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Bug 767240 - Make it easier to create type-specific scoped pointers (TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE), r=jwalden

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--HG--
extra : rebase_source : 845b429d56ee1abb296925624928c355451edc3c
This commit is contained in:
Brian Smith 2012-07-24 15:36:06 -07:00
parent 34f84dc755
commit 4d35e2a589
1 changed files with 45 additions and 4 deletions
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49
mfbt/Scoped.h
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@ -43,10 +43,11 @@
*
* Extension:
*
* In addition, this header provides class |Scoped| and macro |SCOPED_TEMPLATE|
* to simplify the definition of RAII classes for other scenarios. These macros
* have been used to automatically close file descriptors/file handles when
* reaching the end of the scope, graphics contexts, etc.
* In addition, this header provides class |Scoped| and macros |SCOPED_TEMPLATE|
* and |MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE| to simplify the definition
* of RAII classes for other scenarios. These macros have been used to
* automatically close file descriptors/file handles when reaching the end of
* the scope, graphics contexts, etc.
*/
#include "mozilla/Attributes.h"
@ -223,6 +224,46 @@ struct ScopedDeleteArrayTraits : public ScopedFreePtrTraits<T>
};
SCOPED_TEMPLATE(ScopedDeleteArray, ScopedDeleteArrayTraits)
/*
* MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE makes it easy to create scoped
* pointers for types with custom deleters; just overload
* TypeSpecificDelete(T*) in the same namespace as T to call the deleter for
* type T.
*
* @param name The name of the class to define.
* @param Type A struct implementing clean-up. See the implementations
* for more details.
* *param Deleter The function that is used to delete/destroy/free a
* non-null value of Type*.
*
* Example:
*
* MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE(ScopedPRFileDesc, PRFileDesc, \
* PR_Close)
* ...
* {
* ScopedPRFileDesc file(PR_OpenFile(...));
* ...
* } // file is closed with PR_Close here
*/
#define MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE(name, Type, Deleter) \
inline void TypeSpecificDelete(Type * value) { Deleter(value); } \
typedef ::mozilla::TypeSpecificScopedPointer<Type> name;
template <typename T>
struct TypeSpecificScopedPointerTraits
{
typedef T* type;
const static type empty() { return NULL; }
const static void release(type value)
{
if (value)
TypeSpecificDelete(value);
}
};
SCOPED_TEMPLATE(TypeSpecificScopedPointer, TypeSpecificScopedPointerTraits)
} /* namespace mozilla */
#endif // mozilla_Scoped_h_