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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)

Obtiene y establece la cadena subyacente .

Original:

Gets and sets the underlying string.

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1)

Crea y devuelve un objeto std::basic_string que contiene una copia de esta secuencia de caracteres std::basic_stringbuf subyacente. Por sólo corrientes de entrada-, la cadena devuelta contiene los caracteres de la [eback(), egptr()) rango. Para los flujos de entrada / salida o sólo de salida, contiene los caracteres de pbase() al último carácter de la secuencia, independientemente de egptr() y 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)

Elimina toda la secuencia de caracteres subyacente de esta std::basic_stringbuf y configura una nueva secuencia de caracteres subyacente que contiene una copia de los contenidos de s. Los punteros de std::basic_streambuf se inicializan como sigue:

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 los flujos de entrada (mode & ios_base::in == true), eback() puntos en el primer carácter, gptr() == eback() y egptr() == eback() + s.size(): la entrada posterior se lee el primer carácter 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 flujos de salida (mode & ios_base::out == true), pbase() puntos en el primer carácter y epptr() >= pbase() + s.size() (epptr se le permite apuntar más lejos para que la siguiente no sputc() inmediatamente llamaría 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 flujos de datos anexados (mode & ios_base::ate == true), pptr() == pbase() + s.size(), por lo que la producción posterior se añadirá al último carácter 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 los no-anexando los flujos de salida, pptr() == pbase(), por lo que la producción posterior se sobreponen a los personajes 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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Parámetros

s -

un objeto de cadena que contiene la secuencia de caracteres de sustitución

Original:

a string object holding the replacement character sequence

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Valor de retorno

1)

Un objeto de cadena que contiene una copia de la secuencia de este búfer de caracteres subyacente .

Original:

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

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2)

(Ninguno)

Original:

(none)

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Notas

Esta función se suele acceder a través de std::basic_stringstream::str() .

Original:

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

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Ejemplo

#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";
}

Salida: 

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"

Ver también

obtiene o establece el contenido del objeto subyacente dispositivo cadena

Original:

gets or sets the contents of underlying string device object

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(función miembro pública de std::basic_stringstream) [editar]