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meta.trait.EnumMembers: Fix one-member enums 

Produce a tuple for an enum with only one member.
This commit is contained in:
Eugen Wissner 2018-09-15 06:06:17 +02:00
parent b831a05407
commit e5569e5fea
1 changed files with 24 additions and 5 deletions
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29
source/tanya/meta/trait.d
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@ -1601,7 +1601,7 @@ if (is(T == class) || is(T == struct) || is(T == union))
} }
/// ///
pure nothrow @safe unittest @nogc pure nothrow @safe unittest
{ {
static struct S static struct S
{ {
@ -2613,14 +2613,23 @@ if (is(T == enum))
} }
else else
{ {
alias getEnumMembers = AliasSeq!(__traits(getMember, T, Args[0]), getEnumMembers!(Args[1 .. $])); alias getEnumMembers = AliasSeq!(__traits(getMember, T, Args[0]),
getEnumMembers!(Args[1 .. $]));
} }
} }
alias EnumMembers = getEnumMembers!(__traits(allMembers, T)); private alias allMembers = AliasSeq!(__traits(allMembers, T));
static if (allMembers.length == 1)
{
alias EnumMembers = AliasSeq!(__traits(getMember, T, allMembers));
}
else
{
alias EnumMembers = getEnumMembers!allMembers;
}
} }
/// ///
pure nothrow @nogc @safe unittest @nogc nothrow pure @safe unittest
{ {
enum E : int enum E : int
{ {
@ -2628,7 +2637,17 @@ pure nothrow @nogc @safe unittest
two, two,
three, three,
} }
static assert([E.one, E.two, E.three] == [ EnumMembers!E ]); static assert([EnumMembers!E] == [E.one, E.two, E.three]);
}
// Produces a tuple for an enum with only one member
@nogc nothrow pure @safe unittest
{
enum E : int
{
one = 0,
}
static assert(EnumMembers!E == AliasSeq!0);
} }
/** /**