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206 lines
6.8 KiB
206 lines
6.8 KiB
4 years ago
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/* -----------------------------------------------------------------------------
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* See the LICENSE file for information on copyright, usage and redistribution
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* of SWIG, and the README file for authors - http://www.swig.org/release.html.
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*
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* attribute.swg
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*
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* Attribute implementation
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* ----------------------------------------------------------------------------- */
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/*
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The following macros convert a pair of set/get methods
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into a "native" attribute.
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Use %attribute when you have a pair of get/set methods
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like in:
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%attribute(A, int, a, get_a, set_a);
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struct A
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{
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int get_a() const;
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void set_a(int aa);
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};
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If you don't provide a 'set' method, a 'read-only' attribute
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is generated, ie, like in:
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%attribute(A, int, c, get_c);
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Use %attributeref when you have const/non-const reference
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access methods, like in:
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%attributeref(A, int, b);
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struct A
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{
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const int& b() const;
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int& b();
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};
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%attributeref(B, int, c);
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struct B
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{
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int& c();
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};
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You can also use
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%attributeref(Class, AttributeType, AttributeName, AccessorMethod)
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if the internal C++ reference methods have a different name from the
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attribute you want, so
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%attributeref(B, int, d, c);
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is the same as the last example, but instead of the attribute 'c' being
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called 'c', it is called 'd'.
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Now you can use the attributes like so:
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x = A()
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x.a = 3 # calls A::set_a
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print x.a # calls A::get_a
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x.b = 3 # calls A::b()
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print x.b # calls A::b() const
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Use %attribute2 instead of %attribute to indicate that reference-pointer
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translation is required. You use %attribute2 instead of %attribute in
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cases like this:
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%attribute2(MyClass, MyFoo, Foo, GetFoo, SetFoo);
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%inline %{
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struct MyFoo {
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int x;
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};
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class MyClass {
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MyFoo foo;
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public:
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MyFoo& GetFoo() { return foo; }
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void SetFoo(const MyFoo& other) { foo = other; }
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};
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%}
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Here, the data type of the property is a wrapped type (MyFoo) and on the
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C++ side it is passed by reference. The problem is that the SWIG wrapper will
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pass around a pointer (MyFoo *) which is not compatible with the reference
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type of the accessors (MyFoo &). Therefore, if you use %attribute, you'll get
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an error from your C/C++ compiler. %attribute2 translates between a pointer
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and a reference to eliminate the error. In case you're confused, let's make it
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simple: just use %attribute at first, but if the C/C++ compiler gives an error
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while compiling the wrapper, try %attribute2 instead.
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NOTE: remember that if the type contains commas, such as 'std::pair<int,int>',
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you need to use the macro like:
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%attributeref(A, %arg(std::pair<int,int>), pval);
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where %arg() 'normalizes' the type to be understood as a single
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argument, otherwise the macro will get confused by the comma.
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*/
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//
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// Define SWIG_ATTRIBUTE_TEMPLATE if you want to use templates instead of macros for the C++ get and set wrapper methods
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// Does not always generate compileable code, use at your peril!
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//
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//#define SWIG_ATTRIBUTE_TEMPLATE
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%define %attribute_custom(Class, AttributeType, AttributeName, GetMethod, SetMethod, GetMethodCall, SetMethodCall)
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%ignore Class::GetMethod();
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%ignore Class::GetMethod() const;
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#if #SetMethod != #AttributeName
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%ignore Class::SetMethod;
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#endif
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%extend Class {
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AttributeType AttributeName;
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}
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#if defined(__cplusplus) && defined(SWIG_ATTRIBUTE_TEMPLATE)
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%{
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template < class C > inline AttributeType %mangle(Class) ##_## AttributeName ## _get(const C* self_) {
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return GetMethodCall;
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}
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template < class C > inline AttributeType %mangle(Class) ##_## AttributeName ## _get(C* self_) {
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return GetMethodCall;
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}
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template < class C > inline void %mangle(Class) ##_## AttributeName ## _set(C* self_, AttributeType val_) {
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SetMethodCall;
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}
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%}
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#else
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%{
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#define %mangle(Class) ##_## AttributeName ## _get(self_) GetMethodCall
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#define %mangle(Class) ##_## AttributeName ## _set(self_, val_) SetMethodCall
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%}
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#endif
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%enddef
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%define %attribute_readonly(Class, AttributeType, AttributeName, GetMethod, GetMethodCall)
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%ignore Class::GetMethod();
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%ignore Class::GetMethod() const;
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%immutable Class::AttributeName;
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%extend Class {
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AttributeType AttributeName;
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}
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#if defined(__cplusplus) && defined(SWIG_ATTRIBUTE_TEMPLATE)
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%{
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template < class C > inline AttributeType %mangle(Class) ##_## AttributeName ## _get(const C* self_) {
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return GetMethodCall;
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}
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template < class C > inline AttributeType %mangle(Class) ##_## AttributeName ## _get(C* self_) {
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return GetMethodCall;
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}
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%}
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#else
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%{
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#define %mangle(Class) ##_## AttributeName ## _get(self_) GetMethodCall
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%}
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#endif
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%enddef
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// User macros
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%define %attribute(Class, AttributeType, AttributeName, GetMethod, SetMethod...)
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#if #SetMethod != ""
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%attribute_custom(Class, AttributeType, AttributeName, GetMethod, SetMethod, self_->GetMethod(), self_->SetMethod(val_))
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#else
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%attribute_readonly(Class, AttributeType, AttributeName, GetMethod, self_->GetMethod())
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#endif
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%enddef
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%define %attribute2(Class, AttributeType, AttributeName, GetMethod, SetMethod...)
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#if #SetMethod != ""
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%attribute_custom(Class, AttributeType, AttributeName, GetMethod, SetMethod, &self_->GetMethod(), self_->SetMethod(*val_))
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#else
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%attribute_readonly(Class, AttributeType, AttributeName, GetMethod, &self_->GetMethod())
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#endif
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%enddef
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%define %attributeref(Class, AttributeType, AttributeName, AccessorMethod...)
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#if #AccessorMethod != ""
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%attribute_custom(Class, AttributeType, AttributeName, AccessorMethod, AccessorMethod, self_->AccessorMethod(), self_->AccessorMethod() = val_)
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#else
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%attribute_custom(Class, AttributeType, AttributeName, AttributeName, AttributeName, self_->AttributeName(), self_->AttributeName() = val_)
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#endif
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%enddef
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%define %attribute2ref(Class, AttributeType, AttributeName, AccessorMethod...)
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#if #AccessorMethod != ""
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%attribute_custom(Class, AttributeType, AttributeName, AccessorMethod, AccessorMethod, &self_->AccessorMethod(), self_->AccessorMethod() = *val_)
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#else
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%attribute_custom(Class, AttributeType, AccessorMethod, AccessorMethod, AccessorMethod, &self_->AccessorMethod(), self_->AccessorMethod() = *val_)
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#endif
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%enddef
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// deprecated (same as %attributeref, but there is an argument order inconsistency)
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%define %attribute_ref(Class, AttributeType, AccessorMethod, AttributeName...)
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#if #AttributeName != ""
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%attribute_custom(Class, AttributeType, AttributeName, AccessorMethod, AccessorMethod, self_->AccessorMethod(), self_->AccessorMethod() = val_)
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#else
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%attribute_custom(Class, AttributeType, AccessorMethod, AccessorMethod, AccessorMethod, self_->AccessorMethod(), self_->AccessorMethod() = val_)
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#endif
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%enddef
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