std::char_traits::compare (3) Linux Manual Page

std::char_traits<CharT>::compare – std::char_traits<CharT>::compare

Synopsis

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.