Add Add HashMap with dependices from mutils

source/ecs/traits.d

@@ -0,0 +1,39 @@
+module ecs.traits;
+
+import std.traits;
+
+bool isForeachDelegateWithI(DG)() {
+	return is(DG == delegate) && is(ReturnType!DG == int)
+		&& Parameters!DG.length == 2 && isIntegral!(Parameters!(DG)[0]);
+}
+
+unittest {
+	assert(isForeachDelegateWithI!(int delegate(int, double)));
+	assert(isForeachDelegateWithI!(int delegate(int, double) @nogc nothrow));
+	assert(!isForeachDelegateWithI!(int delegate(double, double)));
+}
+
+bool isForeachDelegateWithoutI(DG)() {
+	return is(DG == delegate) && is(ReturnType!DG == int) && Parameters!DG.length == 1;
+}
+
+unittest {
+	assert(isForeachDelegateWithoutI!(int delegate(int)));
+	assert(isForeachDelegateWithoutI!(int delegate(size_t) @nogc nothrow));
+	assert(!isForeachDelegateWithoutI!(void delegate(int)));
+}
+
+bool isForeachDelegateWithTypes(DG, Types...)() {
+	return is(DG == delegate) && is(ReturnType!DG == int) && is(Parameters!DG == Types);
+}
+
+unittest {
+	assert(isForeachDelegateWithTypes!(int delegate(int, int), int, int));
+	assert(isForeachDelegateWithTypes!(int delegate(ref int, ref int), int, int));
+	assert(!isForeachDelegateWithTypes!(int delegate(double), int, int));
+}
+
+auto assumeNoGC(T)(T t) if (isFunctionPointer!T || isDelegate!T) {
+	enum attrs = functionAttributes!T | FunctionAttribute.nogc;
+	return cast(SetFunctionAttributes!(T, functionLinkage!T, attrs)) t;
+}