96 lines
No EOL
2.8 KiB
D
96 lines
No EOL
2.8 KiB
D
/************************************************************************************************************************
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Copyright: Copyright © 2018-2019, Dawid Masiukiewicz, Michał Masiukiewicz
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License: BSD 3-clause, see LICENSE file in project root folder.
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*/
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module bubel.ecs.traits;
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import std.traits;
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/************************************************************************************************************************
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Return Component/System/Event unique ID
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*/
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ref ushort becsID(T)()
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{
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/// Embed id in struct so export can be added to variable definition
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static struct LocalStruct {
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export __gshared ushort id = ushort.max;
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}
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return LocalStruct.id;
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}
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/************************************************************************************************************************
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Return Component/System/Event unique ID
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*/
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ref ushort becsID(T)(T obj)
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{
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static if(isPointer!T)return becsID!(PointerTarget!T);
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else return becsID!T;
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}
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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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static string attachParentName(alias T, string str)()
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{
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alias parent = __traits(parent, T);
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enum parent_str = parent.stringof;
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static if(parent_str[0..7] == "module ")
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{
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static if(__traits(compiles, __traits(parent, parent)))
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{
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return attachParentName!(parent, parent_str[7 .. $] ~ '.' ~ str);
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}
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else return parent_str[7 .. $] ~ '.' ~ str;
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}
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else static if(parent_str[0..8] == "package ")
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{
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static if(__traits(compiles, __traits(parent, parent)))
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{
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return attachParentName!(parent, parent_str[8 .. $] ~ '.' ~ str);
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}
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else return parent_str[8 .. $] ~ '.' ~ str;
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}
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else static if(__traits(compiles, __traits(parent, parent)))
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{
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return attachParentName!(parent, parent_str ~ '.' ~ str);
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}
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else return parent_str ~ '.' ~ str;
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}
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static string fullName(T)()
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{
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return attachParentName!(T, T.stringof);
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} |