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      std::basic_stringbuf::str

      De cppreference.com

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      <metanoindex/>

       
      C++
       
      De entrada / saída da biblioteca
      I / O manipuladores
      C estilo de I / O
      Buffers
      Original:
      Buffers
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      (obsoleta)
      Streams
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      Streams
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      Abstrações
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      Abstractions
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      File I / O
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      File I/O
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      Cordas I / O
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      String I/O
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      Matriz de I / O
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      Array I/O
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      (obsoleta)
      (obsoleta)
      (obsoleta)
      Tipos
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      Types
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      Interface de categoria de erro
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      Error category interface
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      (C++11)
      (C++11)
       
      std::basic_stringbuf
      Membro funções públicas
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      Public member functions
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      basic_stringbuf::basic_stringbuf
      basic_stringbuf::operator=(C++11)
      basic_stringbuf::swap(C++11)
      basic_stringbuf::str
      Protegido funções de membro
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      Protected member functions
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      basic_stringbuf::underflow
      basic_stringbuf::pbackfail
      basic_stringbuf::overflow
      basic_stringbuf::setbuf
      basic_stringbuf::seekoff
      basic_stringbuf::seekpos
      Não-membros funções
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      Non-member functions
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      (C++11)
       
      <tbody> </tbody>
      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)
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      (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
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      (of std::basic_stringstream função pública membro) [edit]