Method DoTests

libraries/lib-utility/tests/VariantTest.cpp:133–173

};

void DoTests()
{
   // Callable::OverloadSet can capture many kinds of things.  Test each.
   // This also tests compilation of the variadic constructor of OverloadSet
   // which can take a mix of l- and rvalues.
   CopyOnly copyOnly;
   const auto visitor = Callable::OverloadSet(
      &X::member,
      &Y::template memberfunction<Const>,
      &Z::constmemberfunction,
      nakedFunction,
      moveOnly(),
      copyOnly
   );

   X x;
   Y y;
   Z z;
   float f{};
   double d{};
   long double ld{};

   // Pointer to data member, captured as INVOKE-able, can only return lvalue
   // references, so it is excluded from other test cases
   if constexpr (ref == lvalue)
      testCase(visitor, 0, x);

   testCase(visitor, 1, y);
   testCase(visitor, 2, z);
   testCase(visitor, 3, f);
   testCase(visitor, 4, d);
   testCase(visitor, 5, ld);

   // An invocable can distinguish its own value category and constness
   REQUIRE(6 == std::move(visitor)(ld));
   using ConstVisitorType = decltype(visitor);
   using VisitorType = std::remove_const_t<ConstVisitorType>;
   auto &mutVisitor = const_cast<VisitorType&>(visitor);
   REQUIRE(7 == mutVisitor(ld));
   REQUIRE(8 == std::move(mutVisitor)(ld));
}

}; // stateless struct Tester