| Localization library | |||||||||||||||||||||||||
| Regular expressions library(C++11) | |||||||||||||||||||||||||
| Formatting library(C++20) | |||||||||||||||||||||||||
| Null-terminated sequence utilities | |||||||||||||||||||||||||
| Byte strings | |||||||||||||||||||||||||
| Multibyte strings | |||||||||||||||||||||||||
| Wide strings | |||||||||||||||||||||||||
| Primitive numeric conversions | |||||||||||||||||||||||||
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| Text encoding identifications | |||||||||||||||||||||||||
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| Functions | ||||||||||||||||||||||||||||||||||||
| Character classification | ||||||||||||||||||||||||||||||||||||
| Character manipulation | ||||||||||||||||||||||||||||||||||||
| Conversions to numeric formats | ||||||||||||||||||||||||||||||||||||
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| String manipulation | ||||||||||||||||||||||||||||||||||||
| String examination | ||||||||||||||||||||||||||||||||||||
| Character array functions | ||||||||||||||||||||||||||||||||||||
| Miscellaneous | ||||||||||||||||||||||||||||||||||||
Defined in header <cstring> | ||
size_t strspn(constchar* dest,constchar* src); | ||
Returns the length of the maximum initial segment (span) of the byte string pointed to bydest, that consists of only the characters found in byte string pointed to bysrc.
Contents |
| dest | - | pointer to the null-terminated byte string to be analyzed |
| src | - | pointer to the null-terminated byte string that contains the characters to search for |
The length of the maximum initial segment that contains only characters from byte string pointed to bysrc.
#include <cstring>#include <iostream>#include <string> constchar* low_alpha="qwertyuiopasdfghjklzxcvbnm"; int main(){std::string s="abcde312$#@"; std::size_t spnsz= std::strspn(s.c_str(), low_alpha);std::cout<<"After skipping initial lowercase letters from '"<< s<<"'\nThe remainder is '"<< s.substr(spnsz)<<"'\n";}
Output:
After skipping initial lowercase letters from 'abcde312$#@'The remainder is '312$#@'
| returns the length of the maximum initial segment that consists of only the characters not found in another byte string (function)[edit] | |
| returns the length of the maximum initial segment that consists of only the wide characters found in another wide string (function)[edit] | |
| finds the first location of any character from a set of separators (function)[edit] | |
C documentation forstrspn | |
