std:: incrementable_traits

From cppreference.com

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)
sized_sentinel_for (C++20)
input_iterator (C++20)
output_iterator (C++20)
input_or_output_iterator (C++20)

forward_iterator (C++20)
bidirectional_iterator (C++20)
random_access_iterator (C++20)
contiguous_iterator (C++20)

Iterator primitives

input_iterator_tag output_iterator_tag forward_iterator_tag bidirectional_iterator_tag random_access_iterator_tag contiguous_iterator_tag

(C++20)

iter_value_t iter_difference_t iter_reference_t iter_const_reference_t iter_rvalue_reference_t iter_common_reference_t

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

iterator (deprecated in C++17)
iterator_traits
incrementable_traits (C++20)
indirectly_readable_traits (C++20)

Algorithm concepts and utilities

Indirect callable concepts

indirectly_unary_invocable indirectly_regular_unary_invocable

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

indirect_unary_predicate (C++20)
indirect_binary_predicate (C++20)

indirect_equivalence_relation (C++20)
indirect_strict_weak_order (C++20)

Common algorithm requirements

indirectly_movable (C++20)
indirectly_movable_storable (C++20)
indirectly_copyable (C++20)

indirectly_copyable_storable (C++20)
indirectly_swappable (C++20)
indirectly_comparable (C++20)

permutable (C++20)
mergeable (C++20)
sortable (C++20)

Utilities

indirect_result_t

(C++20)

projected

(C++20)

projected_value_t

(C++26)

Iterator adaptors

reverse_iterator
make_reverse_iterator (C++14)
move_iterator (C++11)
make_move_iterator (C++11)
default_sentinel_t default_sentinel (C++20) (C++20)
unreachable_sentinel_t unreachable_sentinel (C++20) (C++20)

front_insert_iterator
back_insert_iterator
inserter
insert_iterator
front_inserter
back_inserter
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)

Stream iterators

istream_iterator
ostream_iterator

istreambuf_iterator
ostreambuf_iterator

Iterator customization points
ranges::iter_move (C++20)
ranges::iter_swap (C++20)

Iterator operations

advance
distance
prev (C++11)
next (C++11)

ranges::advance (C++20)
ranges::distance (C++20)
ranges::prev (C++20)
ranges::next (C++20)

Range access

begin cbegin (C++11) (C++14)
rbegin crbegin (C++14) (C++14)

end cend (C++11) (C++14)
rend crend (C++14) (C++14)

size ssize (C++17) (C++20)
empty (C++17)
data (C++17)

Defined in header `<iterator>`
template < class I > struct incrementable_traits { } ;	(1)	(since C++20)
template < class T > requires std:: is_object_v < T > struct incrementable_traits < T * > ;	(2)	(since C++20)
template < class T > struct incrementable_traits < const T > : incrementable_traits < T > { } ;	(3)	(since C++20)
template < class T > requires requires { typename T :: difference_type ; } struct incrementable_traits < T > ;	(4)	(since C++20)
template < class T > requires ( ! requires { typename T :: difference_type ; } ) && requires ( const T & a, const T & b ) { { a - b } - > std:: integral ; } struct incrementable_traits < T > ;	(5)	(since C++20)

Computes the associated difference type of the type I , if any. A program may specialize incrementable_traits for a program-defined type .

1) Primary template is an empty struct.

2) Specialization for pointers.

Provides a member type


        difference_type

same as std::ptrdiff_t .

3) Specialization for const-qualified types.

4) Specialization for types that define a public and accessible member type


        difference_type

Provides a member type


        difference_type

same as


        T::difference_type

5) Specialization for types that do not define a public and accessible member type


        difference_type

but do support subtraction.

Provides a member type


        difference_type

same as std:: make_signed_t < decltype ( std:: declval < T > ( ) - std:: declval < T > ( ) ) > . The implicit expression variations rule (see below) applies to the expression a - b .

Implicit expression variations

A requires expression that uses an expression that is non-modifying for some constant lvalue operand also requires implicit expression variations .

Example

This section is incomplete
Reason: no example

Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Metaprogramming library (C++11)
Diagnostics library
General utilities library
Strings library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Numerics library
Localizations library
Input/output library
Filesystem library (C++17)
Regular expressions library (C++11)
Concurrency support library (C++11)
Execution support library (C++26)
Technical specifications
Symbols index
External libraries

weakly_incrementable (C++20)	specifies that a `semiregular` type can be incremented with pre- and post-increment operators (concept)
iter_value_t iter_reference_t iter_const_reference_t iter_difference_t iter_rvalue_reference_t iter_common_reference_t (C++20) (C++20) (C++23) (C++20) (C++20) (C++20)	computes the associated types of an iterator (alias template)
iterator_traits	provides uniform interface to the properties of an iterator (class template)

std:: incrementable_traits

Implicit expression variations

Example

See also

Navigation