operator-(std::counted_iterator<I>, std::default_sentinel_t)

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Iterator library

Iterator concepts

indirectly_readable (C++20)
indirectly_writable (C++20)
weakly_incrementable (C++20)
incrementable (C++20)
is-integer-like is-signed-integer-like (C++20)(C++20)

sentinel_for (C++20)
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input_iterator (C++20)
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contiguous_iterator (C++20)

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input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag

(C++20)

iter_value_titer_difference_titer_reference_titer_const_reference_titer_rvalue_reference_titer_common_reference_t

(C++20)(C++20)(C++20)(C++23)(C++20)(C++20)

iterator (deprecated in C++17)
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indirectly_unary_invocableindirectly_regular_unary_invocable

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indirect_unary_predicate (C++20)
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indirectly_movable (C++20)
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(C++20)

(C++20)

(C++26)

reverse_iterator
make_reverse_iterator (C++14)
move_iterator (C++11)
make_move_iterator (C++11)
default_sentinel_tdefault_sentinel (C++20)(C++20)
unreachable_sentinel_tunreachable_sentinel (C++20)(C++20)

front_insert_iterator
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move_sentinel (C++20)

common_iterator (C++20)
counted_iterator (C++20)
basic_const_iterator (C++23)
const_iterator (C++23)
const_sentinel (C++23)
make_const_iterator (C++23)
make_const_sentinel (C++23)

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begincbegin (C++11)(C++14)
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sizessize (C++17)(C++20)
empty (C++17)
data (C++17)

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std::counted_iterator

Member functions
counted_iterator::counted_iterator
counted_iterator::operator=
counted_iterator::base
counted_iterator::count
counted_iterator::operator*counted_iterator::operator->
counted_iterator::operator[]
counted_iterator::operator++counted_iterator::operator++(int)counted_iterator::operator+counted_iterator::operator+=counted_iterator::operator--counted_iterator::operator--(int)counted_iterator::operator-counted_iterator::operator-=
Non-member functions
operator==operator<=> (C++20)(C++20)
operator==(default_sentinel_t) (C++20)
operator+ (C++20)
operator- (C++20)
operator-(default_sentinel_t) (C++20)
iter_move (C++20)
iter_swap (C++20)
Helper classes
iterator_traits<std::counted_iterator> (C++20)

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friendconstexprstd::iter_difference_t<I> operator-( const counted_iterator& x,std::default_sentinel_t);	(1)	(since C++20)
friendconstexprstd::iter_difference_t<I> operator-( std::default_sentinel_t,const counted_iterator& y);	(2)	(since C++20)

1) Returns the negative distance to the end.

2) Returns the positive distance to the end.

This function template is not visible to ordinaryunqualified orqualified lookup, and can only be found byargument-dependent lookup when std::counted_iterator<I> is an associated class of the arguments.

[edit]Parameters

x, y

iterator adaptors to compute the difference of

[edit]Return value

1)-x.count()

2)y.count()

[edit]Example

Run this code

#include <initializer_list>#include <iterator> int main(){constexprstaticauto v={1,2,3,4};constexprstd::counted_iterator<std::initializer_list<int>::iterator>        it{v.begin(),3};constexprauto d1= it-std::default_sentinel;    static_assert(d1==-3);// (1)constexprauto d2=std::default_sentinel- it;    static_assert(d2==+3);// (2)}

[edit]See also

operator++operator++(int)operator+=operator+operator--operator--(int)operator-=operator-	advances or decrements the`counted_iterator` (public member function)[edit]
operator+ (C++20)	advances the iterator (function template)[edit]
operator- (C++20)	computes the distance between two iterator adaptors (function template)[edit]
default_sentinel_t (C++20)	default sentinel for use with iterators that know the bound of their range (class)[edit]

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operator-(std::counted_iterator<I>, std::default_sentinel_t)

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