1. Distinguish between () and {} when creating objects C++11中，初始化值的指定方式有三种：括号...
我创建了一个新的受保护的构造函数，它将在my_matrix类中以std::initializer<double>作为参数：...
doublesum(std::initializer_list<double> il); doublesum(std::initializer_list<double>il){doubletot =0;for(auto p = il.begin();p != il.end();++p){ tot+= *p; }returntot; }
#include<iostream>classClassX{public://直接是引用ClassX(intval1,intval2){std::cout<<"(int val1, int val2)版本构造函数被调用\n";std::cout<<val1<<"_"<<val2<<"\n\n";}ClassX(std::initializer_list<int>list){std::cout<<"(std::initializer_list<int> list)版本构造函数被调用\n";f...
structX{X(std::initializer_list<double>v);};Xx{1,2,3}; The initialization will be implemented in a way roughly equivalent to this: constdouble__a[3]={double{1},double{2},double{3}};Xx(std::initializer_list<double>(__a,__a+3)); ...
()<<'\n';// special rule for auto means 'fractions' has the// type std::initializer_list<double>autofractions={3.14159,2.71828};std::cout<<"fractions.size(): "<<fractions.size()<<'\n';// create constexpr initializer list (since C++14)staticconstexprautoab={'a','b'};static_...
{} // note: type corrected to double Matrix( std::initializer_list<std::initializer_list<double> > ilist ) : mtx( ilist.size() ) { std::size_t col_size = 0 ; // size of the largest col for( const auto& row : ilist ) col_size = std::max( col_size, row.size() ) ; ...
discrete_distribution( std::initializer_list<double> weights ); (3) (C++11 起) template< class UnaryOperation > discrete_distribution( std::size_t count, double xmin, double xmax, UnaryOperation unary_op ); (4) (C++11 起) explicit discrete_distribution( const param_type& params ); ...
iterator insert( const_iterator pos, std::initializer_list<T> ilist ); //C++11 起 具体用法示例如下：std::deque<int> c1(3, 100); //初始化一个int行的双端队列c1，此时c1 = {100, 100, 100}auto it = c1.begin();it = c1.insert(it, 200); //在it前插入元素200//c1 = {200，100...
list (initializer_list<value_type> il, const allocator_type& alloc = allocator_type()); QList的构造函数只有默认构造函数和拷贝构造函数两种,std::list的构造函数就比较多了。 QList特有的函数: void QList::append ( const T & value ) 在链表的末尾插入value ...