Block: add std::complex as a special case in reflFirstTypeName

This makes reflFirstTypeName<std::complex<float>>() return
"std::complex<float>"s instead of "std::complex<T>"s, and likewise
for std::complex<double>.

Signed-off-by: Daniel Estévez <daniel@destevez.net>

core/include/gnuradio-4.0/Block.hpp

@@ -1974,6 +1974,8 @@ std::string reflFirstTypeName() {
         return fmt::format("gr::DataSet<{}>", reflFirstTypeName<typename Type::value_type>());
     } else if constexpr (UncertainValueLike<Type>) {
         return fmt::format("gr::UncertainValue<{}>", reflFirstTypeName<typename Type::value_type>());
+    } else if constexpr (pmtv::Complex<Type>) {
+        return fmt::format("std::complex<{}>", reflFirstTypeName<typename Type::value_type>());
     } else if constexpr (refl::is_reflectable<Type>()) {
         return refl::reflect<Type>().name.str();
 

core/test/qa_Block.cpp

@@ -897,4 +897,18 @@ const boost::ut::suite<"Requested Work Tests"> _requestedWorkTests = [] {
         expect(eq(resultSink.performed_work, 100UZ));
     };
 };
+
+const boost::ut::suite<"reflFirstTypeName Tests"> _reflFirstTypeNameTests = [] {
+    using namespace boost::ut;
+    using namespace gr::detail;
+    using namespace std::literals::string_literals;
+
+    "std::complex"_test = []() {
+        expect(eq(reflFirstTypeName<std::complex<double>>(),
+                  "std::complex<double>"s));
+        expect(eq(reflFirstTypeName<std::complex<float>>(),
+                  "std::complex<float>"s));
+    };
+};
+
 int main() { /* not needed for UT */ }