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##### 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)