using make_integer_sequence = std::integer_sequence<T, /* 序列 0, 1, 2, ..., N-1 */>; template< std::size_t N > using make_index_sequence = std::make_integer_sequence<std::size_t, N>;若N 为负则程序非良构。若 N 为零,则指示类型为 integer_sequence<T>。
apply-impl(F&& f, Tuple&& t, std::index_sequence<I...>) // exposition only { return INVOKE(std::forward<F>(f), std::get<I>(std::forward<Tuple>(t))...); } The effect is equivalent to: return apply-impl(std::forward<F>(f), std::forward<Tuple>(t), std::make_index_...
类型特征(如std::is_integral、std::rank),编译时常量(如std::integer_sequence、std::ratio)。 常量求值语境 在标头<type_traits>定义 is_constant_evaluated (C++20) 检测调用是否在常量求值的语境内发生 (函数) is_within_lifetime (C++26) 在编译时检查指定对象是否在它的生存期内 ...
General C/C++ Pre-processor commands Operator Precedence Escape Sequences ASCII Chart Data Types Keywords Standard C Library Standard C I/O Standard C String & Character Standard C Math Standard C Time & Date Standard C Memory Other standard C functions All C Functions C++ C+...
Parameters f-Callableobject to be invoked t-tuple whose elements to be used as arguments tof Return value What returned byf. Possible implementation namespacedetail{template<classF,classTuple,std::size_t...I>constexprdecltype(auto)apply_impl(F&&f, Tuple&&t,std::index_sequence<I...>){return...
Original: returns a program-wide unique integer that is safe to use as index to pword() and iword() The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (of std::ios_base função public static memb...
basic_string&erase(size_type index=0, size_type count=npos); (1)(constexpr since C++20) (2) iterator erase(iterator position); (until C++11) iterator erase(const_iterator position); (since C++11) (constexpr since C++20) (3)
y = res.y * x; return res; } // Operator (+=) // SomeClass cls; // cls += 10.0; SomeClass& operator +=(double x){ m_x += x; m_y += y; return *this; } // Operator index -> obj[2] // SomeClass cls; // double z = cls[2]; //--- double operator[](int idx...
>classbasic_string; (1) namespacepmr{ template< classCharT, classTraits=std::char_traits<CharT> >usingbasic_string= std::basic_string<CharT, Traits,std::pmr::polymorphic_allocator<CharT>>; } (2)(since C++17) The class templatebasic_stringstores and manipulates sequences ofcharacter-like obj...
Original: associated input sequence has reached end-of-file The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.[modifica] Original: state of the stream type The following constants are also defined: Constant...