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Bug 987305 - Add BitFlagsEnumSerializer - r=nfroyd

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This commit is contained in:
Benoit Jacob 2014-04-25 22:34:04 -04:00
parent 832536704e
commit 4f3f6b3a15
1 changed files with 59 additions and 0 deletions
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59
ipc/glue/IPCMessageUtils.h
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@ -155,6 +155,26 @@ public:
}
};
template <typename E,
E AllBits>
struct BitFlagsEnumValidator
{
static bool IsLegalValue(E e)
{
return (e & AllBits) == e;
}
};
template <typename E,
MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) AllBits>
struct BitFlagsTypedEnumValidator
{
static bool IsLegalValue(E e)
{
return (e & AllBits) == e;
}
};
/**
* Specialization of EnumSerializer for enums with contiguous enum values.
*
@ -192,6 +212,45 @@ struct ContiguousTypedEnumSerializer
ContiguousTypedEnumValidator<E, MinLegal, HighBound>>
{};
/**
* Specialization of EnumSerializer for enums representing bit flags.
*
* Provide one value: AllBits. An enum value x will be
* considered legal if (x & AllBits) == x;
*
* Example:
* \code
* enum FOO {
* FOO_FIRST = 1 << 0,
* FOO_SECOND = 1 << 1,
* FOO_LAST = 1 << 2,
* ALL_BITS = (1 << 3) - 1
* };
*
* template <>
* struct ParamTraits<FOO>:
* public BitFlagsEnumSerializer<FOO, FOO::ALL_BITS> {};
* \endcode
*/
template <typename E,
E AllBits>
struct BitFlagsEnumSerializer
: EnumSerializer<E,
BitFlagsEnumValidator<E, AllBits>>
{};
/**
* Similar to BitFlagsEnumSerializer, but for MFBT typed enums
* as constructed by MOZ_BEGIN_ENUM_CLASS. This can go away when
* we drop MOZ_BEGIN_ENUM_CLASS and use C++11 enum classes directly.
*/
template <typename E,
MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(E) AllBits>
struct BitFlagsTypedEnumSerializer
: EnumSerializer<E,
BitFlagsTypedEnumValidator<E, AllBits>>
{};
template <>
struct ParamTraits<base::ChildPrivileges>
: public ContiguousEnumSerializer<base::ChildPrivileges,