std::char_traits<CharT>::compare

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

basic_string_view (C++17)

char_traits

 

std::char_traits

Member functions

char_traits::assign

char_traits::eqchar_traits::lt

char_traits::move

char_traits::copy

char_traits::compare

char_traits::length

char_traits::find

char_traits::to_char_type

char_traits::to_int_type

char_traits::eq_int_type

char_traits::eof

char_traits::not_eof

 

static int compare( const char_type* s1, const char_type* s2, std::size_t count );		(until C++17)
static constexpr int compare( const char_type* s1, const char_type* s2, std::size_t count );		(since C++17)

Compares the first count characters of the character strings s1 and s2. The comparison is done lexicographically.

If count is zero, strings are considered equal.

Parameters

s1, s2	-	pointers to character strings to compare
count	-	the number of characters to compare from each character string

Return value

Negative value if s1 is less than s2.

​0​ if s1 is equal to s2.

Positive value if s1 is greater than s2.

Exceptions

(none)

Complexity

Linear in count.