std::wcsspn
From cppreference.com
| Defined in header <cwchar>
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| size_t wcsspn( const wchar_t* dest, const wchar_t* src ); |
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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.
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[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'; // 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) | |
| finds the first location of any wide character in one wide string, in another wide string (function) | |
| C documentation for wcsspn
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