当然啦,里面的std::map必须提供参数为initializer_list的构造函数如: map( std::initializer_list<value_type>init,constCompare& comp =Compare(),constAllocator& alloc = Allocator() ); 其实for(initializer: list)中如果list是个形如:{a, b, c..
由于std::initializer_list 是一个类,所以不局限在构造函数中使用,普通的函数也可以使用,像这样: void DealWithAll(std::initializer_list<int>intList) { for(auto i: intList) {//printall number cout<<i<<endl; } unsigned int count=0; //countforthe odd numbersinthe list, you can use std::...
In C++11, we got a handy way to initialize various containers. Rather than using push_back() or insert() several times, you can leverage a single constructor by taking an initializer list. For example, with a vector of strings, you can write: std::vector
但在CppCoreGuideline中,非常推荐这种写法。原因是有一个类型检查 intc =3.3;//这里会进行默认类型转换intb = {3.3};//这里编译器会给出警告(也有可能是错误) 理论上,这样的代码更加健壮。 自定义类型使用initializer_list c++11也提供了方法,让用户可以在自定义类型(一般指类)中使用初始化列表。 #include<iost...
c++11特性initializer_list 一、概念 initializer_list是C++11中提供的一种标准库类型(ps:其实也是一个模板类),用于表示某种使用特定类型的值的数组。 initializer_list中的值都是常量值,无法修改。 二、提供的操作(以int型举例) 申明: initializer_list<int> lst;...
问列表初始化、Initializer_list和C++中的相关问题EN因此，无论何时使用大括号，您都在使用聚合初始化，...
creates an empty initializer list (public member function) Capacity size returns the number of elements in the initializer list (public member function) Iterators begin returns a pointer to the first element (public member function) end returns a pointer to one past the last element ...
Second, std::initializer_list has a (misnamed) size() function which returns the number of elements in the list. This is useful when we need to know the length of the list passed in. Third, std::initializer_list is often passed by value. Much like std::string_view, std::initializer...
问initializer_list构造函数的列表初始化和重载解析失败EN这种行为是有道理的。Scott在“有效的现代C++”(...
An initializer_list is based on an array of objects of the specified type. Copying an initializer_list creates a second instance of a list pointing to the same objects; the underlying objects are not copied. Example c++ 複製 // initializer_list_class.cpp // compile with: /EHsc #include ...