`std::tuple` 的推导指引

工具库

语言支持
类型支持（基本类型、 RTTI）
库功能特性测试宏 (C++20)
动态内存管理
程序工具
协程支持 (C++20)
变参数函数
is_constant_evaluated (C++20)
is_within_lifetime (C++26)
initializer_list (C++11)
source_location (C++20)
三路比较 (C++20)
three_way_comparablethree_way_comparable_with (C++20)(C++20)
strong_ordering (C++20)
weak_ordering (C++20)
partial_ordering (C++20)
common_comparison_category (C++20)
compare_three_way_result (C++20)
compare_three_way (C++20)
strong_order (C++20)
weak_order (C++20)
partial_order (C++20)
compare_strong_order_fallback (C++20)
compare_weak_order_fallback (C++20)
compare_partial_order_fallback (C++20)
is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

通用工具

格式化库 (C++20)

bitset

hash

(C++11)

关系运算符 (C++20 中弃用)

rel_ops::operator!=rel_ops::operator>

rel_ops::operator<=rel_ops::operator>=

整数比较函数

cmp_equalcmp_lesscmp_less_than

(C++20)(C++20)(C++20)

cmp_not_equalcmp_greatercmp_greater_than

(C++20)(C++20)(C++20)

in_range

(C++20)

swap 与类型运算

常用词汇类型

初等字符串转换

在标头 `<tuple>` 定义
template<class... UTypes> tuple(UTypes...) -> tuple<UTypes...>;	(1)	(C++17 起)
template<class T1, class T2> tuple(std::pair<T1, T2>) -> tuple<T1, T2>;	(2)	(C++17 起)
template<class Alloc, class... UTypes> tuple(std::allocator_arg_t, Alloc, UTypes...) -> tuple<UTypes...>;	(3)	(C++17 起)
template<class Alloc, class T1, class T2> tuple(std::allocator_arg_t, Alloc, std::pair<T1, T2>) -> tuple<T1, T2>;	(4)	(C++17 起)
template<class Alloc, class... UTypes> tuple(std::allocator_arg_t, Alloc, tuple<UTypes...>) -> tuple<UTypes...>;	(5)	(C++17 起)

为 std::tuple 提供这些推导指引，以涵盖隐式推导指引缺失的极端情况，特别是不可复制参数和数组到指针转换。

运行此代码

#include <tuple>
int main()
{
    int a[2], b[3], c[4];
    std::tuple t1{a, b, c}; // 用于此场合的显式推导指引
}

成员函数
tuple::tuple
tuple::operator=
tuple::swap
非成员函数
make_tuple
tie
forward_as_tuple
tuple_cat
operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20 前)(C++20 前)(C++20 前)(C++20 前)(C++20 前)(C++20)
std::swap
get
推导指引(C++17)
辅助概念
`tuple-like` (C++23)
辅助类
tuple_size
tuple_element
uses_allocator
basic_common_reference (C++23)
common_type (C++23)
ignore

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