Finding out how to implement features from the standard library can be a useful learning exercise. Quasar Chunawala explores implementing your own version of std::vector.

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A deep dive into implementing a custom std::vector<T> from scratch in C++. Covers the full class template including constructors (default, initializer list, copy, move), copy/move assignment operators, destructor, and the rule-of-five. Explains memory management using aligned operator new, custom deleters with unique_ptr, and uninitialized memory algorithms (std::uninitialized_copy, std::uninitialized_move). Walks through implementing reserve(), resize(), push_back() with fast/slow paths, emplace_back(), pop_back(), and a range insert() with careful handling of edge cases like self-referential insertion and iterator invalidation. Unit tests using Google Test are provided throughout, and the complete source is available on Compiler Explorer.

Implementing vector

How to think about adding elements to our container?