std::initializer_list<T>类型的对象是轻量代理对象,提供对constT类型对象数组的访问(可能分配于只读内存)。 std::initializer_list对象在这些时候自动构造: 用花括号包围的初始化式列表来列表初始化一个对象,其中对应的构造函数接受一个std::initializer_list形参。
类型是std::initializer_list<E>的对象从初始化器列表构造时,编译器如同生成并实质化(C++17 起)一个类型是“包含N个constE元素的数组”的纯右值,其中N是初始化器列表中的初始化器子句个数;该数组被称为该初始化器列表的基底数组。 基底数组中的每个元素都会以初始化器列表中的对应初始化器子句复制初始化,并且构...
end(std::initializer_list) size_type size()constnoexcept; (since C++11) (until C++14) constexprsize_type size()constnoexcept; (since C++14) Returns the number of elements in the initializer list, i.e.std::distance(begin(), end()). ...
Complexity Constant Example Run this code #include <initializer_list>intmain(){staticconstexprautoil={42,24};static_assert(*il.begin()==0x2A);} See also end returns a pointer to one past the last element (public member function)
initializer_list(C++11) Concepts library(C++20) Diagnostics library Assertions−System error(C++11) Exception types−Error numbers basic_stacktrace(C++23) Debugging support(C++26) Memory management library Allocators−Smart pointers Memory resources(C++17) ...
Number of skipped elements, for initializer_list offset is calculated as num_to_skip [0]+ num_to_skip [1]*264 + num_to_skip [2]* 2128 + … + num_to_skip [n-1]*264 *(n-1). func InitEngineFunc Functor which would be used to initialize engines. This functor should take ...
basic_string(std::initializer_list<CharT>init, constAllocator&alloc=Allocator()); (9)(desde C++11) Constrói nova cadeia a partir de uma variedade de fontes de dados e, opcionalmente, usando alocador utilizador fornecidoalloc. Original: ...
oneapi/mkl/rng.hpp Input Parameters Name Type Description queue sycl::queue Validsycl::queue, calls ofoneapi::mkl::rng::generate()routine submit kernels in this queue. seed std::uint32_tstd::initializer_list<std::uint32_t> Initial conditions of the engine. ...
declaration-list; } 关键字namespace允许你创建一个新的空间.名字由你选择,忽略创建没有命名的名字空间.一旦你创建了一个名字空间,你必须明确地说明它或者用关键字using. 例如: new pointer = new type; pointer = new type( initializer ); pointer = new type[size]; ...