# cppreference Lookup

Use cppreference to verify rules and to link in findings. Fetch pages with web
fetch when unsure.

## How to look things up

- Search any symbol, header, or keyword:
  `https://cppreference.com/index.php?title=Special%3ASearch&search=<TERM>` e.g.
  `...&search=cstdint`, `...&search=std%3A%3Aspan`, `...&search=memory_order`
  The results page links to C++ and C entries separately; pick the right column.
- Each page lists which standard (C++11/17/20/23) added a feature; check it
  against the project's `-std`.

## Entry points

- Language: https://en.cppreference.com/cpp/language
- Standard library headers: https://en.cppreference.com/cpp/header
- Fixed-width integers `<cstdint>`:
  https://en.cppreference.com/cpp/header/cstdint
- Undefined behavior: https://en.cppreference.com/cpp/language/ub
- Object lifetime: https://en.cppreference.com/cpp/language/lifetime
- Initialization: https://en.cppreference.com/cpp/language/initialization
- Evaluation order: https://en.cppreference.com/cpp/language/eval_order
- Exceptions: https://en.cppreference.com/cpp/language/exceptions
- Memory / smart pointers: https://en.cppreference.com/cpp/memory
- Containers (iterator invalidation tables):
  https://en.cppreference.com/cpp/container
- Concurrency: https://en.cppreference.com/cpp/thread
- Memory order: https://en.cppreference.com/cpp/atomic/memory_order
- Compiler support by standard: https://en.cppreference.com/cpp/compiler_support
- C reference (for C interop): https://en.cppreference.com/c

## Other references

- C++ Core Guidelines:
  https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines
- clang-tidy checks: https://clang.llvm.org/extra/clang-tidy/checks/list.html

If a deep link 404s, use the search URL above instead.