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Fix issue 6895 std.traits.isCovariantWith doesn't work for function, function pointer and delegate

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This commit is contained in:
Alexandru Caciulescu 2017-10-24 15:48:53 +03:00
parent 2d2592f538
commit 1d26b5fef7
1 changed files with 12 additions and 1 deletions
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13
std/traits.d
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@ -4885,7 +4885,9 @@ Determines whether the function type $(D F) is covariant with $(D G), i.e.,
functions of the type $(D F) can override ones of the type $(D G).
*/
template isCovariantWith(F, G)
if (is(F == function) && is(G == function))
if (is(F == function) && is(G == function) ||
is(F == delegate) && is(G == delegate) ||
isFunctionPointer!F && isFunctionPointer!G)
{
static if (is(F : G))
enum isCovariantWith = true;
@ -5031,6 +5033,15 @@ template isCovariantWith(F, G)
static assert( isCovariantWith!(DerivA_1.test, DerivA_1.test));
static assert( isCovariantWith!(DerivA_2.test, DerivA_2.test));
// function, function pointer and delegate
J function() derived_function;
I function() base_function;
J delegate() derived_delegate;
I delegate() base_delegate;
static assert(.isCovariantWith!(typeof(derived_function), typeof(base_function)));
static assert(.isCovariantWith!(typeof(*derived_function), typeof(*base_function)));
static assert(.isCovariantWith!(typeof(derived_delegate), typeof(base_delegate)));
// scope parameter
interface BaseB { void test( int*, int*); }
interface DerivB_1 : BaseB { override void test(scope int*, int*); }