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std::regex_traits<CharT>::length

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static std::size_t length( const char_type* p );

Calculates the length of a null-terminated character sequence, that is, the smallest i such that p[i] == 0.

Standard library specializations of std::regex_traits execute std::char_traits <CharT>::length(p);.

[edit] Parameters

p - pointer to the first element of the null-terminated character sequence

[edit] Return value

The length of the null-terminated character string.

[edit] Example

Run this code
#include <iostream>
#include <regex>
 
int main()
{
 std::cout << std::regex_traits <char>::length("Кошка") << '\n'
 << std::regex_traits <wchar_t>::length(L"Кошка") << '\n';
}

Output:

10
5
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