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'