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repetitive_view

Description

repetitive_view presents a view which iterates over a given Sequence repeatedly. Because a repetitive_view has infinite length, it can only be used when some external condition determines the end. Thus, initializing a fixed length sequence with a repetitive_view is okay, but printing a repetitive_view to std::cout is not.

Header
#include <boost/fusion/view/repetitive_view.hpp>
#include <boost/fusion/include/repetitive_view.hpp>
Synopsis
template <typename Sequence>
struct repetitive_view;
Template parameters

Parameter

Description

Default

Sequence

An arbitrary Fusion Forward Sequence

Notation

RV

A repetitive_view type

s

An instance of Sequences

rv, rv1, rv2

Instances of RV

Expression Semantics

Expression

Return Type

Semantics

RV(s)

Creates an repetitive_view given the underlying sequence.

RV(rv1)

Copy constructs an repetitive_view from another repetitive_view, rv1.

rv1 = rv2

Assigns to a repetitive_view, rv1, from another repetitive_view, rv2.

begin(rv)

Forward Iterator

end(rv)

Forward Iterator

Creates an unreachable iterator (since the sequnce is infinite)

Result Type Expressions

Expression

result_of::begin<RV>::type

result_of::end<RV>::type

Example
typedef vector<int, char, double> vec1;
typedef vector<int, char, double, int, char> vec2;

vec1 v1(1, 'c', 2.0);
vec2 v2(repetitive_view<vec1>(v1));

std::cout << v2 << std::endl; // 1, 'c', 2.0, 1, 'c'

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