_view::remove_prefix basic_string_view::remove_suffix basic_string_view::swap

Operations basic_string_view::to_stringbasic_string_view::operator basic_string basic_string_view::copy basic_string_view::substr basic_string_view::compare basic_string_view::find basic_string_view::rfind basic_string_view::find_first_of basic_string_view::find_last_of basic_string_view::find_first_not_of basic_string_view::find_last_not_of Constants basic_string_view::npos Non-member functions operator==operator!=operator<operator>operator<=operator>= operator<< Helper classes hash<std::string_view>hash<std::wstring_view>hash<std::u16string_view>hash<std::u32string_view>

 

Defined in header <experimental/string_view>
Compare two basic_string_view objects
template< class CharT, class Traits > constexpr bool operator==( basic_string_view <CharT,Traits> lhs,                            basic_string_view <CharT,Traits> rhs ) noexcept;	(1)	(library fundamentals TS)
template< class CharT, class Traits > constexpr bool operator!=( basic_string_view <CharT,Traits> lhs,                            basic_string_view <CharT,Traits> rhs ) noexcept;	(2)	(library fundamentals TS)
template< class CharT, class Traits > constexpr bool operator<( basic_string_view <CharT,Traits> lhs,                           basic_string_view <CharT,Traits> rhs ) noexcept;	(3)	(library fundamentals TS)
template< class CharT, class Traits > constexpr bool operator<=( basic_string_view <CharT,Traits> lhs,                            basic_string_view <CharT,Traits> rhs ) noexcept;	(4)	(library fundamentals TS)
template< class CharT, class Traits > constexpr bool operator>( basic_string_view <CharT,Traits> lhs,                           basic_string_view <CharT,Traits> rhs ) noexcept;	(5)	(library fundamentals TS)
template< class CharT, class Traits > constexpr bool operator>=( basic_string_view <CharT,Traits> lhs,                            basic_string_view <CharT,Traits> rhs ) noexcept;	(6)	(library fundamentals TS)

Compares two views.

All comparisons are done via the compare() member function (which itself is defined in terms of Traits::compare()):

• Two views are equal if both the size of lhs and rhs are equal and each character in lhs has an equivalent character in rhs at the same position.

• The ordering comparisons are done lexicographically -- the comparison is performed by a function equivalent to std::lexicographical_compare.

The implementation shall provide sufficient additional constexpr and noexcept overloads of these functions so that a basic_string_view<CharT,Traits> object sv may be compared to another object t with an implicit conversion to basic_string_view<CharT,Traits>, with semantics identical to comparing sv and basic_string_view<CharT,Traits>(t).

Parameters

lhs, rhs

-

views to compare

Return value

true if the corresponding comparison holds, false otherwise.

Complexity

Linear in the size of the views.

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