sequenceen.cppreference.com/w/cpp/utility/integer_sequence 其中有一条 template<class T, T N> using make_integer_sequence = std::integer_sequence<T, /* a sequence 0, 1, 2, ..., N-1 */ >; 起初没有仔细想,以为这种将一个参数N拆出N个元函数参数的效果是靠编译器开洞实现的,像std...
template<size_t..Ints>using index_sequence=std::integer_sequence<size_t,Ints...>; 通常我们不会直接使用std::integer_sequence,而是通过定义一个size_t的std::integer_sequnece命名为index_sequence。 2.3 std::make_index_sequence 这里就是生成了一组数字序列0,1,2,3...N - 1的一组std::index_se...
using index_sequence = std::integer_sequence<std::size_t, Ints...>;Helper alias templates std::make_integer_sequence and std::make_index_sequence are defined to simplify creation of std::integer_sequence and std::index_sequence types, respectively, with 0, 1, 2, ..., N - 1...
(注意,这里调用std::make_index_sequence{}的构造函数没有任何意义,纯粹只是利用了它能够生成编译期整数列的能力。) 接着我们来看squere_num函数,这就是我们实际进行平方计算,并生成编译期静态数组的地方了,它的实现很简单,就是依次展开通过std::make_index_sequence生成的数字,并进行平方计算,最后塞到std::array...
type_index::name Helper classes hash<std::type_index> (C++11) Defined in header<typeindex> classtype_index; (since C++11) Member functions (constructor) constructs the object (public member function) (destructor) (implicitly declared)
index_sequence<> (C++14 起) index_sequence_for<> (C++14 起) indirect<> (C++26 起) indirect_array<> indirect_binary_predicate<> (C++20 起) indirect_equivalence_relation<> (C++20 起) indirect_result_t<> (C++20 起) indirect_strict_weak_order<> (C++20 起) indirect_unary_predicate<> ...
1,2)Returnsc.end(), which is typically an iterator one past the end of the sequence represented byc. 1)IfCis a standardContainer, returns aC::iteratorobject. 2)IfCis a standardContainer, returns aC::const_iteratorobject. 3)Returns a pointer to the end ofarray. ...
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本文提供有关解决从 STD C++ 库引用函数时发生的 C2653 或 C2039 错误的信息。 原始产品版本:Visual C++ 原始KB 数:243444 现象 尝试使用命名空间std(例如,std::exit(0))从 STD C++ 库标头<cstdlib>引用函数会导致编译器发出 C2653 或 C2039(具体取决于是否在发出错误时定义命名空间std)...
undefined reference to `std::cout'等错误 (1)gcc和g++都是GNU(组织)的一个编译器。 (2)后缀名为.c的程序和.cpp的程序g++都会当成是c++的源程序来处理。而gcc不然,gcc会把.c的程序处理成c程序。 (3)对于.cpp的程序,编译可以用gcc/g++,而链接可以用g++或者gcc -lstdc++。