Opaque Class Reference

Description

opaque private data structure to apply the diff.

This class offers to build a binding for diff messages, which basically maps its internal structures onto the generic "object" scheme underlying the diff language.

Definition at line 86 of file diff-complex-application-test.cpp.

Public Member Functions
	Opaque (string keyID)
	Opaque (idi::BareEntryID id)
	Opaque (Opaque const &o)
void	buildMutator (TreeMutator::Handle buff)
	the only way this opaque object exposes itself for mutation through diff messages. More...
string	identity () const
bool	isTyped () const
const Opaque *	nestedDelta () const
const Opaque *	nestedObj_1 () const
	operator string () const
Opaque &	operator= (Opaque const &o)
bool	verifyAlpha (int x) const
bool	verifyBeta (int64_t x) const
bool	verifyData (string desc) const
bool	verifyGamma (double x) const
bool	verifyType (string x) const

Friends
constexpr size_t	treeMutatorSize (const Opaque *)
	override default size traits to allow for sufficient buffer, able to hold the mutator defined above.

Private Attributes
int	alpha_ = -1
int64_t	beta_ = -1
unique_ptr< Opaque >	delta_
double	gamma_ = -1
idi::BareEntryID	key_
vector< string >	nestedData_
vector< Opaque >	nestedObj_
string	type_ = Rec::TYPE_NIL

Member Function Documentation

buildMutator()

void buildMutator ( TreeMutator::Handle  buff )

inline

the only way this opaque object exposes itself for mutation through diff messages.

This function builds a TreeMutator implementation into the given buffer space

Note

some crucial details for this binding to work properly...

• we define several "onion layers" of binding to deal with various scopes.
• the priority of these bindings is layered backwards from lowest to highest, i.e. the resulting mutator will fist check for attribute δ and then work its way down do the collection(nestedData_)
• actually this is a quite complicated setup, including object fields to represent attributes, where only one specific attribute actually holds a nested object and thus needs special treatment; beyond that we have both a collection of child objects and a collection of child data values
• the selector predicate (isApplicableIf) actually decides if a binding layer becomes responsible for a given diff verb. Here, this decision is based on the classification of the verb or spec to be handled, either being an attribute (named, key-value pair), a nested sub-scope ("object") and finally just any unnamed (non attribute) value
• the recursive mutation of nested scopes is simply initiated by invoking the same Opaque::buildMutator on the respective children recursively.
• such an unusually complicated TreeMutator binding leads to increased buffer space requirements for the actual TreeMutator to be generated; Thus we need to implement the extension point treeMutatorSize() to supply a sufficient buffer size value. This function is picked up through ADL, based on the target type Opaque

Definition at line 202 of file diff-complex-application-test.cpp.

References TreeMutator::build(), Opaque::buildMutator(), lib::diff::anonymous_namespace{tree-mutator-collection-binding.hpp}::collection(), PlantingHandle< BA, DEFAULT >::emplace(), DataCap::isNested(), and lib::diff::anonymous_namespace{test-mutation-target.hpp}::render().

Referenced by Opaque::buildMutator().

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The documentation for this class was generated from the following file:

• diff-complex-application-test.cpp