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#include <vector>
#include <iostream>
#include <memory>
 
class Renderer {};
class AudioPlayer {};
 
namespace Asset {
	class Asset {};
	class Sprite: public Asset {};
	class Font: public Asset {};
	class SoundEffect: public Asset {};
	class SoundTrack: public Asset {};
	//Asset (Un)loading
	class Loader {};
}
 
std::vector<std::shared_ptr<A>> items;
 
void test(A& a) {
	printf("A\n");	
}
 
void test(std::shared_ptr<B> b) {
	printf("B\n");
}
 
void test(C& c) {
	printf("C\n");
}
 
int main() {
	items.push_back(std::make_shared<B>());
	for(auto i: items) {
		test(i);
	}
}

prog.cpp:18:29: error: use of undeclared identifier 'A'
std::vector<std::shared_ptr<A>> items;
                            ^
prog.cpp:18:38: error: expected a type
std::vector<std::shared_ptr<A>> items;
                                     ^
prog.cpp:20:11: error: unknown type name 'A'
void test(A& a) {
          ^
prog.cpp:24:27: error: use of undeclared identifier 'B'
void test(std::shared_ptr<B> b) {
                          ^
prog.cpp:24:27: error: use of undeclared identifier 'B'
prog.cpp:28:11: error: unknown type name 'C'
void test(C& c) {
          ^
prog.cpp:33:2: error: use of undeclared identifier 'items'
        items.push_back(std::make_shared<B>());
        ^
prog.cpp:33:35: error: use of undeclared identifier 'B'
        items.push_back(std::make_shared<B>());
                                         ^
prog.cpp:34:14: error: use of undeclared identifier 'items'
        for(auto i: items) {
                    ^
9 errors generated.

Standard output is empty