--- title: Implementing vector | daily.dev description: A deep dive into implementing a custom std::vector<T> from scratch in C++. Covers the full class template including constructors (default, initializer list,... canonical: https://daily.dev/posts/implementing-vector-b9b7cs263 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Implementing vector | daily.dev og:description: A deep dive into implementing a custom std::vector<T> from scratch in C++. Covers the full class template including constructors (default, initializer list,... og:url: https://daily.dev/posts/implementing-vector-b9b7cs263 og:image: https://api.daily.dev/og/posts/B9b7cS263.png og:image:alt: Implementing vector og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Implementing vector **[C\+\+](https://daily.dev/sources/isocpp)** · 21 min read · 4 upvotes · 0 comments ## Summary A deep dive into implementing a custom std::vector 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. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [C\+\+26: std::inplace\_vector](https://daily.dev/posts/c-26-std-inplace-vector-9a9stjxez) · Sandor Dargo · 2 upvotes · 0 comments - [Part 1: std::inplace\_vector — The Fixed-Capacity Vector Finally Comes to C\+\+26](https://daily.dev/posts/part-1-std-inplace-vector-the-fixed-capacity-vector-finally-comes-to-c-26-obybukog4) · Towards Dev · 0 upvotes · 0 comments - [Follow up: resize \+ assign is often faster than reserve \+ emplace\_back for vector](https://daily.dev/posts/follow-up-resize-assign-is-often-faster-than-reserve-emplace-back-for-vector-nusmzcdfu) · Meeting C\+\+ · 1 upvotes · 0 comments - [Is resize \+ assign faster then reserve \+ emplace\_back for vector?](https://daily.dev/posts/is-resize-assign-faster-then-reserve-emplace-back-for-vector--af1k8eqai) · Meeting C\+\+ · 3 upvotes · 0 comments --- Tags: [#c++](https://daily.dev/tags/c++), [#data-structures](https://daily.dev/tags/data-structures) [View this post on daily.dev](https://daily.dev/posts/implementing-vector-b9b7cs263) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Implementing vector","url":"https://daily.dev/posts/implementing-vector-b9b7cs263","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/implementing-vector-b9b7cs263"},"datePublished":"2026-03-11T19:03:43.852Z","dateModified":"2026-03-11T19:04:18.383Z","description":"A deep dive into implementing a custom std::vector from scratch in C++. 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