我们通过禁用编译器优化:g++ -o rb rbtree.cpp -std=c++11 -fno-elide-constructors 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Foo(initializer_list<_Tp> &list) 调用了拷贝构造函数调用了=操作符重载 4.multimap 同map一样multimap不允许修改key。但是插入使用的是_M_insert_equal。 代码语言:ja...
std::initializer_list并不是一个容器,不要用它传递期望长期存储的值。构造函数的形参如果为一个initializer_list模板类,则这种特殊的构造函数称为初始化器列表构造函数(initializer_list constructor),例如: struct myclass { myclass (int,int); myclass (initializer_list<int>); /* definitions ... */ };...
我们通过禁用编译器优化:g++ -o rb rbtree.cpp -std=c++11 -fno-elide-constructors Foo(initializer_list<_Tp> &list) 调用了拷贝构造函数 调用了=操作符重载 4.multimap 同map一样multimap不允许修改key。但是插入使用的是_M_insert_equal。 template <typename _Key, typename _Tp, typename _Compare = ...
In the following example, our Foo(int, int) constructor has been updated to use a member initializer list to initialize m_x, and m_y: #include <iostream> class Foo { private: int m_x {}; int m_y {}; public: Foo(int x, int y) : m_x { x }, m_y { y } // here's ...
你也可以在自己的类中实现 initializer_list constructors ,让后使用迭代器(iterator)来遍历initializer llist。 #include <vector>#include<initializer_list>usingnamespacestd; template<typename T>classMyArray {private: vector<T>m_Array;public: MyArray() { } ...
structS{intn;S(int);// constructor declarationS():n(7){}// constructor definition:// ": n(7)" is the initializer list// ": n(7) {}" is the function body};S::S(intx):n{x}{}// constructor definition: ": n{x}" is the initializer listintmain(){S s;// calls S::S()S...
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...
// The compiler can call a private constructor.constexprinitializer_list(const_iterator__a,size_type__l)// 实际使用的构造函数:_M_array(__a),_M_len(__l){}public:constexprinitializer_list()noexcept// 这里,构造了一个空对象:_M_array(0),_M_len(0){}// Number of elements.constexpr...
initializer_list<int> i1{1,2,3,4}; The compiler transforms braced initializer lists with homogeneous elements into aninitializer_listwhenever the function signature requires aninitializer_list. For more information about usinginitializer_list, seeUniform initialization and delegating constructors ...
Hi I thought classname obj{Val} is initializer list... So, what is classname obj = {Val} Does second option i.e. with equal to call implicit constructor ? #include <iostream> using namespace std; class X { public: int x; explicit X(int x) : x(x){} }; int main() { X a ...