Using forward declarations for build in datatypes.
- by bdhar
I understand that wherever possible we shall use forward declarations instead of includes to speed up the compilation.
I have a class Person like this.
#pragma once
#include <string>
class Person
{
public:
Person(std::string name, int age);
std::string GetName(void) const;
int GetAge(void) const;
private:
std::string _name;
int _age;
};
and a class Student like this
#pragma once
#include <string>
class Person;
class Student
{
public:
Student(std::string name, int age, int level = 0);
Student(const Person& person);
std::string GetName(void) const;
int GetAge(void) const;
int GetLevel(void) const;
private:
std::string _name;
int _age;
int _level;
};
In Student.h, I have a forward declaration class Person; to use Person in my conversion constructor. Fine. But I have done #include <string> to avoid compilation error while using std::string in the code. How to use forward declaration here to avoid the compilation error? Is it possible?
Thanks.
