range-for是C++ 11新增特性,用于循环迭代一个“范围”,该“范围”类似于包含有begin()和end()方法的STL序列容器。所有的STL标准容器都适用于该“范围”,例如vector、string等等。数组也同样可以,只要定义了begin()和end()方法的任何“范围”都可以使用for来循环迭代容器里面的元素,如istream。 语法: for(range_de...
If the loop needs to be terminated withinstatement, abreakstatementcan be used as terminating statement. If the current iteration needs to be terminated withinstatement, acontinuestatementcan be used as shortcut. Notes As is the case withwhileloop, ifstatementis not a compound statement, the sco...
The step-by-step working of the basic cpp for loop is as follows: Initialization: A counter variable is initialized with a starting value at the beginning of the loop. This variable is used to track the number of the current iteration. Loop Condition Check: Before each iteration, we check...
__cpp_range_based_for200907L(C++11)Range-basedforloop 201603L(C++17)Range-basedforloop withdifferentbegin/endtypes 202211L(C++23)Lifetime extension for all temporary objects inrange-initializer Keywords for Example Run this code #include <iostream>#include <vector>intmain(){std::vector<int>...
参考http://en.cppreference.com/w/cpp/language/range-for 可知, 语句for ( range_declaration : range_expression) loop_statement 与以下语句作用等价: 1 2 3 4 5 6 7 8 9 { auto && __range = range_expression ; for (auto __begin = begin_expr, __end = end_expr; __begin != _...
基于范围的for循环(C++11)for 语句允许简单的范围迭代:int my_array[5] = {1, 2, 3, 4, 5}; // 每个数组元素乘于 2 for (int &x : my_array) { x *= 2; cout << x << endl; } // auto 类型也是 C++11 新标准中的,用来自动获取变量的类型 for (auto &x : my_array) { x *= ...
参考http://en.cppreference.com/w/cpp/language/range-for 可知, 语句for ( range_declaration : range_expression) loop_statement 与以下语句作用等价: auto && __range = range_expression ; for (auto __begin = begin_expr, __end = end_expr; ...
【C++11新特性】范围for循环 C++11引入了范围for循环,它是一种更简洁和易用的循环语法,用于遍历数组、容器类(例如std::vector、std::list等)或支持迭代器的类型。 范围for循环遍历数组的示例 代码语言:javascript 代码运行次数:0 int arr[=1forint num:arr){std::cout<<num<<" ";}// 输出:1 2 3 4 ...
Some of us don't have the option to use C++11, especially those of us in the embedded space. Project leads, or funky OS requirements, sometimes prevent us from using what we want to use. There is no way Q_FOREACH can't expand into C+=11 ranged for() loop?
这里引用一下cppreference上对它的解释 // https://en.cppreference.com/w/cpp/language/range-for { // until C++17 auto && __range = range-expression ; for (auto __begin = begin-expr, __end = end-expr; __begin != __end; ++__begin) { range-declaration = *__begin; loop-statement...