Source-level singleton plugins for C++

common.h

struct registry {
    static std::map<const char*,Plugin*> plugins;
    registry(const char* name, Plugin* plugin) {
        plugins[name]=plugin;
    }
};

#define REGISTER(name) \
    registry name ## _register(#name, new name());
    

main.cpp

#include "common.h"

std::map<const char*,Plugin*> registry::plugins;

int main(int argc, char *argv[])
{
    ...
    for(auto &i : registry::plugins) {
        ...
    }
    ...
}

plugin.cpp

#include "common.h"

class SomePlugin : public Plugin {
...
};

REGISTER(SomePlugin)