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std::basic_string::npos

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< cpp‎ | string‎ | basic string

 
 
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Null-terminated strings
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Constantes
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basic_string::npos
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(C++11)
 
static const size_type npos = -1;
Este es un valor especial igual al valor máximo representable por la size_type tipo. El significado exacto depende del contexto, pero en general se utiliza ya sea como indicador de fin de cadena por las funciones que esperan un índice de cadena o como el indicador de error de las funciones que devuelven un índice de cadena .
Original:
This is a special value equal to the maximum value representable by the type size_type. The exact meaning depends on context, but it is generally used either as end of string indicator by the functions that expect a string index or as the error indicator by the functions that return a string index.
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[editar] Ejemplo

#include <iostream>
#include <bitset>
#include <string>
 
int main()
{
    // string search functions return npos if nothing is found
    std::string s = "test";
    if(s.find('a') == std::string::npos)
        std::cout << "no 'a' in 'test'\n";
 
    // functions that take string subsets as arguments 
    // use npos as the "all the way to the end" indicator
    std::string s2(s, 2, std::string::npos);
    std::cout << s2 << '\n';
 
    std::bitset<5> b("aaabb", std::string::npos, 'a', 'b');
    std::cout << b << '\n';
}

Output:

no 'a' in 'test'
st
00011