LSSTApplications
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LSSTDataManagementBasePackage
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A functor-wrapper used in the implementation of Schema::forEach. More...
#include <SchemaImpl.h>
Public Member Functions | |
template<typename T > | |
void | operator() (SchemaItem< T > const &x) const |
Call the wrapped function. More... | |
void | operator() (ItemVariant const &v) const |
Invoke the visitation. More... | |
template<typename T > | |
VisitorWrapper (T &&func) | |
Construct the wrapper. More... | |
A functor-wrapper used in the implementation of Schema::forEach.
Visitor functors used with Boost.Variant (see the Boost.Variant docs) must inherit from boost::static_visitor<> to declare their return type (void, in this case). By wrapping user-supplied functors with this class, we can hide the fact that we've implemented SchemaImpl using Boost.Variant (because they won't need to inherit from static_visitor themselves.
Definition at line 158 of file SchemaImpl.h.
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inlineexplicit |
Construct the wrapper.
Definition at line 178 of file SchemaImpl.h.
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inline |
Call the wrapped function.
Definition at line 161 of file SchemaImpl.h.
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inline |
Invoke the visitation.
The call to boost::apply_visitor will call the appropriate template of operator().
This overload allows a VisitorWrapper to be applied directly on a variant object with function-call syntax, allowing us to use it on our vector of variants with std::for_each and other STL algorithms.
Definition at line 174 of file SchemaImpl.h.