Clang AST - convert pointer to reference? [C++] - c++

Question

I'm trying to store my methodDecl nodes in a map within RecursiveASTVisitor
std::map<std::string, ObjCMethodDecl> ObjCMethodsMap;
Currently I'm storing it like this
virtual bool HandleTopLevelDecl (DeclGroupRef DG) {
for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
Decl *D = *i;
if (ObjCMethodDecl *methodDecl = dyn_cast<ObjCMethodDecl>(D)) {
std::string methodName = methodDecl->getNameAsString();
ObjCMethodsMap[methodName] = ObjCMethodDecl(*methodDecl);
}
}
}
And when I'm trying to use it, I do this
ObjCMethodDecl methodDecl = ObjCMethodsMap["textFieldShouldReturn:"];
Visitor->TraverseDecl(&methodDecl);
This may be more of a C++ question, but am I doing anything wrongly in my way of storing it in reference?
Below is the compilation error message I'm getting. I'm not sure what does it say now because it is referencing to something not within my code and doesn't tell me which line it came from. That's why I thought maybe I did something wrong in C++
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:1645:31: error: no matching constructor for initialization of 'clang::ObjCMethodDecl'
::new((void*)__p) _Up(_VSTD::forward<_Args>(__args)...);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:1572:18: note: in instantiation of function template specialization 'std::__1::allocator<std::__1::__tree_node<std::__1::__value_type<std::__1::basic_string<char>, clang::ObjCMethodDecl>, void *> >::construct<clang::ObjCMethodDecl>' requested here
{__a.construct(__p, _VSTD::forward<_Args>(__args)...);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:1453:14: note: in instantiation of function template specialization 'std::__1::allocator_traits<std::__1::allocator<std::__1::__tree_node<std::__1::__value_type<std::__1::basic_string<char>, clang::ObjCMethodDecl>, void *> > >::__construct<clang::ObjCMethodDecl>' requested here
{__construct(__has_construct<allocator_type, pointer, _Args...>(),
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/map:1366:20: note: in instantiation of function template specialization 'std::__1::allocator_traits<std::__1::allocator<std::__1::__tree_node<std::__1::__value_type<std::__1::basic_string<char>, clang::ObjCMethodDecl>, void *> > >::construct<clang::ObjCMethodDecl>' requested here
__node_traits::construct(__na, _VSTD::addressof(__h->__value_.__cc.second));
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/map:1380:29: note: in instantiation of member function 'std::__1::map<std::__1::basic_string<char>, clang::ObjCMethodDecl, std::__1::less<std::__1::basic_string<char> >, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char>, clang::ObjCMethodDecl> > >::__construct_node_with_key' requested here
__node_holder __h = __construct_node_with_key(__k);
^
/Users/jeremy/Desktop/clang-llvm/llvm/tools/clang/tools/extra/myASTChecker/MyASTChecker.cpp:272:55: note: in instantiation of member function 'std::__1::map<std::__1::basic_string<char>, clang::ObjCMethodDecl, std::__1::less<std::__1::basic_string<char> >, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char>, clang::ObjCMethodDecl> > >::operator[]' requested here
ObjCMethodDecl methodDecl = ObjCMethodsMap[selectorName];
^
/Users/jeremy/Desktop/clang-llvm/llvm/tools/clang/include/clang/AST/DeclObjC.h:113:7: note: candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 0 were provided
class ObjCMethodDecl : public NamedDecl, public DeclContext {
^
/Users/jeremy/Desktop/clang-llvm/llvm/tools/clang/include/clang/AST/DeclObjC.h:113:7: note: candidate constructor (the implicit move constructor) not viable: requires 1 argument, but 0 were provided
/Users/jeremy/Desktop/clang-llvm/llvm/tools/clang/include/clang/AST/DeclObjC.h:226:3: note: candidate constructor not viable: requires at least 6 arguments, but 0 were provided
ObjCMethodDecl(SourceLocation beginLoc, SourceLocation endLoc,