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std::basic_string::find - cppreference.com

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size_type find( const basic_string& str, size_type pos = 0 ) const;

 (1)

size_type find( const CharT* s, size_type pos, size_type count ) const;

 (2)

size_type find( const CharT* s, size_type pos = 0 ) const;

 (3)

size_type find( CharT ch, size_type pos = 0 ) const;

 (4)

Encontra a primeira substring igual a seqüência de caracteres. Pesquisa começa na pos, ou seja, a substring encontrada não deve começar em uma posição anterior pos.

Original:

Finds the first substring equal to the given character sequence. Search begins at pos, i.e. the found substring must not begin in a position preceding pos.

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1)

Encontra a primeira substring igual a str.

Original:

Finds the first substring equal to str.

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2)

Encontra a primeira substring iguais aos caracteres count primeiro da cadeia de caracteres apontada por s. s pode incluir caracteres nulos.

Original:

Finds the first substring equal to the first count characters of the character string pointed to by s. s can include null characters.

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3)

Encontra a primeira substring igual à cadeia de caracteres apontada por s. O comprimento da corda é determinada pelo primeiro caractere nulo.

Original:

Finds the first substring equal to the character string pointed to by s. The length of the string is determined by the first null character.

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4)

Localiza o ch primeiro caractere.

Original:

Finds the first character ch.

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Parâmetros

str -

string para procurar

Original:

string to search for

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count -

comprimento da substring a ser pesquisada

Original:

length of substring to search for

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s -

ponteiro para uma cadeia de caracteres de pesquisa para a

Original:

pointer to a character string to seach for

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ch -

caracteres para pesquisa

Original:

character to search for

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Valor de retorno

posição do primeiro caractere da substring encontrado ou se não npos substring seja encontrado.

Original:

position of the first character of the found substring or npos if no such substring is found.

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Exemplo

#include <string>
#include <iostream>

void print(std::string::size_type n, std::string const &s)
{
    if (n == std::string::npos) {
        std::cout << "not found\n";
    } else {
        std::cout << "found: " << s.substr(n) << '\n';
    }
}

int main()
{
    std::string::size_type n;
    std::string const s = "This is a string";

    // search from beginning of string
    n = s.find("is");
    print(n, s);

    // search from position 5
    n = s.find("is", 5);
    print(n, s);

    // find a single character
    n = s.find('a');
    print(n, s);

    // find a single character
    n = s.find('q');
    print(n, s);
}

Saída: 

found: is is a string
found: is a string
found: a string
not found

Veja também

encontrar a última ocorrência de uma substring

Original:

find the last occurrence of a substring

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(função pública membro) [edit]

encontrar a primeira ocorrência de caracteres

Original:

find first occurrence of 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) [edit]

encontrar primeira ausência de caracteres

Original:

find first absence of characters

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(função pública membro) [edit]

encontrar última ocorrência de caracteres

Original:

find last occurrence of 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) [edit]

encontrar ausência de última caracteres

Original:

find last absence of characters

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(função pública membro) [edit]