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std::wcsspn

From cppreference.com
< cpp‎ | string‎ | wide
 
 
 
 
Defined in header <cwchar>
size_t wcsspn( const wchar_t* dest, const wchar_t* src );

Returns the length of the maximum initial segment of the wide string pointed to by dest, that consists of only the characters found in wide string pointed to by src.

[edit] Parameters

dest - pointer to the null-terminated wide string to be analyzed
src - pointer to the null-terminated wide string that contains the characters to search for

[edit] Return value

The length of the maximum initial segment that contains only characters from wide string pointed to by src.

[edit] Example

Run this code
#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
 wchar_t dest[] = L"白猫 黑狗 甲虫";
 const wchar_t src[] = L" 狗猫 白黑 ";
 const std::size_t len = std::wcsspn(dest, src);
 dest[len] = L'0円'; // terminates the segment to print it out
 
 std::wcout.imbue(std::locale ("en_US.utf8"));
 std::wcout << L"The length of maximum initial segment is " << len << L".\n";
 std::wcout << L"The segment is \"" << dest << L"\".\n";
}

Possible output:

The length of maximum initial segment is 6.
The segment is "白猫 黑狗 ".

[edit] See also

returns the length of the maximum initial segment that consists
of only the wide not found in another wide string
(function) [edit]
finds the first location of any wide character in one wide string, in another wide string
(function) [edit]
C documentation for wcsspn
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