lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F > Struct Template Reference

A functor-wrapper used in the implementation of Schema::forEach. More...

#include <SchemaImpl.h>

Inheritance diagram for lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F >:

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...
	VisitorWrapper (F func)
	Construct the wrapper. More...

Private Attributes
F	_func

Detailed Description

template<typename F>
struct lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F >

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 156 of file SchemaImpl.h.

Constructor & Destructor Documentation

template<typename F>

lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F >::VisitorWrapper ( F  func )

inlineexplicit

Construct the wrapper.

Definition at line 176 of file SchemaImpl.h.

: _func(func) {}

Member Function Documentation

template<typename F>

template<typename T >

void lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F >::operator() ( SchemaItem< T > const &  x ) const

inline

Call the wrapped function.

Definition at line 160 of file SchemaImpl.h.

{ _func(x); };

template<typename F>

void lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F >::operator() ( ItemVariant const &  v ) const

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 171 of file SchemaImpl.h.

                                                     {
            boost::apply_visitor(*this, v);
        }

Member Data Documentation

template<typename F>

F lsst::afw::table::detail::SchemaImpl::VisitorWrapper< F >::_func

private

Definition at line 179 of file SchemaImpl.h.

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The documentation for this struct was generated from the following file:

• /home/lsstsw/stack/Linux64/afw/11.0-2-g04d2804/include/lsst/afw/table/detail/SchemaImpl.h