/meta-list

Intuitive & Powerful C++20 consteval metaprogramming library(via value).

Primary LanguageC++MIT LicenseMIT

meta-list

This library provides a bunch of consteval toolsets to do metaprogramming, and provides the pipeline syntactic sugar for function combination, its experience is better than traditional template metaprogramming.

All PRs are welcome.

value calculation

constexpr auto res = value_list<1,2,3,4,5,6,7,8,9,10>
                   | transform([](auto x) { return _v<x * x>; })
                   | filter([](auto x) { return _v<x < 30>; })
                   | fold_left(_v<0>, [](auto acc, auto n) { return _v<acc + n>; })
                   ;
static_assert(res == 55);

type calculation

constexpr auto result = type_list<int, char, long, char, short, float, double>
                      | filter([]<typename T>(TypeConst<T>) { return _v<sizeof(T) < 4>; })
                      | transform([]<typename T>(TypeConst<T>) { return _t<std::add_pointer_t<T>>; })
                      | unique()
                      | convert_to<std::variant>()
                      ;
static_assert(result == _t<std::variant<char*, short*>>);

Tested Compiler

  • gcc-11.2 Worked
  • msvc-19.30.30705 VS17.0 Worked
  • clang-14 Crashed

More motivated examples

examples

Inspiration