问如何使用std::initializer_list<double>创建构造函数EN我目前正在学习类和构造函数。还请注意，它当前委...
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：...
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)); ...
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; }
()<<'\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_...
{}会自动将里面的内容拿出来,寻找合适的构造函数ClassX objX_1{100,100};ClassXobjX_2({100,100});//std::initializer_list<int>本质上是容器,对个数没有限制ClassX objX_3{100,100,100,100};//下面是错误的,{}对类型的要求更加严格//不能从double自动转换为int//ClassX objX_4{ 100.0, 100.0 ...
() ) ; } // checked element access double& element_at( std::size_t i, std::size_t j ) { return mtx.at(i).at(j) ; } double element_at( std::size_t i, std::size_t j ) const { return mtx.at(i).at(j) ; } // unchecked element access double& operator() ( std::...
static constexpr std::array<double, 2> v4 = {3.1, 2.5}; static constexpr std::array<double, 3> v5 = {3.4, 5.7, 3.2};static constexpr auto sCompressed = std::make_tuple( std::make_tuple(v1, v5), std::make_tuple( std::array<std::array<double, 2>, 2>{...
static constexpr double v0 = 1.0; static constexpr int v1 = 2; static constexpr std::array<double, 2> v2 = {1.1, 2.1}; static constexpr double v3 = 2.3; static constexpr std::array<double, 2> v4 = {3.1, 2.5}; static constexpr std::array<double, 3> v...
{}会自动将里面的内容拿出来,寻找合适的构造函数ClassX objX_1{100,100};ClassXobjX_2({100,100});//std::initializer_list<int>本质上是容器,对个数没有限制ClassX objX_3{100,100,100,100};//下面是错误的,{}对类型的要求更加严格//不能从double自动转换为int//ClassX objX_4{ 100.0, 100.0 ...