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Difference between revisions of "cpp/string/wide/wcsspn"

From cppreference.com
< cpp‎ | string‎ | wide
m (Text replace - "char *" to "wchar_t *")
m ({{c}}, .)
 
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{{cpp/title| wcsspn}}
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{{cpp/title|wcsspn}}
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{{cpp/string/wide/sidebar}}
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{{cpp/string/wide/navbar}}
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{{ddcl | header=cstring |
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{{ddcl|header=cwchar|
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size_t strspn( const wchar_t *dest, const wchar_t *src );
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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 character string pointed to by {{tt|dest}}, that consists of only the characters found in character string pointed to by {{tt|src}}.
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Returns the length of the maximum initial segment of the wide string pointed to by {{c|dest}}, that consists of only the characters found in wide string pointed to by {{c|src}}.
  
 
===Parameters===
 
===Parameters===
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{{param list begin}}
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{{par begin}}
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{{param list item | dest | pointer to the null-terminated character string to be analyzed}}
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{{par|dest|pointer to the null-terminated wide string to be analyzed}}
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{{param list item | src | pointer to the null-terminated character string that contains the characters to search for}}
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{{par|src|pointer to the null-terminated wide string that contains the characters to search for}}
−
{{param list end}}
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{{par end}}
  
 
===Return value===
 
===Return value===
−
 
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The length of the maximum initial segment that contains only characters from wide string pointed to by {{c|src}}.
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the length of the maximum initial segment that contains only characters from character string pointed to by {{tt|src}}
+
  
 
===Example===
 
===Example===
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{{example cpp
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{{example
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|
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|code=
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| code=
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#include <cwchar>
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| output=
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#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";
 +
}
 +
|p=true <!-- gcc may not print hieroglyphs, while clang does -->
 +
|output=
 +
The length of maximum initial segment is 6.
 +
The segment is "白猫 黑狗 ".
 
}}
 
}}
  
 
===See also===
 
===See also===
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{{dcl list begin}}
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{{dsc begin}}
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{{dcl list template | cpp/string/wide/dcl list wcscspn}}
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{{dsc inc|cpp/string/wide/dsc wcscspn}}
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{{dcl list template | cpp/string/wide/dcl list wcspbrk}}
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{{dsc inc|cpp/string/wide/dsc wcspbrk}}
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{{dcl list end}}
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{{dsc see c|c/string/wide/wcsspn}}
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{{dsc end}}
 +
 
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 10:19, 10 June 2023

 
C++
 
Strings library
 
Null-terminated wide strings
 
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.

Contents

[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) [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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