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std::basic_stringbuf::str - cppreference.com

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`std::basic_string<CharT, Traits, Allocator> str() const;`	(1)

`void str( const std::basic_string<CharT, Traits, Allocator>& s);`	(2)

Obtém e define a seqüência subjacente.

Original:

Gets and sets the underlying string.

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1)

Cria e retorna um objeto std::basic_string contendo uma cópia da seqüência esta std::basic_stringbuf caráter subjacente. Para a entrada somente de fluxos, a string retornada contém os personagens do [eback(), egptr()) alcance. Para fluxos de entrada / saída ou saída-somente, contém os caracteres de pbase() para o último caractere na seqüência, independentemente da egptr() e epptr().

Original:

Creates and returns a std::basic_string object containing a copy of this std::basic_stringbuf's underlying character sequence. For input-only streams, the returned string contains the characters from the range [eback(), egptr()). For input/output or output-only streams, contains the characters from pbase() to the last character in the sequence regardless of egptr() and epptr().

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2)

Exclui a seqüência de caracteres inteiro subjacente a este std::basic_stringbuf e depois configura uma seqüência nova personagem subjacente contendo uma cópia do conteúdo do s. Os ponteiros de std::basic_streambuf são inicializados da seguinte forma:

Original:

Deletes the entire underlying character sequence of this std::basic_stringbuf and then configures a new underlying character sequence containing a copy of the contents of s. The pointers of std::basic_streambuf are initialized as follows:

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Para fluxos de entrada (mode & ios_base::in == true), eback() pontos no primeiro caractere, gptr() == eback(), e egptr() == eback() + s.size(): a entrada posterior vai ler o primeiro caractere copiado de s.

Original:

For input streams (mode & ios_base::in == true), eback() points at the first character, gptr() == eback(), and egptr() == eback() + s.size(): the subsequent input will read the first character copied from s.

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Para fluxos de saída (mode & ios_base::out == true), pbase() pontos no primeiro caractere e epptr() >= pbase() + s.size() (epptr é permitido apontar mais para que o sputc() seguinte não chamar imediatamente overflow())

Original:

For output streams (mode & ios_base::out == true), pbase() points at the first character and epptr() >= pbase() + s.size() (epptr is allowed to point farther so that the following sputc() wouldn't immediately call overflow())

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Para fluxos de acréscimo (mode & ios_base::ate == true), pptr() == pbase() + s.size(), de modo que a saída subseqüente será anexado ao último caractere copiado de s (desde C++11)

Original:

For append streams (mode & ios_base::ate == true), pptr() == pbase() + s.size(), so that subsequent output will be appended to the last character copied from s (desde C++11)

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Para não-anexação fluxos de saída, pptr() == pbase(), de modo que a saída subseqüente irá substituir os personagens copiados de s.

Original:

For no-appending output streams, pptr() == pbase(), so that subsequent output will overwrite the characters copied from s.

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Parâmetros

s

-

um objeto string com a seqüência de caracteres de substituição

Original:

a string object holding the replacement character sequence

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Valor de retorno

1)

Um objeto string com uma cópia da seqüência este buffer de caráter subjacente.

Original:

A string object holding a copy of this buffer's underlying character sequence.

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2)

(Nenhum)

Original:

(none)

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Notas

Esta função é geralmente acessada através std::basic_stringstream::str().

Original:

This function is typically accessed through std::basic_stringstream::str().

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Exemplo

#include <sstream>
#include <iostream>
int main()
{
    int n;

    std::istringstream in;  // could also use in("1 2")
    in.rdbuf()->str("1 2"); // set the get area
    in >> n;
    std::cout << "after reading the first int from \"1 2\", the int is " 
              << n << ", str() = \"" << in.rdbuf()->str() << "\"\n"; // or in.str()

    std::ostringstream out("1 2");
    out << 3;
    std::cout << "after writing the int '3' to output stream \"1 2\""
              << ", str() = \"" << out.str() << "\"\n";

    std::ostringstream ate("1 2", std::ios_base::ate); // C++11
    ate << 3;
    std::cout << "after writing the int '3' to append stream \"1 2\""
              << ", str() = \"" << ate.str() << "\"\n";
}

Saída:

after reading the first int from "1 2", the int is 1, str() = "1 2"
after writing the int '3' to output stream "1 2", str() = "3 2"
after writing the int '3' to append stream "1 2", str() = "1 23"

Veja também


	Obtém ou define o conteúdo do objeto subjacente corda dispositivo Original: gets or sets the contents of underlying string device object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (of `std::basic_stringstream` função pública membro) [edit]