I am currently trying to learn c++ and I am having an issue when trying to create a vector which iterates through several different objects whom all inherit from the same base class with smart pointers.
I parse a file and create the objects and insert them into the vector depending on the character parsed but I keep getting the error:
Error C2664 'std::unique_ptr<Test *,std::default_delete<_Ty>>::unique_ptr(const std::unique_ptr<_Ty,std::default_delete<_Ty>> &)': cannot convert argument 1 from 'std::unique_ptr<Test2,std::default_delete<_Ty>>' to 'std::nullptr_t'"
Code is as follows:
class Test {
public:
virtual ~Test(){}
virtual int update() {}
};
class Test2 : public Test {
private:
int a;
public:
Test2() {
}
Test2(int n) {
a = n;
}
int update() override {
return a;
}
};
class Test3 : public Test {
private:
int a;
public:
Test3() {
}
Test3(int n) {
a = n;
}
int update() override {
return a;
}
};
class Test4 : public Test {
private:
int a;
public:
Test4() {
}
Test4(int n) {
a = n;
}
int update() override {
return a;
}
};
class manager {
private:
std::vector<std::unique_ptr<Test*>> vList;
std::ifstream lvlFile;
public:
std::string tmp;
manager() {
}
~manager() {
}
void init(const char *path) {
lvlFile.open(path, 0);
while (lvlFile.eof() != true) {
std::getline(lvlFile, tmp);
for (char& a : tmp) {
switch (a) {
case 'w':
vList.emplace_back(std::make_unique<Test2>(2));
break;
case 'g':
vList.emplace_back(std::make_unique<Test3>(3));
break;
}
}
}
}
void print() {
for (auto& i : vList) {
std::cout << (*i)->update() << std::endl;
}
}
};
manager *m;
int main() {
m = new manager();
m->init("lvl.txt");
_getch();
}
Maybe I have misunderstood something crucial here but I have been looking around and found no real answers so any pointers to this would be most welcome!
