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The code compiles OK with both gcc and clang as C++17 or as C++20 with a change for unique. See https://wandbox.org/permlink/tfhEOLLXuzGTdh7J

The issue is only with VS. Hence I've moved this to...

I'd change it to C++17 - and re-compile everything.

This C++17 example code demonstrates the problem:



#include <list>

using LT = std::list<int>;
using func_t = void(LT::*)();

In VS2019, for the project/properties/general/C++ Language standard

What's the value? Preview means using C++20 which has return values for these functions. C++17 and previous had return void for...

That's probably the issue. All the lines which now don't compile are those that reference functions that no longer return void, but have a return value - as of C++20! eg for C++20, unique() returns a...

What version of lua are you using? The latest version is 5.4.2

There's also info on the internet as to how to use lua with C++ and classes as lua seems to be written in C. I've never used it.

My response in my post #2 is based upon what I remember reading some time ago (MSDN blog post?) about some changes to the way Microsoft implement some class member functions which would have some...

I think that this is due to changes in the stl implementation that means that some stl class members are no longer 'true functions' ie functions to which an address can be taken. There's nothing in...

operator() needs to be declared const



bool operator()(const int* p1, const int* p2) const

John, please don't ask different questions in the same post. It's better to start a new post for each new question.

The assert is correct even if reserve is used. All reserve() does is to allocate memory (which MSVC does). It doesn't add any elements. If you just reserve and don't add any elements, then .size()...

NO. Don't do it. Don't use a std::string (or any non POD type) in a union. If you want these three types, use a std::variant with C++17.

I know you said you use C++11, but that is now over 9 years...

In which case you can't use templates.

If the compiler doesn't know the type at compile time, you're very limited as to what you can do. C++ is a strictly typed language.

If you update to a...

auto itr = std::find_if......


The scope of this itr only exists until the block closing }. It does not extend to the while clause. The itr used in the while clause is the same as that defined...

Where was the constellation of the planets and what was the phase of the moon when this event took place? :d

I'm assuming because of the previous posts, that the function that isn't exported has...

Use LoadLibrary()/GetProcAddress() to specify which one to use.

For differences between the various versions of VS2019, see https://www.tektutorialshub.com/visual-studio/difference-between-visual-studio-2019-community-vs-professional-vs-enterprise/

Have you tried creating a completly new solution with just the existing source files? IMO there's a solution file used in debugging that contains a wrong file reference. Try doing a file search for...

Just for interest/info - we stopped creating .dll's several years ago. We also stopped splitting classes into header/implementation files. Everything is now in .hpp files that are included as needed...

PS Has this fixed the previous error with the debug build with the missing subfolder? [ https://forums.codeguru.com/showthread.php?565257-Strange-crash-with-Debug-build ]

Under SDK's, libraries and frameworks - I have:

C++ ATL for latest v142 build tools (x86 & x64)
Windows 10 SDK (10.0.19041.0)

Yeah - Several C++ questions asked in this forum should be asked in the C++ (Non-visual C++ Issues) forum.

If both were built with VS2019, then I don't know. Other than there seems to be something wrong with your VS install. I'd be tempted to completely remove it and re-install from scratch. Have you got...

Yes - for OLE automation. There's quite a few different types - BSTR possibly being the most well known. They are not part of C++ though. These were developed by MS to help with interoperability with...

yes - probably because of different versions of std::stringstream exe/dll. You can't mix versions! This is the sort of thing that was called 'dll hell'! In the above, std::stringstream default...

All sins forgiven :)