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Rename AP_Meta_class::AP_Type_id to AP_Meta_class::Type_id in keeping with the coding standard. 

Add a non-static version of AP_Meta_class::meta_cast that can be used against any subclass object directly.

git-svn-id: https://arducopter.googlecode.com/svn/trunk@1539 f9c3cf11-9bcb-44bc-f272-b75c42450872
This commit is contained in:
DrZiplok@gmail.com 2011-01-23 23:46:58 +00:00
parent 8c9ece1f37
commit 2f263229f9
1 changed files with 22 additions and 6 deletions
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28
libraries/AP_Common/AP_MetaClass.h
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@ -48,7 +48,7 @@ public:
/// ///
/// See ::meta_type_id for a discussion of class type IDs. /// See ::meta_type_id for a discussion of class type IDs.
/// ///
typedef uint16_t AP_Type_id; typedef uint16_t Type_id;
/// Obtain a value unique to all instances of a specific subclass. /// Obtain a value unique to all instances of a specific subclass.
/// ///
@ -68,21 +68,21 @@ public:
/// ///
/// @return A type-unique value for this. /// @return A type-unique value for this.
/// ///
AP_Type_id meta_type_id(void) const { Type_id meta_type_id(void) const {
return *(AP_Type_id *)this; return *(Type_id *)this;
} }
/// Obtain a value unique to all instances of a named subclass. /// Obtain a value unique to all instances of a named subclass.
/// ///
/// This is similar to ::meta_type_id, but is a template taking a class name. /// This is similar to ::meta_type_id, but is a template taking a class name.
/// Use this function to cache the AP_Type_id for a class when you don't need /// Use this function to cache the Type_id for a class when you don't need
/// or cannot afford the constructor cost associated with meta_cast. /// or cannot afford the constructor cost associated with meta_cast.
/// ///
/// @tparam T A subclass of AP_Meta_class. /// @tparam T A subclass of AP_Meta_class.
/// @return The AP_Type_id value for T. /// @return The Type_id value for T.
/// ///
template<typename T> template<typename T>
static AP_Type_id meta_type_id(void) { static Type_id meta_type_id(void) {
T tmp; T tmp;
return tmp.meta_type_id(); return tmp.meta_type_id();
} }
@ -198,6 +198,22 @@ public:
return NULL; return NULL;
} }
/// Cast this to an expected class type.
///
/// This is equivalent to meta_cast<T>(this)
///
/// @tparam T The name of a type to which this is to be cast.
/// @return NULL if this is not of precisely type T, otherwise this cast to T.
///
template<typename T>
T *meta_cast(void) {
T tmp;
if (meta_type_equivalent(this, &tmp)) {
return (T*)this;
}
return NULL;
}
/// Serialize the class. /// Serialize the class.
/// ///
/// Serialization stores the state of the class in an external buffer in such a /// Serialization stores the state of the class in an external buffer in such a