4. auto __end = end_expr(__range); 5. for (;__begin != __end; ++__begin) { 6. range_declaration = *__begin; 7. loop_statement 8. } 9. } 1. 2. 3. 4. 5. 6. 7. 8. 9. 请注意,“等价于”并不表示编译器就是这么实现range-based for loop
With arrays taken care of by the first rule, the second rule makes sure that all the standard containers as well as all the user-defined ones that follow the standard sequence interface will work with range-basedforout of the box. For example, in ODB (an ORM for C++), we have the co...
解释range-based 'for'循环不允许的原因 range-based 'for'循环是C++11及更高版本引入的一个新特性,它允许以一种更简洁的方式遍历容器或其他序列。当你在C++98模式下编译代码时,编译器不支持这种新特性,因此会报错:[error] range-based 'for' loops are not allowed in c++98 mode。这是因为C++98标准中并没...
1. Range-Based for Loops for ( decl : coll ) { statement } eg: for(inti : {2,3,5,7,9,13,17,19} ) { std::cout<< i <<std::endl; } std::vector<double>vec; ...for( auto&elem : vec ) { elem*=3; } Here, declaring elem as a reference is important because otherwise t...
C++: Range-Based For Loops23 June 2017 by Phillip Johnston • Last updated 15 December 2021 One of the more frequently used C++ constructs I use is the range-based for loop. The range-based forloop format was introduced in C++11, so you’ll need to enable that language set (or newer...
Range-based for loops won’t work with decayed C-style arrays. This is because a range-based for-loop needs to know the length of the array to know when traversal is complete, and decayed C-style arrays do not contain this information. ...
一些C++11语言新特性 - Range-Based for Loops,1.Range-BasedforLoopsfor(decl:coll){statement}eg:for(inti:{2,3,5,7,9,13,17,19}){std::coutvec;...for(auto&elem:vec...
for(auto i = v.begin(); i != v.end(); ++i) That is already a big improvement, but there is the tedium of always specifying thebeginandendvalues. This is where the new range-based for loop syntax comes in. The entire expression can be reduced to: ...
Dev C++ [Error] range-based 'for' loops are not allowed in C++98 mode,程序员大本营,技术文章内容聚合第一站。
4.基于范围的for循环(Range-based for loops) C++11给for循环定义了"range"的概念,这样可以使for循环可以使用类似java的简化的for循环,可以用于遍历数组,容器,string以及由begin和end函数定义的序列(有迭代器Iterator),示例代码如下: intmy_array[5] = {1,2,3,4,5};for(int&x : my_array) ...