benn/lumiera_documentation
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

idea for better organisation of the template specialisations

Browse source
This commit is contained in:
Fischlurch 2011-06-05 19:11:46 +02:00
parent a8fd0bf7c5
commit d39ae8afc6
1 changed files with 103 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

106
src/lib/time/control.hpp
View file

@ -94,6 +94,9 @@ namespace time {
using std::tr1::ref;
template<class TI>
struct Mutabor;
/**
* Implementation building block: impose changes to a Time element.
@ -120,6 +123,8 @@ namespace time {
template<class SRC, class TAR>
struct MutationPolicy;
friend class Mutabor<TI>;
protected:
mutable ValueSetter setVal_;
@ -145,7 +150,75 @@ namespace time {
};
template<class TI>
struct Mutabor
{
static void
imposeChange (TimeValue& target, TI const& newVal)
{
Mutator<TI>::imposeChange (target,newVal);
}
};
template<class TI, class TAR>
struct Builder
{
static TI
buildChangedValue (TAR& target, TI const&)
{
return TI(target);
}
};
template<class TAR>
struct Builder<TimeSpan, TAR>
{
static TimeSpan
buildChangedValue (TAR& target, TimeSpan const& newVal)
{
return TimeSpan (target, newVal.duration());
}
};
#ifdef LIB_TIME_TIMEQUQNT_H
template<class TAR>
struct Builder<QuTime, TAR>
{
static QuTime
buildChangedValue (TAR& target, QuTime const&)
{
return QuTime (target
,getDefaultGridFallback() //////////////////TICKET #810
);
}
};
#endif
template<class TI, class TAR>
struct Adap
: Mutabor<TI>
, Builder<TI,TAR>
{
static TI
imposeValueChange (TAR& target, TI const& newVal)
{
imposeChange (target,newVal);
return buildChangedValue(target,newVal);
}
};
template<class TI, class SRC, class TAR>
struct Policy
{
static function<TI(TI const&)>
buildChangeHandler (TAR& target)
{
return bind (Adap<TI,TAR>::imposeValueChange, ref(target), _1 );
}
};
template<class TI>
TI
Mutator<TI>::imposeValueChange (TimeValue& target, TI const& newVal)
@ -243,10 +316,36 @@ namespace time {
#endif //(End)quantisation special case
namespace { // metaprogramming helpers to pick the suitable Instantiation...
template<class T>
struct isDuration
{
static const bool value = is_sameType<T,Duration>::value;
};
template<class T>
struct isTimeSpan
{
static const bool value = is_sameType<T,TimeSpan>::value;
};
template<class T>
struct isQuTime
{
static const bool value = is_sameType<T,QuTime>::value;
};
template<class T>
struct isSpecialCase
{
static const bool value = isDuration<T>::value;
};
}
template<class TI>
template<class TAR>
struct Mutator<TI>::MutationPolicy<typename disable_if< is_sameType<TAR,Duration>, TI>::type, TAR>
struct Mutator<TI>::MutationPolicy< typename disable_if< isSpecialCase<TAR>,
TI>::type, TAR>
{
static function<TI(TI const&)>
buildChangeHandler (TAR& target)
@ -282,7 +381,8 @@ namespace time {
template<class TI>
template<class TAR>
struct Mutator<TI>::MutationPolicy<typename enable_if< is_sameType<TAR,Duration>, TI>::type, TAR>
struct Mutator<TI>::MutationPolicy< typename enable_if< isDuration<TAR>,
TI>::type, TAR>
{
static function<TI(TI const&)>
buildChangeHandler (Duration& target)
@ -323,7 +423,7 @@ namespace time {
void
Mutator<TI>::bind_to (TAR& target) const
{
setVal_ = MutationPolicy<TI,TAR> ::buildChangeHandler (target);
setVal_ = Policy<TI,TI,TAR>::buildChangeHandler(target); //MutationPolicy<TI,TAR> ::buildChangeHandler (target);
offset_ = MutationPolicy<Offset,TAR>::buildChangeHandler (target);
nudge_ = MutationPolicy<int,TAR> ::buildChangeHandler (target);
}