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std::experi...ranges::prev(3) C++ Standard Libarystd::experi...ranges::prev(3) NAME std::experimental::ranges::prev - std::experimental::ranges::prev Synopsis Defined in header <experimental/ranges/iterator> namespace { (ranges TS) constexpr /* unspecified */ prev = /* unspecified */; (customization point ob- ject) } Call signature template< Iterator I > (1) constexpr I prev(I i); template< Iterator I > (2) constexpr I prev(I i, ranges::difference_type_t<I> n); template< Iterator I > constexpr I prev(I i, ranges::difference_type_t<I> n, I (3) bound); Decrements the iterator i n times, or until bound is reached, whichever comes first, and returns the decremented iterator. 1) Equivalent to --i; return i;. 2) Equivalent to ranges::advance(i, -n); return i;. 3) Equivalent to ranges::advance(i, -n, bound); return i;. Customization point objects The name ranges::prev denotes a customization point object, which is a function object of a literal Semiregular class type (denoted, for exposition purposes, as PrevT). All instances of PrevT are equal. Thus, ranges::prev can be copied freely and its copies can be used interchangeably. Given a set of types Args..., if std::declval<Args>()... meet the requirements for arguments to ranges::prev above, PrevT will satisfy ranges::Invoca- ble<const PrevT, Args...>. Otherwise, no function call operator of PrevT participates in overload resolution. In every translation unit in which ranges::prev is defined, it refers to the same instance of the customization point object. (This means that it can be used freely in things like inline functions and function templates without vio- lating the one-definition rule.) Return value The decremented iterator. Example This section is incomplete Reason: no example See also prev decrement an iterator (C++11) (function template) advance advances an iterator by given distance (function template) next increment an iterator (function template) returns the distance between an iterator and a sentinel, or between the distance beginning and the end of a range (function template) http://cppreference.com 2022.07.31 std::experi...ranges::prev(3)
NAME | Synopsis | Return value | Example | See also
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