6b361bf050
This works by transferring ownership of the underlying C++ memory from the target language proxy class to an instance of the unique_ptr which is passed to the wrapped function via std::move. The proxy class has a new swigRelease() method which sets the underlying C++ pointer for the proxy class to null, so working in much the same way as std::unique_ptr::release(). Any attempt at using the proxy class will be the same as if the delete() function has been called on the proxy class. That is, using a C++ null pointer, when a non-null pointer is usually expected. This commit relies on the previous commit that uses std::move on the temporary variable used for the wrapped function's input parameter as std::unique_ptr is not copyable, it has move-only semantics.
52 lines
1.6 KiB
OpenEdge ABL
52 lines
1.6 KiB
OpenEdge ABL
/* -----------------------------------------------------------------------------
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* std_unique_ptr.i
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*
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* The typemaps here allow handling functions returning std::unique_ptr<>,
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* which is the most common use of this type. If you have functions taking it
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* as parameter, these typemaps can't be used for them and you need to do
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* something else (e.g. use shared_ptr<> which SWIG supports fully).
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* ----------------------------------------------------------------------------- */
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%define %unique_ptr(TYPE)
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%typemap (jni) std::unique_ptr< TYPE > "jlong"
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%typemap (jtype) std::unique_ptr< TYPE > "long"
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%typemap (jstype) std::unique_ptr< TYPE > "$typemap(jstype, TYPE)"
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%typemap(in) std::unique_ptr< TYPE > (TYPE *unique_temp)
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%{ unique_temp = *(TYPE **)&$input;
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$1.reset(unique_temp); %}
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%typemap(javain) std::unique_ptr< TYPE > "$typemap(jstype, TYPE).swigRelease($javainput)"
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%typemap (out) std::unique_ptr< TYPE > %{
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jlong lpp = 0;
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*(TYPE **) &lpp = $1.release();
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$result = lpp;
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%}
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%typemap(javaout) std::unique_ptr< TYPE > {
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long cPtr = $jnicall;
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return (cPtr == 0) ? null : new $typemap(jstype, TYPE)(cPtr, true);
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}
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%typemap(javarelease) TYPE %{
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protected static long swigRelease($javaclassname obj) {
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long ptr = 0;
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if (obj != null) {
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if (!obj.swigCMemOwn)
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throw new RuntimeException("Cannot release ownership as memory is not owned");
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ptr = obj.swigCPtr;
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obj.swigCMemOwn = false;
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obj.delete();
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}
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return ptr;
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}
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%}
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%template() std::unique_ptr< TYPE >;
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%enddef
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namespace std {
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template <class T> class unique_ptr {};
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}
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