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.
| 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 |
The length of the maximum initial segment that contains only characters from wide string pointed to by src.
#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'; // 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 ".
| returns the length of the maximum initial segment that consists of only the wide not found in another wide string (function) |
|
| finds the first location of any wide character in one wide string, in another wide string (function) |
|
C documentation for wcsspn |
|
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/string/wide/wcsspn