no-throw-input-iterator, no-throw-forward-iterator, no-throw-sentinel-for, no-throw-input-range, no-throw-forward-range

 

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template<class I> concept no-throw-input-iterator = // 仅用于阐释   std::input_iterator<I> &&   std::is_lvalue_reference_v<std::iter_reference_t<I>> &&   std::same_as<std::remove_cvref_t<std::iter_reference_t<I>>, std::iter_value_t<I>>;	(1)	(C++20 起)
template<class I> concept no-throw-forward-iterator = // 仅用于阐释   no-throw-input-iterator<I> &&   std::forward_iterator<I> &&   no-throw-sentinel-for<I, I>;	(2)	(C++20 起)
template<class S, class I> concept no-throw-sentinel-for = std::sentinel_for<S, I>; // 仅用于阐释	(3)	(C++20 起)
template<class R> concept no-throw-input-range = // 仅用于阐释   ranges::range<R> &&   no-throw-input-iterator<ranges::iterator_t<R>> &&   no-throw-sentinel-for<ranges::sentinel_t<R>, ranges::iterator_t<R>>;	(4)	(C++20 起)
template<class R> concept no-throw-forward-range = // 仅用于阐释   no-throw-input-range<R> &&   no-throw-forward-iterator<ranges::iterator_t<R>>;	(5)	(C++20 起)

这些仅用于阐释的概念指定迭代器、哨位和范围上算法所要求的操作均不抛异常。

1) no-throw-input-iterator 概念要求解引用迭代器产生左值，类似 contiguous_iterator 与老式向前迭代器 (LegacyForwardIterator) 。

语义要求

类似所有标准概念，此处列出的每个概念得以实现，仅若其所蕴含的所有概念均被实现。

1) 类型 I 实现 no-throw-input-iterator ，仅若自增、复制构造、移动构造、复制赋值、移动赋值或通过合法迭代器的间接不抛出异常。

3) 类型 S 与 I 实现 no-throw-sentinel-for ，仅若复制构造、移动构造、复制赋值、移动赋值或类型 I 与 S 的合法值间的比较不抛异常。

4) 类型 R 实现 no-throw-input-range ，仅若在 R 类型对象上调用 ranges::begin 与 ranges::end 不抛异常。

注解

这些概念允许迭代器和哨位上的某些操作抛出异常，例如非法值上的操作。

参阅

input_iterator (C++20)	指定类型为输入迭代器，即可读取其所引用的值，且可前/后自增 (概念)
forward_iterator (C++20)	指定 input_iterator 为向前迭代器，支持相等比较与多趟操作 (概念)
sentinel_for (C++20)	指定类型为某个 input_or_output_iterator 类型的哨位类型 (概念)
ranges::input_range (C++20)	指定范围的迭代器类型满足 input_iterator (概念)
ranges::forward_range (C++20)	指定范围的迭代器类型满足 forward_iterator (概念)