Put curly brackets around nested inspected values and provide formatter for StringLiteral

Signed-off-by: Christian Parpart <christian@parpart.family>

Author: christianparpart

include/reflection-cpp/reflection.hpp

@@ -446,7 +446,9 @@ std::string Inspect(Object const& object)
             }
             else
             {
+                str += '{';
                 str += Inspect(arg);
+                str += '}';
             }
         };
         if (!str.empty())
@@ -472,3 +474,12 @@ std::string Inspect(std::vector<Object> const& objects)
     return str;
 }
 } // namespace Reflection
+
+template <std::size_t N>
+struct std::formatter<Reflection::StringLiteral<N>>: std::formatter<std::string_view>
+{
+    auto format(Reflection::StringLiteral<N> const& value, auto& ctx) const
+    {
+        return formatter<std::string_view>::format(value.sv(), ctx);
+    }
+};

test-reflection-cpp.cpp

@@ -66,5 +66,5 @@ TEST_CASE("nested", "[reflection]")
 {
     auto ts = TestStruct { 1, 2.0f, 3.0, "hello", { "John Doe", "john@doe.com", 42 } };
     auto const result = Reflection::Inspect(ts);
-    CHECK(result == R"(a=1 b=2 c=3 d="hello" e=name="John Doe" email="john@doe.com" age=42)");
+    CHECK(result == R"(a=1 b=2 c=3 d="hello" e={name="John Doe" email="john@doe.com" age=42})");
 }