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bug 899859 - Add typed enums support in strutures / classes - r=Waldo

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This commit is contained in:
Guillaume Abadie 2013-08-02 20:51:00 -04:00
parent 5c7f83aa4c
commit 09ae0a3adc
1 changed files with 30 additions and 8 deletions
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38
mfbt/TypedEnum.h
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@ -92,16 +92,33 @@
* mandatory. As with MOZ_ENUM_TYPE(), it will do nothing on compilers that do
* not support it.
*
* Note that the workaround implemented here is not compatible with enums
* nested inside a class.
* MOZ_{BEGIN,END}_ENUM_CLASS doesn't work for defining enum classes nested
* inside classes. To define an enum class nested inside another class, use
* MOZ_{BEGIN,END}_NESTED_ENUM_CLASS, and place a MOZ_FINISH_NESTED_ENUM_CLASS
* in namespace scope to handle bits that can only be implemented with
* namespace-scoped code. For example:
*
* class FooBar {
*
* MOZ_BEGIN_NESTED_ENUM_CLASS(Enum, int32_t)
* A,
* B = 6
* MOZ_END_NESTED_ENUM_CLASS(Enum)
*
* };
*
* MOZ_FINISH_NESTED_ENUM_CLASS(FooBar::Enum)
*/
#if defined(MOZ_HAVE_CXX11_STRONG_ENUMS)
/*
* All compilers that support strong enums also support an explicit
* underlying type, so no extra check is needed.
*/
# define MOZ_BEGIN_ENUM_CLASS(Name, type) enum class Name : type {
# define MOZ_END_ENUM_CLASS(Name) };
# define MOZ_BEGIN_NESTED_ENUM_CLASS(Name, type) \
enum class Name : type {
# define MOZ_END_NESTED_ENUM_CLASS(Name) \
};
# define MOZ_FINISH_NESTED_ENUM_CLASS(Name) /* nothing */
#else
/**
* We need Name to both name a type, and scope the provided enumerator
@ -137,14 +154,14 @@
* {
* return Enum::A;
* }
*/
# define MOZ_BEGIN_ENUM_CLASS(Name, type) \
*/\
# define MOZ_BEGIN_NESTED_ENUM_CLASS(Name, type) \
class Name \
{ \
public: \
enum Enum MOZ_ENUM_TYPE(type) \
{
# define MOZ_END_ENUM_CLASS(Name) \
# define MOZ_END_NESTED_ENUM_CLASS(Name) \
}; \
Name() {} \
Name(Enum aEnum) : mEnum(aEnum) {} \
@ -152,7 +169,8 @@
operator Enum() const { return mEnum; } \
private: \
Enum mEnum; \
}; \
};
# define MOZ_FINISH_NESTED_ENUM_CLASS(Name) \
inline int operator+(const int&, const Name::Enum&) MOZ_DELETE; \
inline int operator+(const Name::Enum&, const int&) MOZ_DELETE; \
inline int operator-(const int&, const Name::Enum&) MOZ_DELETE; \
@ -208,6 +226,10 @@
inline int& operator<<=(int&, const Name::Enum&) MOZ_DELETE; \
inline int& operator>>=(int&, const Name::Enum&) MOZ_DELETE;
#endif
# define MOZ_BEGIN_ENUM_CLASS(Name, type) MOZ_BEGIN_NESTED_ENUM_CLASS(Name, type)
# define MOZ_END_ENUM_CLASS(Name) \
MOZ_END_NESTED_ENUM_CLASS(Name) \
MOZ_FINISH_NESTED_ENUM_CLASS(Name)
#endif /* __cplusplus */