Passing elements throughstd::initializer_listis very convenient, but it’s good to know that when you pass it to astd::vector’s constructor (or other standard containers), each element has to be copied. It’s because, conceptually, objects in theinitializer_listare put into aconsttemporary ...
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...},那么其实list自动被构造成了initializer_list对象。 下面...
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::...
}//使用 std::initializer_list 传递同类型的数据voidfunc(std::initializer_list<int>list) { std::cout<<"size ="<<list.size() <<std::endl;//对 std::initializer_list 访问只能通过begin() end() 循环遍历//迭代器是只读的,无法修改某一个元素,但可以整体赋值for(auto it = list.begin(); it ...
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我知道这是一个在堆栈溢出中已经被广泛讨论过的主题...
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 ...
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 ...
问如何使用initializer_lists初始化一个二维数组？EN你需要先创建一个指针数组，然后用int数组初始化它们。
Defines the container class template initializer_list and several supporting templates.SyntaxC++ نسخ #include <initializer_list> Classesتوسيع الجدول ClassDescription initializer_list Provides access to an array of elements in which each member is of the ...