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Master Software Design Patterns and Architecture in C++

Solution: PImpl Idiom

Explore how the PImpl idiom helps separate a class interface from its implementation in C++. Understand how using an opaque pointer and a private implementation class allows for better encapsulation and easier code changes without recompiling dependent code.

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Solution

C++
#include <iostream>
#include <string>
#include "public.h"
class PublicClass::PImplClass {
 public:
    void DoPrivateStuff() {
        std::cout << className << "::privateMethod\n";
    }
 private:
    std::string className = "PublicClass";
};
PublicClass::PublicClass(): pImpl(new PImplClass) {}
PublicClass::~PublicClass() = default;
void PublicClass::publicMethod() {
    std::cout << "PublicClass::publicMethod\n";
    pImpl->DoPrivateStuff();
}

Code explanation

  • public.h file:

    • Lines 5–7: We already declared three public methods in the PublicClass: Constructor, Destructor, and a publicMethod. In this public method, we will access the
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