Boost C++ Libraries

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vector

Description

vector is a Random Access Sequence of heterogenous typed data structured as a simple struct where each element is held as a member variable. vector is the simplest of the Fusion sequence container, and in many cases the most efficient.

Header

#include <boost/fusion/container/vector.hpp>
#include <boost/fusion/include/vector.hpp>
#include <boost/fusion/container/vector/vector_fwd.hpp>
#include <boost/fusion/include/vector_fwd.hpp>

// numbered forms
#include <boost/fusion/container/vector/vector10.hpp>
#include <boost/fusion/include/vector10.hpp>
#include <boost/fusion/container/vector/vector20.hpp>
#include <boost/fusion/include/vector20.hpp>
#include <boost/fusion/container/vector/vector30.hpp>
#include <boost/fusion/include/vector30.hpp>
#include <boost/fusion/container/vector/vector40.hpp>
#include <boost/fusion/include/vector40.hpp>
#include <boost/fusion/container/vector/vector50.hpp>
#include <boost/fusion/include/vector50.hpp>

Synopsis

Numbered forms

template <>
struct vector0;

template <typename T0>
struct vector1;

template <typename T0, typename T1>
struct vector2;

template <typename T0, typename T1, typename T2>
struct vector3;

...

template <typename T0, typename T1, typename T2..., typename TN>
struct vectorN;

Variadic form

template <
    typename T0 = unspecified
  , typename T1 = unspecified
  , typename T2 = unspecified
    ...
  , typename TN = unspecified
>
struct vector;

The numbered form accepts the exact number of elements. Example:

vector3<int, char, double>

The variadic form accepts 0 to FUSION_MAX_VECTOR_SIZE elements, where FUSION_MAX_VECTOR_SIZE is a user definable predefined maximum that defaults to 10. Example:

vector<int, char, double>

You may define the preprocessor constant FUSION_MAX_VECTOR_SIZE before including any Fusion header to change the default. Example:

#define FUSION_MAX_VECTOR_SIZE 20

Template parameters

Parameter

Description

Default

T0...TN

Element types

unspecified

Model of

Notation

v

Instance of vector

V

A vector type

e0...en

Heterogeneous values

s

A Forward Sequence

Expression Semantics

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

Expression

Semantics

V()

Creates a vector with default constructed elements.

V(e0, e1,... en)

Creates a vector with elements e0...en.

V(s)

Copy constructs a vector from a Forward Sequence, s.

v = s

Assigns to a vector, v, from a Forward Sequence, s.

Example

vector<int, float> v(12, 5.5f);
std::cout << at_c<0>(v) << std::endl;
std::cout << at_c<1>(v) << std::endl;

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