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fix issue 16070 - std.meta.{ApplyLeft,ApplyRight} fail with mixed typ… #4352

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fix issue 16070 - std.meta.{ApplyLeft,ApplyRight} fail with mixed typ… #4352

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54 changes: 30 additions & 24 deletions std/meta.d
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Original file line number Diff line number Diff line change
Expand Up @@ -1106,35 +1106,13 @@ unittest
*/
template ApplyLeft(alias Template, args...)
{
static if (args.length)
{
template ApplyLeft(right...)
{
static if (is(typeof(Template!(args, right))))
enum ApplyLeft = Template!(args, right); // values
else
alias ApplyLeft = Template!(args, right); // symbols
}
}
else
alias ApplyLeft = Template;
alias ApplyLeft(right...) = Template!(args, right);
}

/// Ditto
template ApplyRight(alias Template, args...)
{
static if (args.length)
{
template ApplyRight(left...)
{
static if (is(typeof(Template!(left, args))))
enum ApplyRight = Template!(left, args); // values
else
alias ApplyRight = Template!(left, args); // symbols
}
}
else
alias ApplyRight = Template;
alias ApplyRight(left...) = Template!(left, args);
}

///
Expand Down Expand Up @@ -1204,6 +1182,34 @@ unittest
typeof(&foo), typeof(&bar)) == SafeFunctions));
}

unittest // values
{
enum Templ1(int x) = x;
alias Partial1 = ApplyLeft!(Templ1, 1);
static assert(Partial1!() == 1);

enum Templ2(int x) = x;
alias Partial2 = ApplyLeft!Templ2;
static assert(Partial2!2 == 2);

enum Templ3(int a, double b, string c) = AliasSeq!(a, b, c);
alias Partial3 = ApplyLeft!(Templ3, 3, 3.3);
static assert(Partial3!"3" == AliasSeq!(3, 3.3, "3"));
}

unittest // issue 16070
{
alias Templ(T, string name) = AliasSeq!(T, name);
alias PartialL = ApplyLeft!(Templ, int);
alias FullL = PartialL!"foo";
static assert(is(FullL[0] == int));
static assert(FullL[1] == "foo");
alias PartialR = ApplyRight!(Templ, "bar");
alias FullR = PartialR!int;
static assert(is(FullR[0] == int));
static assert(FullR[1] == "bar");
}

/**
* Creates an `AliasSeq` which repeats a type or an `AliasSeq` exactly `n` times.
*/
Expand Down