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Use function pointers instead of std::function objects in static variant visitors

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This commit is contained in:
Peter Conrad 2018-11-04 13:54:05 +01:00
parent 9fa03c6786
commit 3c3b76920e
1 changed files with 26 additions and 20 deletions
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46
include/fc/static_variant.hpp
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@ -178,33 +178,39 @@ struct type_info<> {
} // namespace impl
template<typename Visitor,typename Data>
std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>> init_wrappers()
template<int L,typename Visitor,typename Data>
static const fc::array<typename Visitor::result_type(*)(Visitor&,Data),L>
init_wrappers( Visitor& v, Data d, typename Visitor::result_type(**funcs)(Visitor&,Data) = 0)
{
return std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>>();
return fc::array<typename Visitor::result_type(*)(Visitor&,Data),L>();
}
template<typename Visitor,typename Data, typename T, typename ... Types>
std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>> init_wrappers()
template<int L,typename Visitor,typename Data,typename T, typename ... Types>
static const fc::array<typename Visitor::result_type(*)(Visitor&,Data),L>
init_wrappers( Visitor& v, Data d, typename Visitor::result_type(**funcs)(Visitor&,Data) = 0 )
{
std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>> result
= init_wrappers<Visitor,Data,Types...>();
result.insert( result.begin(), [] ( Visitor& v, Data d ) { return v( *reinterpret_cast<T*>( d ) ); } );
fc::array<typename Visitor::result_type(*)(Visitor&,Data),L> result;
if( !funcs ) funcs = result.begin();
*funcs++ = [] ( Visitor& v, Data d ) { return v( *reinterpret_cast<T*>( d ) ); };
init_wrappers<L,Visitor,Data,Types...>( v, d, funcs );
return result;
}
template<typename Visitor,typename Data>
std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>> init_const_wrappers()
template<int L,typename Visitor,typename Data>
static const fc::array<typename Visitor::result_type(*)(Visitor&,Data),L>
init_const_wrappers( Visitor& v, Data d, typename Visitor::result_type(**funcs)(Visitor&,Data) = 0 )
{
return std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>>();
return fc::array<typename Visitor::result_type(*)(Visitor&,Data),L>();
}
template<typename Visitor,typename Data, typename T, typename ... Types>
std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>> init_const_wrappers()
template<int L,typename Visitor,typename Data,typename T, typename ... Types>
static const fc::array<typename Visitor::result_type(*)(Visitor&,Data),L>
init_const_wrappers( Visitor& v, Data d, typename Visitor::result_type(**funcs)(Visitor&,Data) = 0 )
{
std::vector<std::function<typename Visitor::result_type(Visitor&,Data)>> result
= init_const_wrappers<Visitor,Data,Types...>();
result.insert( result.begin(), [] ( Visitor& v, Data d ) { return v( *reinterpret_cast<const T*>( d ) ); } );
fc::array<typename Visitor::result_type(*)(Visitor&,Data),L> result;
if( !funcs ) funcs = result.begin();
*funcs++ = [] ( Visitor& v, Data d ) { return v( *reinterpret_cast<const T*>( d ) ); };
init_const_wrappers<L,Visitor,Data,Types...>( v, d, funcs );
return result;
}
@ -361,7 +367,7 @@ public:
template<typename visitor>
static typename visitor::result_type visit( tag_type tag, visitor& v, void* data )
{
static auto wrappers = init_wrappers<visitor,void*,Types...>();
static const auto wrappers = init_wrappers<impl::type_info<Types...>::count,visitor,void*,Types...>( v, data );
FC_ASSERT( tag >= 0 && tag < count(), "Unsupported type ${tag}!", ("tag",tag) );
return wrappers[tag]( v, data );
}
@ -369,7 +375,7 @@ public:
template<typename visitor>
static typename visitor::result_type visit( tag_type tag, const visitor& v, void* data )
{
static auto wrappers = init_wrappers<const visitor,void*,Types...>();
static const auto wrappers = init_wrappers<impl::type_info<Types...>::count,const visitor,void*,Types...>( v, data );
FC_ASSERT( tag >= 0 && tag < count(), "Unsupported type ${tag}!", ("tag",tag) );
return wrappers[tag]( v, data );
}
@ -377,7 +383,7 @@ public:
template<typename visitor>
static typename visitor::result_type visit( tag_type tag, visitor& v, const void* data )
{
static auto wrappers = init_const_wrappers<visitor,const void*,Types...>();
static const auto wrappers = init_const_wrappers<impl::type_info<Types...>::count,visitor,const void*,Types...>( v, data );
FC_ASSERT( tag >= 0 && tag < count(), "Unsupported type ${tag}!", ("tag",tag) );
return wrappers[tag]( v, data );
}
@ -385,7 +391,7 @@ public:
template<typename visitor>
static typename visitor::result_type visit( tag_type tag, const visitor& v, const void* data )
{
static auto wrappers = init_const_wrappers<const visitor,const void*,Types...>();
static const auto wrappers = init_const_wrappers<impl::type_info<Types...>::count,const visitor,const void*,Types...>( v, data );
FC_ASSERT( tag >= 0 && tag < count(), "Unsupported type ${tag}!", ("tag",tag) );
return wrappers[tag]( v, data );
}