std::experimental::basic_string_view::compare

 

C++

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Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

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Numerics library

Input/output library

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Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals 2 TS)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Concepts (concepts TS)

Ranges (ranges TS)

Special mathematical functions (special math TR)

 

Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_type experimental::raw_invocation_type

experimental::search

experimental::default_searcher experimental::make_default_searcher

experimental::boyer_moore_searcher experimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcher experimental::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 Modifers 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>

 

constexpr int compare(basic_string_view v) const noexcept;	(1)	(library fundamentals TS)
constexpr int compare(size_type pos1, size_type count1,                       basic_string_view v) const	(2)	(library fundamentals TS)
constexpr int compare(size_type pos1, size_type count1, basic_string_view v,                       size_type pos2, size_type count2) const;	(3)	(library fundamentals TS)
constexpr int compare(const CharT* s) const;	(4)	(library fundamentals TS)
constexpr int compare(size_type pos1, size_type count1,                       const CharT* s) const;	(5)	(library fundamentals TS)
constexpr int compare(size_type pos1, size_type count1,                       const CharT* s, size_type count2) const;	(6)	(library fundamentals TS)

Compares two character sequences.

1) The length rlen of the sequences to compare is the smaller of size() and v.size(). The function compares the two views by calling traits::compare(data(), v.data(), rlen), and returns a value according to the following table:

Condition		Result	Return value
Traits::compare(data(), v.data(), rlen) < 0		this is less than v	<0
Traits::compare(data(), v.data(), rlen) == 0	size() < v.size()	this is less than v	<0
	size() == v.size()	this is equal to v	​0​
	size() > v.size()	this is greater than v	>0
Traits::compare(data(), v.data(), rlen) > 0		this is greater than v	>0

2) Equivalent to substr(pos1, count1).compare(v).

3) Equivalent to substr(pos1, count1).compare(v.substr(pos2, count2)).

4) Equivalent to compare(basic_string_view(s)).

5) Equivalent to substr(pos1, count1).compare(basic_string_view(s)).

6) Equivalent to substr(pos1, count1).compare(basic_string_view(s, count2)).

Parameters

v	-	view to compare
s	-	pointer to the character string to compare to
count1	-	number of characters of this view to compare
pos1	-	position of the first character in this view to compare
count2	-	number of characters of the given view to compare
pos2	-	position of the first character of the given view to compare

Return value

negative value if this view is less than the other character sequence, zero if the both character sequences are equal, positive value if this view is greater than the other character sequence.

Complexity

1) Linear in the number of characters compared.

See also

operator==operator!=operator<operator>operator<=operator>=

lexicographically compares two views (function template)