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std::tuple

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< cpp‎ | utility


 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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tuple
(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
std::tuple
Las funciones miembro
Original:
Member functions
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Terceros funciones
Original:
Non-member functions
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Clases de ayuda
Original:
Helper classes
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Definido en la cabecera <tuple>
template< class... Types >
class tuple;
(desde C++11)
std::tuple clase de plantilla es una colección de tamaño fijo de valores heterogéneos. Es una generalización de std::pair .
Original:
Class template std::tuple is a fixed-size collection of heterogeneous values. It is a generalization of std::pair.
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Contenido

[editar] Las funciones miembro

construye una nueva tuple
Original:
constructs a new tuple
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(función miembro público)
asigna el contenido de un tuple a otro
Original:
assigns the contents of one tuple to another
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(función miembro público)
Intercambia el contenido de dos tuples
Original:
swaps the contents of two tuples
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(función miembro público)

[editar] Terceros funciones

crea un objeto tuple del tipo definido por los tipos de argumentos
Original:
creates a tuple object of the type defined by the argument types
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(plantilla de función) [editar]
crea una tuple de referencias lvalue o desempaqueta una tupla en objetos individuales
Original:
creates a tuple of lvalue references or unpacks a tuple into individual objects
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(plantilla de función) [editar]
crea un tuple de referencias rvalue
Original:
creates a tuple of rvalue references
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(plantilla de función) [editar]
crea un tuple mediante la concatenación de cualquier número de tuplas
Original:
creates a tuple by concatenating any number of tuples
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(plantilla de función) [editar]
accesos a tuplas elemento especificado
Original:
tuple accesses specified element
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(plantilla de función) [editar]
lexicográficamente compara los valores de la tupla
Original:
lexicographically compares the values in the tuple
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(plantilla de función) [editar]
el algoritmo se especializa std::swap
Original:
specializes the std::swap algorithm
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(plantilla de función) [editar]

[editar] Clases de ayuda

obtiene el tamaño de tuple en tiempo de compilación
Original:
obtains the size of tuple at compile time
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(especialización de plantilla de clase) [editar]
se obtiene el tipo del elemento especificado
Original:
obtains the type of the specified element
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(especialización de plantilla de clase) [editar]
se especializa el rasgo tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(especialización de plantilla de clase) [editar]
marcador de posición para saltar de un elemento cuando se descomprimen usando un tuple tie
Original:
placeholder to skip an element when unpacking a tuple using tie
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(constante) [editar]

[editar] Ejemplo

#include <tuple>
#include <iostream>
#include <string>
#include <stdexcept>
 
std::tuple<double, char, std::string> get_student(int id)
{
    if (id == 0) return std::make_tuple(3.8, 'A', "Lisa Simpson");
    if (id == 1) return std::make_tuple(2.9, 'C', "Milhouse Van Houten");
    if (id == 2) return std::make_tuple(1.7, 'D', "Ralph Wiggum");
    throw std::invalid_argument("id");
}
 
int main()
{
    auto student0 = get_student(0);
    std::cout << "ID: 0, "
              << "GPA: " << std::get<0>(student0) << ", "
              << "grade: " << std::get<1>(student0) << ", "
              << "name: " << std::get<2>(student0) << '\n';
 
    double gpa1;
    char grade1;
    std::string name1;
    std::tie(gpa1, grade1, name1) = get_student(1);
    std::cout << "ID: 1, "
              << "GPA: " << gpa1 << ", "
              << "grade: " << grade1 << ", "
              << "name: " << name1 << '\n';
}

Salida:

ID: 0, GPA: 3.8, grade: A, name: Lisa Simpson
ID: 1, GPA: 2.9, grade: C, name: Milhouse Van Houten