map_tie

Description

Constructs a tie using a map sequence.

Synopsis

template <typename K0, typename K1,... typename KN, typename D0, typename D1,... typename DN>
map<pair<K0, D0&>, pair<K1, D1&>,... pair<KN, DN&> >
map_tie(D0& d0, D1& d1... DN& dN);

The variadic function accepts 0 to FUSION_MAX_MAP_SIZE elements, where FUSION_MAX_MAP_SIZE is a user definable predefined maximum that defaults to 10, and a corresponding number of key types. You may define the preprocessor constant FUSION_MAX_MAP_SIZE before including any Fusion header to change the default. Example:

#define FUSION_MAX_MAP_SIZE 20

Parameters

Parameter	Requirement	Description
`K0, K1,... KN`	Any type	The key types associated with each of the `x1,x2,...,xN` values
`x0, x1,... xN`	Instances of `T0, T1,... TN`	The arguments to `map_tie`

Expression Semantics

map_tie<K0, K1,... KN>(x0, x1,... xN);

Return type: map<pair<K0, D0&>, pair<K1, D1&>,... pair<KN, DN&> >

Semantics: Create a map of references from x0, x1,... xN with keys K0, K1,... KN

Header

#include <boost/fusion/container/generation/map_tie.hpp>
#include <boost/fusion/include/map_tie.hpp>

Example

struct int_key;
struct double_key;
...
int i = 123;
double d = 123.456;
map_tie<int_key, double_key>(i, d)