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Fixed covariance check (function safety).

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This commit is contained in:
Shin Fujishiro 2010-05-23 01:07:22 +00:00
parent 19166286a7
commit 1e204c9b9a
1 changed files with 21 additions and 7 deletions
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28
std/traits.d
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@ -1536,7 +1536,7 @@ private template isCovariantWithImpl(Upr, Lwr)
* Check for function attributes:
* - require exact match for ref and @property
* - overrider can add pure and nothrow, but can't remove them
* - trust: ?
* - @safe and @trusted are covariant with each other, unremovable
*/
template checkAttributes()
{
@ -1545,12 +1545,12 @@ private template isCovariantWithImpl(Upr, Lwr)
enum lwrAtts = functionAttributes!(Lwr);
//
enum WANT_EXACT = FA.REF | FA.PROPERTY;
enum TRUST = FA.SAFE | FA.TRUSTED;
enum SAFETY = FA.SAFE | FA.TRUSTED;
enum ok =
((uprAtts & WANT_EXACT) == (lwrAtts & WANT_EXACT)) &&
((uprAtts & FA.PURE ) >= (lwrAtts & FA.PURE )) &&
((uprAtts & FA.NOTHROW) >= (lwrAtts & FA.NOTHROW)) &&
((uprAtts & TRUST ) >= (lwrAtts & TRUST )) ; // XXX
( (uprAtts & WANT_EXACT) == (lwrAtts & WANT_EXACT)) &&
( (uprAtts & FA.PURE ) >= (lwrAtts & FA.PURE )) &&
( (uprAtts & FA.NOTHROW) >= (lwrAtts & FA.NOTHROW)) &&
(!!(uprAtts & SAFETY ) >= !!(lwrAtts & SAFETY )) ;
}
/*
* Check for return type: usual implicit convertion.
@ -1643,7 +1643,7 @@ unittest
static assert(isCovariantWith!(DerivC_1.test, BaseC.test));
static assert(! isCovariantWith!(BaseC.test, DerivC_1.test));
// trust
// increasing safety
interface BaseE { void test() ; }
interface DerivE_1 : BaseE { override void test() @safe ; }
interface DerivE_2 : BaseE { override void test() @trusted; }
@ -1651,6 +1651,20 @@ unittest
static assert(isCovariantWith!(DerivE_2.test, BaseE.test));
static assert(! isCovariantWith!(BaseE.test, DerivE_1.test));
static assert(! isCovariantWith!(BaseE.test, DerivE_2.test));
// @safe and @trusted
interface BaseF
{
void test1() @safe;
void test2() @trusted;
}
interface DerivF : BaseF
{
override void test1() @trusted;
override void test2() @safe;
}
static assert(isCovariantWith!(DerivF.test1, BaseF.test1));
static assert(isCovariantWith!(DerivF.test2, BaseF.test2));
}