39 lines
1.1 KiB
D
39 lines
1.1 KiB
D
module bubel.ecs.traits;
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import std.traits;
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bool isForeachDelegateWithTypes(DG, Types...)()
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{
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return is(DG == delegate) && is(ReturnType!DG == int) && is(Parameters!DG == Types);
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}
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unittest
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{
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assert(isForeachDelegateWithTypes!(int delegate(int, int), int, int));
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assert(isForeachDelegateWithTypes!(int delegate(ref int, ref int), int, int));
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assert(!isForeachDelegateWithTypes!(int delegate(double), int, int));
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}
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/************************************************************************************************************************
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Returns index of Component/Entity array in System's EntitiesData struct
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*/
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static long getIndexOfTypeInEntitiesData(EntitiesData, Type)()
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{
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alias EntitiesDataFields = Fields!(EntitiesData);
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long index = -1;
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foreach (fieldNum, FieldType; Fields!(EntitiesData))
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{
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static if (!isBasicType!(FieldType)) // Not basic type
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{
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// FieldType should be something like: 'const(SomeComponent)[]'
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enum bool entitiesMatches = is(Type == Unqual!(ForeachType!(FieldType)));
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static if (entitiesMatches)
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{
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index = fieldNum;
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break;
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}
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}
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}
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return index;
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}
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