C++ How to prevent Winapi::FreeLibrary removing a variable? - c++

Question

I have a dll with lib.h:
#pragma once
#ifdef EXPORTS
#define API __declspec(dllexport)
#else
#define API __declspec(dllimport)
#endif
extern "C" API void test1(std::vector<ValueType*>* functions);
and lib.cpp:
#include "pch.h"
#include <iostream>
#include <vector>
#include "ValueType.h"
#include "NumberValue.h"
#include "TestLib.h"
void test1(std::vector<ValueType*>* functions) {
functions->push_back(new NumberValue(123321));
And main file, that uses this dll is:
#include <iostream>
#include <vector>
#include <Windows.h>
#include "ValueType.h"
using namespace std;
typedef void (__cdecl* importedInitFunction)(std::vector<ValueType*>*);
importedInitFunction test1F;
std::vector<ValueType*> values;
int main() {
while (1) {
HMODULE lib = LoadLibrary("DllTest1.dll");
test1F = (importedInitFunction)GetProcAddress(lib, "test1");
test1F(&values);
FreeLibrary(lib);
std::cout << values.at(0)->asString();
system("pause");
}
return 0;
}
When I'm trying to compile my code, I catch an error because values.at(0) is removed.
How to prevent deleting my variable when calling FreeLibrary(lib) ? or
How to implement alternative way ?
Another classes that used:
ValueType.h:
#pragma once
#include <string>
class ValueType {
public:
virtual double asDouble() { return 999; }
virtual std::string asString() { return ""; }
};
NumberValue.h:
#pragma once
#include <string>
#include "ValueType.h"
class NumberValue : public ValueType {
public:
double m_value;
NumberValue(double value) : m_value(value) {}
virtual double asDouble() {
return m_value;
}
virtual std::string asString() {
return std::to_string(m_value);
}
};