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refs #345 Symmetric equality operators complete the original implementation of CValueObjectStdTuple.

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This commit is contained in:
Mathew Sutcliffe
2014-10-28 19:52:46 +00:00
parent 1a5856e34c
commit 8f7c10f306
3 changed files with 17 additions and 23 deletions
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17
src/blackmisc/valueobject.h
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@@ -278,6 +278,15 @@ namespace BlackMisc
*/
template <class Derived> class CValueObjectStdTuple : public CValueObject
{
friend bool operator ==(const Derived &a, const Derived &b)
{
return equals(a, b);
}
friend bool operator !=(const Derived &a, const Derived &b)
{
return !(a == b);
}
public:
//! \copydoc CValueObject::getValueHash()
@@ -362,6 +371,14 @@ namespace BlackMisc
private:
const Derived *derived() const { return static_cast<const Derived *>(this); }
Derived *derived() { return static_cast<Derived *>(this); }
// Friend functions are implemented in terms of private static member functions, because
// friendship is not transitive: friends of CValueObjectStdTuple are not friends of TupleConverter.
static bool equals(const Derived &a, const Derived &b)
{
if (&a == &b) { return true; }
return TupleConverter<Derived>::toMetaTuple(a) == TupleConverter<Derived>::toMetaTuple(b);
}
};
/*!