Daily C++ Tips and Puzzles
Seven C++ tips and seven puzzle answers. Each tip is a short, runnable example. Each puzzle is a short program with a bug; the answer, the observed output, the fix, and the lesson are on the puzzle's page. The loop: the email carries the tip and the puzzle; the puzzle's answer lives here.
Tips
- Daily C++ Tip 1: Return errors as values with std::expected
- Daily C++ Tip 2: Constrain a function with a concept, in the parameter list
- Daily C++ Tip 3: One function instead of const/non-const overload pairs (deducing this)
- Daily C++ Tip 4: A lazy pipeline with std::generator
- Daily C++ Tip 5: enumerate instead of a manual counter (C++23 ranges)
- Daily C++ Tip 6: A thread that stops itself cleanly (std::jthread)
- Daily C++ Tip 7: A sorted map backed by vectors (std::flat_map, C++23)
Puzzles
- Daily C++ Puzzle 1: The loop variable every lambda shares
- Daily C++ Puzzle 2: A declaration disguised as a variable
- Daily C++ Puzzle 3: The derived object that arrived as a base
- Daily C++ Puzzle 4: The future nobody kept
- Daily C++ Puzzle 5: auto that did not copy
- Daily C++ Puzzle 6: The overload that hid the other one
- Daily C++ Puzzle 7: The binding that copied
These fourteen pages are the seed archive. The email list is not open yet: the email sends once a provider is chosen and subscribers exist.
Facts verified 2026-11-04. The code on this page was compiled and run on the box with GCC 16.2.0 at -std=c++23 -Wall -Wextra; the outputs quoted are the observed outputs. MSVC was not tested.
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