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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).
<<<<<<< .working#include <boost/fusion/container/set.hpp> #include <boost/fusion/include/set.hpp> #include <boost/fusion/container/set_fwd.hpp> #include <boost/fusion/include/set_fwd.hpp><<<<<<< .working
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<<<<<<< .working
Parameter |
Description |
Default |
|---|---|---|
T0...TN |
Element types |
unspecified-type |
Notation
A set type
An instance of set
Heterogeneous values
Semantics of an expression is defined only where it differs from, or is not defined in Random Access Sequence and Associative Sequence.
Expression |
Semantics |
|---|---|
S() |
Creates a set with default constructed elements. |
S(e0, e1,... en) |
Creates a set with elements e0...en. |
S(fs) |
Copy constructs a set from a Forward Sequence fs. |
s = fs |
Assigns to a set, s, from a Forward Sequence fs. |
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;