C++ Generator
Commercial use OK
380+ models
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Model:
+ GPT-5, Claude, Gemini
Describe a class or feature and get modern C++23 - RAII + smart pointers, ranges, std::expected typed errors, std::format. CMakeLists.txt snippet emitted alongside. Self-hosted Qwen 3 Coder is free under the daily pool; premium Claude Sonnet / GPT-5 are worth it for complex template puzzles.
Explanation
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Generate C++ code with free AI. Systems programming and algorithms.
How to Use C++ Generator
1
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Our AI processes your request in seconds using the best open-source models.
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Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen-coder", "messages": [{"role": "user", "content": "Write a Python function that reverses a string."}]}'C++ Generator — FAQ
Modern C++23 (with C++17 / 20 fallbacks via the target picker) - RAII + smart pointers (no raw new/delete), constexpr where feasible, ranges + views, std::expected for typed errors, std::format for output. 8 style presets (Modern application / Header-only library / Embedded / CUDA / OpenGL graphics / Multi-threaded with std::jthread / Boost / Catch2 tests). CMakeLists.txt snippet emitted alongside.
Yes - a typical class with header + impl + tests costs ~2,000 tokens on Qwen 3 Coder, inside the 2,500 anonymous / 10,000 signed-up daily pool. C++ is verbose so deeper outputs cost more - premium Claude Sonnet / GPT-5 are worth it for complex template puzzles.
Copilot ($10 / $19 business / $39 enterprise per month) finishes lines as you type. Cursor ($20/mo) is a full IDE fork with better whole-file context. Tabnine ($12/mo Dev) is privacy-first. Our tool is web-based one-shot - describe a class, get header + impl + tests. C++ is one of the harder languages for any LLM - premium models earn their keep here more than in Python.
C++23 by default (the most modern stable). Downgrade via the target picker - C++20 (concepts, modules, ranges), C++17 (structured bindings, optional, variant, parallel STL), C++14 (auto return-type deduction, generic lambdas), C++11 (move semantics, smart pointers - bare minimum for production). Older standards exist but the model fights you on them.
Yes - that is rule 1 in the system prompt. Resources own themselves through unique_ptr / shared_ptr / file handles wrapped in custom RAII guards. Raw new and delete only appear when implementing custom containers, and even then with a clearly named cleanup. No leaks, no double-deletes.
Pick the CUDA preset. Output is .cu files with __global__ kernel functions, proper grid/block sizing, shared memory where it helps, async streams when overlap matters, error checking via cudaGetLastError. Includes the CMake hookup for enable_language(CUDA).
Pick the Multi-threaded with std::jthread preset. Output uses C++20 std::jthread (auto-joining), std::stop_token for cooperative cancellation, std::latch / std::barrier for sync points, std::atomic_ref for atomic operations on existing data. Coroutines (co_await, co_return) where target >= C++20 and they fit.
Pick the Header-only library preset. Everything is templated or inline, ODR-safe, no .cpp file required. Header guards or pragma once, namespace-scoped, no global state. Easy to drop into another project as a single .hpp.
Pick the Embedded preset. Output avoids exceptions and RTTI (typical embedded compiler flags), prefers std::span over containers, std::array over std::vector, no heap allocation in steady-state code, everything constexpr where possible. CMake snippet uses -fno-exceptions -fno-rtti.
That is the bar - clang-tidy clean, ASan / UBSan clean. The free Qwen tier occasionally produces a bugprone-narrowing-conversion or cppcoreguidelines-pro-bounds-pointer-arithmetic warning; premium models catch more preemptively. Always run sanitizers before deploying.
Yes - pick the Catch2 tests preset, or toggle Include tests on any style. Output uses Catch2 v3 with TEST_CASE / SECTION / REQUIRE_THAT + matchers. For doctest output, mention doctest in your description. CMake hookup includes the test target.
Yes - POST to /v1/chat/ with the same system prompt. Useful for IDE plugins (CLion, VS Code with C++ ext), build-pipeline scaffolding, or auto-generating boilerplate around proto/IDL definitions. Bearer auth, rate-limited. Docs at /api/.
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