This repository provides concepts and constraints for C++'s standard named requirements.
Implemented concepts attempt to be fully standard compliant, and are documented within the code.
If your project uses a lot of templates, these can be incredibly useful to provide easy constraints for your template parameters, and improve error messages if a user gives a template an incompatible type.
It is meant as a companion to the standard concepts header.
All of the concepts are contained in the nr_concepts namespace, and follow the exact same naming conventions as specified in the official C++ standard.
Example:
using namespace nr_concepts;
//T must meet the swappable named requirement
//https://en.cppreference.com/w/cpp/named_req/Swappable
template<Swappable T>
void swapSomething(T& a, T&, b)
{
std::swap(a, b);
}- DefaultConstructible
- MoveConstructible
- CopyConstructible
- MoveAssignible
- CopyAssignible
- Destructible
- TriviallyCopyable
- TrivialType
- StandardLayourType
- PODType
- EqualityComparable
- LessThanCompareable
- Swappable
- NullablePointer
Thank you for wanting to contribute!
If you want to add a concept to the library, feel free to submit a PR with the change. The concept should be defined in the concepts.h file, and follow this general format:
//Description (preferably from cppreference)
template<typename T>
concept NamedRequirement = someConcept;Please check the other concepts before submitting a PR to get the best idea of how to properly submit a formatted concept.
You should also add it to the README.md file as a bullet point, similar to other concepts.