History
Understand the evolution of C++ templates by exploring classical concepts and the modern C++20 concepts inspired by Haskell’s type classes. Learn how concepts improve template constraints, enable better error messages, and empower type-safe generic programming without extra runtime costs.
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The Inspiration from Haskell
Type classes are interfaces for similar types. If a type is a member of a type class, it has to have specific properties. Type classes play a similar role in generic programming as interfaces play in object-oriented programming. Here you can see a part of Haskell’s type classes hierarchy.
Haskell’s type classes build a hierarchy. The type class Ord is a subclass of the type class Eq. Therefore, instances of the type class Ord have to be members of the type class Eq and in addition support the comparison ...