Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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single_view

single_view is a view into a value as a single element sequence.

Header

#include <boost/fusion/view/single_view.hpp>
#include <boost/fusion/include/single_view.hpp>

Synopsis

template <typename T>
struct single_view;

Template parameters

Parameter

Description

Default

T

Any type

Model of

Notation

S

A single_view type

s, s2

Instances of single_view

x

An instance of T

Expression Semantics

Semantics of an expression is defined only where it differs from, or is not defined in Forward Sequence.

Expression

Semantics

S(x)

Creates a single_view from x.

S(s)

Copy constructs a single_view from another single_view, s.

s = s2

Assigns to a single_view, s, from another single_view, s2.

Example

single_view<int> view(3);
std::cout << view << std::endl;

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