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Allow wrap const member function #64

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Allow wrap const member function #64

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2 changes: 1 addition & 1 deletion examples/native_peer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ extern "C" JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void*)
Calculator(const Calculator&) = delete; // noncopyable
~Calculator() { std::cout << "Native peer finalized" << std::endl; }

jni::jlong Add(jni::JNIEnv&, jni::jlong a, jni::jlong b) { return a + b; }
jni::jlong Add(jni::JNIEnv&, jni::jlong a, jni::jlong b) const { return a + b; }
jni::jlong Subtract(jni::JNIEnv&, jni::jlong a, jni::jlong b) { return a - b; }
};

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25 changes: 25 additions & 0 deletions include/jni/native_method.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -282,6 +282,31 @@ namespace jni
}
};

template < class R, class P, class... Args, R (P::*method)(JNIEnv&, Args...) const>
class NativePeerMemberFunctionMethod< R (P::*)(JNIEnv&, Args...) const, method>
{
private:
const char* name;

public:
NativePeerMemberFunctionMethod(const char* n)
: name(n)
{}

template < class Peer, class TagType, class = std::enable_if_t< std::is_same<P, Peer>::value > >
auto operator()(const Field<TagType, jlong>& field)
{
auto wrapper = [field] (JNIEnv& env, Object<TagType>& obj, Args... args)
{
auto ptr = reinterpret_cast<P*>(obj.Get(env, field));
if (ptr) return (ptr->*method)(env, args...);
ThrowNew(env, jni::FindClass(env, "java/lang/IllegalStateException"),
"invalid native peer");
};
return MakeNativeMethod(name, wrapper);
}
};

template < class M, M method>
auto MakeNativePeerMethod(const char* name,
std::enable_if_t< std::is_member_function_pointer<M>::value >* = nullptr)
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