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@ -1,6 +1,7 @@
[/==============================================================================
Copyright (C) 2001-2011 Joel de Guzman
Copyright (C) 2006 Dan Marsden
Copyright (c) 2022 Denis Mikhailov
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -328,9 +329,7 @@ defined in __forward_sequence__.
The unary version of `transform_view` presents a view of its underlying
sequence given a unary function object or function pointer. The binary
version of `transform_view` presents a view of 2 underlying sequences,
given a binary function object or function pointer. The `transform_view`
inherits the traversal characteristics (see __traversal_concept__) of
its underlying sequence or sequences.
given a binary function object or function pointer.
[heading Header]
@ -364,7 +363,8 @@ its underlying sequence or sequences.
* __forward_sequence__, __bidirectional_sequence__ or
__random_access_sequence__ depending on the traversal characteristics (see
__traversal_concept__) of its underlying sequence.
__traversal_concept__) of its underlying sequence or sequences.
* __associative_sequence__ if underlying sequence implements the __associative_sequence__ model(available only with unary version of `transform_view`).
[variablelist Notation
[[`TV`] [A `transform_view` type]]
@ -381,9 +381,7 @@ __traversal_concept__) of its underlying sequence.
[heading Expression Semantics]
Semantics of an expression is defined only where it differs from, or is not
defined in __forward_sequence__, __bidirectional_sequence__ or
__random_access_sequence__ depending on the traversal characteristics (see
__traversal_concept__) of its underlying sequence or sequences.
defined in the implemented models.
[table
[[Expression] [Semantics]]
@ -667,4 +665,60 @@ defined in __forward_sequence__.
[endsect]
[section identity_view]
[heading Description]
`identity_view` presents underlying sequence unchanged.
[heading Header]
#include <boost/fusion/view/identity_view.hpp>
#include <boost/fusion/include/identity_view.hpp>
[heading Synopsis]
template <typename Sequence>
struct identity_view;
[heading Template parameters]
[table
[[Parameter] [Description] [Default]]
[[`Sequence`] [A __forward_sequence__] []]
]
[heading Model of]
* A model of __forward_sequence__ if `Sequence` is a __forward_sequence__ else, __bidirectional_sequence__ if `Sequence` is a __bidirectional_sequence__
else, __random_access_sequence__ if `Sequence` is a __random_access_sequence__.
* __associative_sequence__ if `Sequence` implements the __associative_sequence__ model.
[variablelist Notation
[[`IV`] [An `identity_view` type]]
[[`s`] [An instance of `Sequence`]]
[[`iv`, `iv2`] [Instances of `identity_view`]]
]
[heading Expression Semantics]
Semantics of an expression is defined only where it differs from, or is not
defined in the implemented models.
[table
[[Expression] [Semantics]]
[[`IV(s)`] [Creates an `identity_view` given sequence, `s`.]]
[[`IV(iv)`] [Copy constructs an `identity_view` from another `identity_view`, `iv`.]]
[[`iv = iv2`] [Assigns to an `identity_view`, `iv`, from another `identity_view`, `iv2`.]]
]
[heading Example]
typedef __vector__<int, short, double> vector_type;
vector_type vec(2, 5, 3.3);
__identity_view__<vector_type> identity(vec);
std::cout << identity << std::endl; // (2 5 3.3)
[endsect]
[endsect]