Move wrapper documentation to the wrap project

release/4.3a0
Varun Agrawal 2021-03-13 12:03:17 -05:00
parent 51be66ff14
commit 6016a2d764
1 changed files with 1 additions and 114 deletions

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* These are the current classes available through the matlab and python wrappers,
* add more functions/classes as they are available.
*
* IMPORTANT: the python wrapper supports keyword arguments for functions/methods. Hence, the
* argument names matter. An implementation restriction is that in overloaded methods
* or functions, arguments of different types *have* to have different names.
*
* Requirements:
* Classes must start with an uppercase letter
* - Can wrap a typedef
* Only one Method/Constructor per line, though methods/constructors can extend across multiple lines
* Methods can return
* - Eigen types: Matrix, Vector
* - C/C++ basic types: string, bool, size_t, int, double, char, unsigned char
* - void
* - Any class with which be copied with boost::make_shared()
* - boost::shared_ptr of any object type
* Constructors
* - Overloads are supported, but arguments of different types *have* to have different names
* - A class with no constructors can be returned from other functions but not allocated directly in MATLAB
* Methods
* - Constness has no effect
* - Specify by-value (not reference) return types, even if C++ method returns reference
* - Must start with a letter (upper or lowercase)
* - Overloads are supported
* Static methods
* - Must start with a letter (upper or lowercase) and use the "static" keyword
* - The first letter will be made uppercase in the generated MATLAB interface
* - Overloads are supported, but arguments of different types *have* to have different names
* Arguments to functions any of
* - Eigen types: Matrix, Vector
* - Eigen types and classes as an optionally const reference
* - C/C++ basic types: string, bool, size_t, size_t, double, char, unsigned char
* - Any class with which be copied with boost::make_shared() (except Eigen)
* - boost::shared_ptr of any object type (except Eigen)
* Comments can use either C++ or C style, with multiple lines
* Namespace definitions
* - Names of namespaces must start with a lowercase letter
* - start a namespace with "namespace {"
* - end a namespace with exactly "}"
* - Namespaces can be nested
* Namespace usage
* - Namespaces can be specified for classes in arguments and return values
* - In each case, the namespace must be fully specified, e.g., "namespace1::namespace2::ClassName"
* Includes in C++ wrappers
* - All includes will be collected and added in a single file
* - All namespaces must have angle brackets: <path>
* - No default includes will be added
* Global/Namespace functions
* - Functions specified outside of a class are global
* - Can be overloaded with different arguments
* - Can have multiple functions of the same name in different namespaces
* Using classes defined in other modules
* - If you are using a class 'OtherClass' not wrapped in this definition file, add "class OtherClass;" to avoid a dependency error
* Virtual inheritance
* - Specify fully-qualified base classes, i.e. "virtual class Derived : ns::Base {" where "ns" is the namespace
* - Mark with 'virtual' keyword, e.g. "virtual class Base {", and also "virtual class Derived : ns::Base {"
* - Forward declarations must also be marked virtual, e.g. "virtual class ns::Base;" and
* also "virtual class ns::Derived;"
* - Pure virtual (abstract) classes should list no constructors in this interface file
* - Virtual classes must have a clone() function in C++ (though it does not have to be included
* in the MATLAB interface). clone() will be called whenever an object copy is needed, instead
* of using the copy constructor (which is used for non-virtual objects).
* - Signature of clone function - will be called virtually, so must appear at least at the top of the inheritance tree
* virtual boost::shared_ptr<CLASS_NAME> clone() const;
* Class Templates
* - Basic templates are supported either with an explicit list of types to instantiate,
* e.g. template<T = {gtsam::Pose2, gtsam::Rot2, gtsam::Point3}> class Class1 { ... };
* or with typedefs, e.g.
* template<T, U> class Class2 { ... };
* typedef Class2<Type1, Type2> MyInstantiatedClass;
* - In the class definition, appearances of the template argument(s) will be replaced with their
* instantiated types, e.g. 'void setValue(const T& value);'.
* - To refer to the instantiation of the template class itself, use 'This', i.e. 'static This Create();'
* - To create new instantiations in other modules, you must copy-and-paste the whole class definition
* into the new module, but use only your new instantiation types.
* - When forward-declaring template instantiations, use the generated/typedefed name, e.g.
* class gtsam::Class1Pose2;
* class gtsam::MyInstantiatedClass;
* Boost.serialization within Matlab:
* - you need to mark classes as being serializable in the markup file (see this file for an example).
* - There are two options currently, depending on the class. To "mark" a class as serializable,
* add a function with a particular signature so that wrap will catch it.
* - Add "void serialize()" to a class to create serialization functions for a class.
* Adding this flag subsumes the serializable() flag below. Requirements:
* - A default constructor must be publicly accessible
* - Must not be an abstract base class
* - The class must have an actual boost.serialization serialize() function.
* - Add "void serializable()" to a class if you only want the class to be serialized as a
* part of a container (such as noisemodel). This version does not require a publicly
* accessible default constructor.
* Forward declarations and class definitions for Pybind:
* - Need to specify the base class (both this forward class and base class are declared in an external Pybind header)
* This is so Pybind can generate proper inheritance.
* Example when wrapping a gtsam-based project:
* // forward declarations
* virtual class gtsam::NonlinearFactor
* virtual class gtsam::NoiseModelFactor : gtsam::NonlinearFactor
* // class definition
* #include <MyFactor.h>
* virtual class MyFactor : gtsam::NoiseModelFactor {...};
* - *DO NOT* re-define overriden function already declared in the external (forward-declared) base class
* - This will cause an ambiguity problem in Pybind header file
* Pickle support in Python:
* - Add "void pickle()" to a class to enable pickling via gtwrap. In the current implementation, "void serialize()"
* and a public constructor with no-arguments in needed for successful build.
*/
/**
* Status:
* - TODO: default values for arguments
* - WORKAROUND: make multiple versions of the same function for different configurations of default arguments
* - TODO: Handle gtsam::Rot3M conversions to quaternions
* - TODO: Parse return of const ref arguments
* - TODO: Parse std::string variants and convert directly to special string
* - TODO: Add enum support
* - TODO: Add generalized serialization support via boost.serialization with hooks to matlab save/load
* Please refer to the wrapping docs: https://github.com/borglab/wrap/blob/master/README.md
*/
namespace gtsam {