Range-based for loop （C++11 起）

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[编辑] 语法

[编辑] 解释

• (__range)和(__range + __bound)__bound为数组类型，数组绑定

  Original:

  (__range) and (__range + __bound) for array types, where __bound is the array bound

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• begin(__range)和end(__range)，而被发现，参数查找规则的基础上。对于标准的容器结束相当于std::beginstd::end而这又需要__range.begin()和__range.end().

  Original:

  begin(__range) and end(__range), which are found based on argument-lookup rules. For standard containers this ends up being equivalent to std::begin and std::end which in turn calls __range.begin() and __range.end().

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[编辑] 关键字

for

[编辑] 为例

#include <iostream>
#include <vector>
 
int main() 
{
    std::vector<int> v = {0, 1, 2, 3, 4, 5};
 
    for (int &i : v) // access by reference (const allowed)
        std::cout << i << ' ';
 
    std::cout << '\n';
 
    for (auto i : v) // compiler uses type inference to determine the right type
        std::cout << i << ' ';
 
    std::cout << '\n';
 
    for (int i : v) // access by value as well
        std::cout << i << ' ';
 
    std::cout << '\n';
}

0 1 2 3 4 5
0 1 2 3 4 5
0 1 2 3 4 5