_2o_trait_simple.cpp

Simple trait usage

#include <bit_factory/anyxx.hpp>
#include <catch2/catch_test_macros.hpp>
#include <string>
 
namespace simple {
 
TRAIT(trait1, (ANY_FN(std::string, fn1, (), const)))
 
std::string cat(std::vector<anyxx::any<anyxx::val, trait1>> const& items) {
  std::string result;
  for (auto const& item : items) {
    result += item.fn1();
  }
  return result;
}
 
struct model1 {
  std::string s;
  [[nodiscard]] std::string fn1() const { return "model1"; }
};
 
struct model2 {
  int x;
};
 
}  // namespace simple
 
ANY_MODEL_MAP((simple::model2), simple::trait1) {
  static std::string fn1(simple::model2 const& m) {
    return std::to_string(m.x);
  };
};
 
TEST_CASE("any via concept simple") {
  using namespace anyxx;
  using namespace simple;
 
  any<val, trait1> test1{model1{"model1"}};
  CHECK(test1.fn1() == "model1");
  any<val, trait1> test2{model2{42}};
  CHECK(test2.fn1() == "42");
 
  CHECK(cat({test1, test2}) == "model142");
}