Does IntelliJ actually support C++?

Probably talking about CLion, their C/C++ offering.

Yes, CLion, my mistake, sorry.

Hmm, that's a bit disappointing…might I suggest trying out a LibClang-based IDE, if CLion isn't using it already? It can do wonders even to "stupid" applications. For example, my Sublime Text (by itself, with only basic knowledge of C++ keywords and such) with clangd tells me that std::make_shared comes from this code in <memory>:

  template<class _Tp, class ..._Args>
  inline _LIBCPP_INLINE_VISIBILITY
  typename enable_if
  <
      !is_array<_Tp>::value,
      shared_ptr<_Tp>
  >::type
  make_shared(_Args&& ...__args)
  {
      return shared_ptr<_Tp>::make_shared(_VSTD::forward<_Args>(__args)...);
  }

Oh no, what i mean is that it can't help me find the constructor of the thing i'm creating. Resolving a make_shared call to the implementation of make_shared is completely useless; the only thing you ever want to do is find the constructor it's forwarding to.