added result class

test/CMakeLists.txt

@@ -41,7 +41,8 @@ add_executable(tests
   models/book.hpp
   FieldTest.cpp
   models/recipe.hpp
-  ValueTest.cpp)
+  ValueTest.cpp
+  ResultTest.cpp)
 
 target_link_libraries(tests PRIVATE
   Catch2::Catch2WithMain

test/ResultTest.cpp

@@ -0,0 +1,47 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "matador/utils/result.hpp"
+
+namespace matador::test {
+
+enum class math_error : int32_t {
+  DIVISION_BY_ZERO = 1
+};
+
+utils::result<float, math_error>divide(int x, int y) {
+  if (y == 0) {
+    return utils::error(math_error::DIVISION_BY_ZERO);
+  }
+
+  return utils::ok(float(x) / y);
+}
+
+utils::result<float, math_error>multiply(int x, int y) {
+  return utils::ok(float(x) * y);
+}
+
+}
+
+using namespace matador;
+
+TEST_CASE("Result tests", "[result]") {
+  auto res = test::divide(4, 2);
+  REQUIRE(res);
+  REQUIRE(res.is_ok());
+  REQUIRE(!res.is_error());
+
+  REQUIRE((res.value() == 2.0));
+
+  REQUIRE_THROWS(res.err());
+
+  res = test::divide(4, 0);
+  REQUIRE(!res);
+  REQUIRE(!res.is_ok());
+  REQUIRE(res.is_error());
+
+  REQUIRE((res.err() == test::math_error::DIVISION_BY_ZERO));
+
+
+//  res = test::divide(4, 2)
+//    .and_then<>()
+}