The PImpl idiom and the C++26 std:indirect type
This article explains the PImpl (Pointer to implementation) idiom in C++, a technique used to decouple class interfaces from their implementation details. It also discusses how upcoming C++26 features aim to simplify this pattern.
Why it matters
Understanding memory management and compilation optimization is critical for C++ developers working on large-scale software systems.
PImpl (which stands for Pointer to implementation) is a programming tehnicque to remove implementation details from a class by placing them in a separate class that is accessed through an opaque pointer. Its purpose is to separate interfaces and implementations and minimize compile-time dependencies. In this article, we’ll at how the PImpl idiom is typically implemented in C++ and how C++26 simplifies its implementation.
We can implement the Pimpl idiom using raw pointers and abiding to the Rule of Five. This is a guideline that says that when a class defines a special member function (for resource management) it should define all five of them (destructor, copy constructor, copy assignment operator, move constructor, move assignment operator).
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