Merge pull request #31 from s-ludwig/issue_15_ref_return
Let all TaggedAlgebraic operations return as auto ref
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bd26a94622
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@ -99,11 +99,11 @@ struct TaggedAlgebraic(U) if (is(U == union) || is(U == struct) || is(U == enum)
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// case.
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/// Enables the invocation of methods of the stored value.
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auto opDispatch(string name, this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.method, name, ARGS)) { return implementOp!(OpKind.method, name)(this, args); }
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auto ref opDispatch(string name, this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.method, name, ARGS)) { return implementOp!(OpKind.method, name)(this, args); }
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/// Enables accessing properties/fields of the stored value.
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@property auto opDispatch(string name, this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.field, name, ARGS) && !hasOp!(TA, OpKind.method, name, ARGS)) { return implementOp!(OpKind.field, name)(this, args); }
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@property auto ref opDispatch(string name, this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.field, name, ARGS) && !hasOp!(TA, OpKind.method, name, ARGS)) { return implementOp!(OpKind.field, name)(this, args); }
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/// Enables equality comparison with the stored value.
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auto opEquals(T, this TA)(auto ref T other)
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auto ref opEquals(T, this TA)(auto ref T other)
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if (is(Unqual!T == TaggedAlgebraic) || hasOp!(TA, OpKind.binary, "==", T))
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{
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static if (is(Unqual!T == TaggedAlgebraic)) {
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@ -111,23 +111,23 @@ struct TaggedAlgebraic(U) if (is(U == union) || is(U == struct) || is(U == enum)
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} else return implementOp!(OpKind.binary, "==")(this, other);
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}
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/// Enables relational comparisons with the stored value.
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auto opCmp(T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binary, "<", T)) { assert(false, "TODO!"); }
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auto ref opCmp(T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binary, "<", T)) { assert(false, "TODO!"); }
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/// Enables the use of unary operators with the stored value.
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auto opUnary(string op, this TA)() if (hasOp!(TA, OpKind.unary, op)) { return implementOp!(OpKind.unary, op)(this); }
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auto ref opUnary(string op, this TA)() if (hasOp!(TA, OpKind.unary, op)) { return implementOp!(OpKind.unary, op)(this); }
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/// Enables the use of binary operators with the stored value.
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auto opBinary(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binary, op, T)) { return implementOp!(OpKind.binary, op)(this, other); }
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auto ref opBinary(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binary, op, T)) { return implementOp!(OpKind.binary, op)(this, other); }
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/// Enables the use of binary operators with the stored value.
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auto opBinaryRight(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binaryRight, op, T) && !isInstanceOf!(TaggedAlgebraic, T)) { return implementOp!(OpKind.binaryRight, op)(this, other); }
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auto ref opBinaryRight(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binaryRight, op, T) && !isInstanceOf!(TaggedAlgebraic, T)) { return implementOp!(OpKind.binaryRight, op)(this, other); }
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/// ditto
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auto opBinaryRight(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binaryRight, op, T) && isInstanceOf!(TaggedAlgebraic, T) && !hasOp!(T, OpKind.opBinary, op, TA)) { return implementOp!(OpKind.binaryRight, op)(this, other); }
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auto ref opBinaryRight(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binaryRight, op, T) && isInstanceOf!(TaggedAlgebraic, T) && !hasOp!(T, OpKind.opBinary, op, TA)) { return implementOp!(OpKind.binaryRight, op)(this, other); }
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/// Enables operator assignments on the stored value.
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auto opOpAssign(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binary, op~"=", T)) { return implementOp!(OpKind.binary, op~"=")(this, other); }
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auto ref opOpAssign(string op, T, this TA)(auto ref T other) if (hasOp!(TA, OpKind.binary, op~"=", T)) { return implementOp!(OpKind.binary, op~"=")(this, other); }
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/// Enables indexing operations on the stored value.
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auto opIndex(this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.index, null, ARGS)) { return implementOp!(OpKind.index, null)(this, args); }
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auto ref opIndex(this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.index, null, ARGS)) { return implementOp!(OpKind.index, null)(this, args); }
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/// Enables index assignments on the stored value.
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auto opIndexAssign(this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.indexAssign, null, ARGS)) { return implementOp!(OpKind.indexAssign, null)(this, args); }
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auto ref opIndexAssign(this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.indexAssign, null, ARGS)) { return implementOp!(OpKind.indexAssign, null)(this, args); }
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/// Enables call syntax operations on the stored value.
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auto opCall(this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.call, null, ARGS)) { return implementOp!(OpKind.call, null)(this, args); }
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auto ref opCall(this TA, ARGS...)(auto ref ARGS args) if (hasOp!(TA, OpKind.call, null, ARGS)) { return implementOp!(OpKind.call, null)(this, args); }
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}
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///
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@ -825,7 +825,20 @@ unittest { // "in" operator
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assert(*("foo" in ta) == "bar");
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}
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private static auto implementOp(OpKind kind, string name, T, ARGS...)(ref T self, auto ref ARGS args)
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unittest { // issue #15 - by-ref return values
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static struct S {
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int x;
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ref int getx() { return x; }
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}
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static union U { S s; }
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alias TA = TaggedAlgebraic!U;
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auto ta = TA(S(10));
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assert(ta.x == 10);
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ta.getx() = 11;
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assert(ta.x == 11);
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}
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private static auto ref implementOp(OpKind kind, string name, T, ARGS...)(ref T self, auto ref ARGS args)
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{
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import std.array : join;
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import std.traits : CopyTypeQualifiers;
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@ -911,7 +924,7 @@ unittest { // opIndex on recursive TA with closed return value set using @disabl
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}
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private auto performOpRaw(U, OpKind kind, string name, T, ARGS...)(ref T value, /*auto ref*/ ARGS args)
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private auto ref performOpRaw(U, OpKind kind, string name, T, ARGS...)(ref T value, /*auto ref*/ ARGS args)
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{
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static if (kind == OpKind.binary) return mixin("value "~name~" args[0]");
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else static if (kind == OpKind.binaryRight) return mixin("args[0] "~name~" value");
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@ -932,7 +945,7 @@ unittest {
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}
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private auto performOp(U, OpKind kind, string name, T, ARGS...)(ref T value, /*auto ref*/ ARGS args)
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private auto ref performOp(U, OpKind kind, string name, T, ARGS...)(ref T value, /*auto ref*/ ARGS args)
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{
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import std.traits : isInstanceOf;
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static if (ARGS.length > 0 && isInstanceOf!(TaggedAlgebraic, ARGS[0])) {
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@ -1016,7 +1029,7 @@ private template OpInfo(U, OpKind kind, string name, ARGS...)
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}
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alias ReturnTypes = ReturnTypesImpl!0;
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static auto perform(T)(ref T value, auto ref ARGS args) { return performOp!(U, kind, name)(value, args); }
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static auto ref perform(T)(ref T value, auto ref ARGS args) { return performOp!(U, kind, name)(value, args); }
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}
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private template ImplicitUnqual(T) {
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