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June 16, 2011 smarter reflection issue | ||||
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I have a MemberDesc class which describe a class's members. I fill it with a template method like that (with GETTER and SETTER some other templated method I wrote) ===== MemberDesc MEMBER(T, string memberName)() { TypeInfo ti = typeid( typeof(__traits(getMember, T, memberName)) ); Variant function(Object target) getter = null; getter = &GETTER!(T, memberName); void function(Object target, Variant value) setter = null; setter = &SETTER!(T, memberName); return new MemberDesc(memberName, ti , getter, setter); } ===== And it works except that I don't do any check that the setter / getter method exist! I tried something like that ==== static if( __traits(compiles, __traits(getMember, T, member)) ) { getter = &GETTER!(T, memberName); } ==== but this always fail... mm.. how could I check for the getter? and i guess it's even harder for the setter! how about something like that (how to fix it?) ===== static if( __traits(compiles, __traits(getMember, T, member) = typeof(__traits(getMember, T, memberName)).init) ) { setter = &SETTER!(T, memberName); } ===== |
June 16, 2011 Re: smarter reflection issue | ||||
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Posted in reply to Lloyd Dupont | MemberDesc MEMBER(T, string memberName)() if(std.traits.hasMember!(T, memberName))
{
...
}
Lloyd Dupont Wrote:
> I have a MemberDesc class which describe a class's members.
> I fill it with a template method like that (with GETTER and SETTER some
> other templated method I wrote)
> =====
> MemberDesc MEMBER(T, string memberName)()
> {
> TypeInfo ti = typeid( typeof(__traits(getMember, T, memberName)) );
>
> Variant function(Object target) getter = null;
> getter = &GETTER!(T, memberName);
>
>
> void function(Object target, Variant value) setter = null;
> setter = &SETTER!(T, memberName);
>
> return new MemberDesc(memberName, ti , getter, setter);
> }
> =====
>
> And it works except that I don't do any check that the setter / getter method exist!
>
> I tried something like that
> ====
> static if( __traits(compiles, __traits(getMember, T, member)) )
> {
> getter = &GETTER!(T, memberName);
> }
> ====
>
> but this always fail... mm.. how could I check for the getter?
>
>
> and i guess it's even harder for the setter!
> how about something like that (how to fix it?)
> =====
> static if( __traits(compiles, __traits(getMember, T, member) =
> typeof(__traits(getMember, T, memberName)).init) )
> {
> setter = &SETTER!(T, memberName);
> }
> =====
>
|
June 16, 2011 Re: smarter reflection issue | ||||
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Posted in reply to Jesse Phillips | Hi Jesse, this won't work! It's my fault in not explaining my problem well though... I forget to mention something... I'm using property syntax and try to call the method Say I have ===== private int _foo; @property public int Foo() { return _foo; } @property public void Foo(int value) { _foo = value; } ===== if I call MEMBER(MyClass, "Foo") I'd like to do some static test for "int Foo()" and "void Foo(int)" So... how will I go on solving that? "Jesse Phillips" wrote in message news:itdqs4$mv0$1@digitalmars.com... MemberDesc MEMBER(T, string memberName)() if(std.traits.hasMember!(T, memberName)) { ... } Lloyd Dupont Wrote: > I have a MemberDesc class which describe a class's members. > I fill it with a template method like that (with GETTER and SETTER some > other templated method I wrote) > ===== > MemberDesc MEMBER(T, string memberName)() > { > TypeInfo ti = typeid( typeof(__traits(getMember, T, memberName)) ); > > Variant function(Object target) getter = null; > getter = &GETTER!(T, memberName); > > > void function(Object target, Variant value) setter = null; > setter = &SETTER!(T, memberName); > > return new MemberDesc(memberName, ti , getter, setter); > } > ===== > > And it works except that I don't do any check that the setter / getter > method exist! > > I tried something like that > ==== > static if( __traits(compiles, __traits(getMember, T, member)) ) > { > getter = &GETTER!(T, memberName); > } > ==== > > but this always fail... mm.. how could I check for the getter? > > > and i guess it's even harder for the setter! > how about something like that (how to fix it?) > ===== > static if( __traits(compiles, __traits(getMember, T, member) = > typeof(__traits(getMember, T, memberName)).init) ) > { > setter = &SETTER!(T, memberName); > } > ===== > |
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