std::basic_string::substr

 

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basic_string substr( size_type pos =0,                      size_type count = npos );

Retorna uma substring [pos, pos+count). Se a substring solicitado dura após o final da cadeia, ou se count == npos, a substring retornada é [pos, size()).

Original:

Returns a substring [pos, pos+count). If the requested substring lasts past the end of the string, or if count == npos, the returned substring is [pos, size()).

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Parâmetros

pos	-	posição do primeiro caractere a incluir Original: position of the first character to include The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	comprimento da substring Original: length of the substring The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

String contendo o [pos, pos+count) substring.

Original:

String containing the substring [pos, pos+count).

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Exceções

std::out_of_range if pos > size().

Complexidade

Linear em count

Original:

Linear in count

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Exemplo

#include <string>#include <iostream>   int main(){std::string a ="0123456789abcdefghij";   std::string sub1 = a.substr(10);std::cout<< sub1 <<'\n';   std::string sub2 = a.substr(5, 3);std::cout<< sub2 <<'\n';   std::string sub3 = a.substr(12, 100);std::cout<< sub3 <<'\n';}

Saída:

abcdefghij 567 cdefghij

Veja também

copy	cópias personagens Original: copies characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro)