std::tuple_cat

 

C++

语言

概念

实用工具库

字符串库

集装箱库

算法库

迭代器库

Numerics库

输入/输出库

本地化库

正则表达式库 （C++11）

原子操作库 （C++11）

线程的支持库 （C++11）

 

实用工具库

类型的支持 (basic types, RTTI, type traits)

动态内存管理

错误处理

程序实用工具

可变参数函数

日期和时间

函数对象

initializer_list （C++11）

bitset

hash （C++11）

关系运算符 Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

双和元组 Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple （C++11）

piecewise_construct_t （C++11）

piecewise_construct （C++11）

掉期，远期和移动 Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward （C++11）

move （C++11）

move_if_noexcept （C++11）

declval （C++11）

 

std::tuple

成员函数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple::tuple

tuple::operator=

tuple::swap

非成员函数 Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_tuple

tie

forward_as_tuple

None

operator= operator!= operator< operator<= operator> operator>=

std::swap

get

Helper类 Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

tuple_element

uses_allocator

ignore

 

Defined in header <tuple>
template< class... Tuples > tuple<CTypes...> tuple_cat(Tuples&&... args);		（C++11 起）

构造一个元组，这是一个串联的所有元组args.

Original:

Constructs a tuple that is a concatenation of all tuples in args.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

参数

args

-

零个或多个元组连接起来 Original: zero or more tuples to concatenate The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

从std::tuple每个元素的所有参数的元组的所有元素组成一个std::get<i>(std::forward<Ti>(arg))对象.

Original:

A std::tuple object composed of all elements of all argument tuples constructed from std::get<i>(std::forward<Ti>(arg)) for each individual element.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

为例

#include <iostream>
#include <tuple>
#include <string>
 
// helper function to print a tuple of any size
template<class Tuple, std::size_t N>
struct TuplePrinter {
    static void print(const Tuple& t)
    {
        TuplePrinter<Tuple, N-1>::print(t);
        std::cout << ", " << std::get<N-1>(t);
    }
};
 
template<class Tuple>
struct TuplePrinter<Tuple, 1> {
    static void print(const Tuple& t)
    {
        std::cout << std::get<0>(t);
    }
};
 
template<class... Args>
void print(const std::tuple<Args...>& t)
{
    std::cout << "(";
    TuplePrinter<decltype(t), sizeof...(Args)>::print(t);
    std::cout << ")\n";
}
// end helper function
 
int main()
{
    std::tuple<int, std::string, float> t1(10, "Test", 3.14);
    int n = 7;
    auto t2 = std::tuple_cat(t1, std::make_pair("Foo", "bar"), t1, std::tie(n));
    n = 10;
    print(t2);
}

Output:

(10, Test, 3.14, Foo, bar, 10, Test, 3.14, 10)

make_tuple	创建一个tuple对象的参数类型定义的类型 Original: creates a tuple object of the type defined by the argument types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
tie	创建一个tuple的左值引用或解压缩到单个对象的元组 Original: creates a tuple of lvalue references or unpacks a tuple into individual objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
forward_as_tuple	创建一个tuple的右值引用 Original: creates a tuple of rvalue references The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）