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set is an Associative Sequence of heteregenous typed data elements. Type identity is used to impose an equivalence relation on keys. The element's type is its key. A set may contain at most one element for each key. Membership testing and element key lookup has constant runtime complexity (see Overloaded Functions).
#include <boost/fusion/container/set.hpp> #include <boost/fusion/include/set.hpp> #include <boost/fusion/container/set/set_fwd.hpp> #include <boost/fusion/include/set_fwd.hpp>
template < typename T0 = unspecified , typename T1 = unspecified , typename T2 = unspecified ... , typename TN = unspecified > struct set;
The variadic class interface accepts 0
to FUSION_MAX_SET_SIZE elements,
where FUSION_MAX_SET_SIZE
is a user definable predefined maximum that defaults to 10.
Example:
set<int, char, double>
You may define the preprocessor constant FUSION_MAX_SET_SIZE
before including any Fusion header to change the default. Example:
#define FUSION_MAX_SET_SIZE 20
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Parameter |
Description |
Default |
|---|---|---|
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Element types |
unspecified |
Notation
S
A set type
s
An instance of set
e0...enHeterogeneous values
fsSemantics of an expression is defined only where it differs from, or is not defined in Random Access Sequence and Associative Sequence.
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Expression |
Semantics |
|---|---|
|
|
Creates a set with default constructed elements. |
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Creates a set with elements |
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Copy constructs a set from a Forward
Sequence |
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Assigns to a set, |
typedef set<int, float> S; S s(12, 5.5f); std::cout <<at_key<int>(s) << std::endl; std::cout <<at_key<float>(s) << std::endl; std::cout <<result_of::has_key<S, double>::value << std::endl;