feat: add into method to Option and Result + macro try_unwrap

test/test.cpp

@@ -19,6 +19,10 @@ static Stat g_stat = {0,0};
     throw Error(ro::sfmt("ASSERT ERROR %s:%d: " fmt, __FILE__, __LINE__, ##__VA_ARGS__)); \
 }
 
+class TestError: public Error {
+public:
+    TestError(const char *s) : Error(s){};
+};
 
 void test(const char* desc, const std::function<void()>& lambda)
 {
@@ -36,6 +40,13 @@ void test(const char* desc, const std::function<void()>& lambda)
     g_stat.total++;
 }
 
+Result<int, Error> test_macro(const Result<int, Error> & target)
+{
+    int a;
+    try_unwrap(a,target);
+    return a;
+}
+
 int main(int argc, char const *argv[])
 {
     test("Test Option", [](){
@@ -231,6 +242,20 @@ int main(int argc, char const *argv[])
         assert(x.zip(z).is_none(), "Unexpected value");
         
     });
+    
+    test("Option Into", [](){
+        Option<int> x = 2;
+        int y = 0;
+        bool v = x.into(y);
+        assert(v, "Return value shall be true");
+        assert(y == 2, "Unexpected value");
+
+        x = None(int);
+        v = x.into(y);
+        y = 0;
+        assert(v == false, "Return value shall not be true");
+        assert(y == 0, "Unexpected value");
+    });
 
     test("Test Result", []{
         Result<string, Error> ret = ERR("Error");
@@ -263,6 +288,7 @@ int main(int argc, char const *argv[])
         catch(Error e)
         {
             assert(true, "%s", e.what());
+            cout << e.what() << endl;
         }
     });
 
@@ -396,5 +422,27 @@ int main(int argc, char const *argv[])
     });
 
 
+    test("Result Into", [](){
+        Result<int, Error> x = 2;
+        int y = 0;
+        bool v = x.into(y);
+        assert(v, "Return value shall be true");
+        assert(y == 2, "Unexpected value");
+
+        x = ERR("Error");
+        v = x.into(y);
+        y = 0;
+        assert(v == false, "Return value shall not be true");
+        assert(y == 0, "Unexpected value");
+    });
+
+    test("try_unwrap", [](){
+        Result<int, Error> x = test_macro(Result<int, Error>(10));
+        assert(x == 10, "Unexpected value");
+
+        x = test_macro(Result<int, Error>(Error("Hello")));
+        assert(x.is_err(), "Unexpected value");
+    });
+
     cout << "REPORT: " << g_stat.passed << " tests passed / " << g_stat.total << " tests." << endl;
 }