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== C++ Performance
(Adapted from CppCon2016 Practical Performance Practices)
https://florianjw.de/en/cpp_coding_standard.html
- Prefer std::array, then std::vector
- Construct and initialize in one step
- Use const always when possible
- To enable const with complex initialization, use lambdas
- Don't recalculate values that only need to be calculated once
- Don't disable move operations - moving is more efficient than copying
- Avoid shared_ptr copies unless really needed
- Prefer returning unique_ptr from factories
- Use '\n' instead of std::endl
- Use lambdas - they have no overhead compared to direct functions
- final can help the compiler optimize virtual function calls
- Code branches are expensive
=== Smaller code is faster code
=== Do one thing and do it well
Simple code is easy to understand, easy to maintain, and as such lead to less bugs.
=== Only use text formats
They can be edited both by humans and by programs. Use generic formats (ini, json, etc.) instead of custom ones.
=== Document your changes
Don't do this just for others, do it for your future self.
== Useful compiler options
- -fuse-ld=gold
- -Wold-style-cast
=== Setting in meson
Compiler arguments are free-form comma-separated list.
meson configure -Dcpp_args="-Wold-style-cast"
meson configure -Dcpp_link_args="-fuse-ld=gold"
== C++ Coding Standard
=== Naming Conventions
- Naming uses camelCase
- Private attributes are prefixed with 'm_'.
- Include guards should be named SMOLBOTE_<class name in caps>_H
=== Compiler
- Use the highest sane warning level.
=== Resource management
- Manage your resources with RAII (Resource Acquisition Is Initialization).
=== Functions
- Try to keep the complexity low and the body short.
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