Added rendering of concept requirements in concept body

tests/t00056/t00056.cc

@@ -32,9 +32,16 @@ concept has_value_type = requires
 };
 
 template <typename T>
-concept convertible_to_string = requires(T s)
+concept convertible_to_string = max_four_bytes<T> && requires(T s)
 {
     std::string{s};
+    {
+        std::to_string(s)
+    }
+    noexcept;
+    {
+        std::to_string(s)
+        } -> std::same_as<std::string>;
 };
 
 // Compound requirement

tests/t00056/test_case.h

@@ -44,6 +44,24 @@ TEST_CASE("t00056", "[test-case][class]")
     REQUIRE_THAT(puml, IsConcept(_A("iterable_with_value_type<T>")));
     REQUIRE_THAT(puml, IsConcept(_A("iterable_or_small_value_type<T>")));
 
+    REQUIRE_THAT(puml,
+        IsConceptRequirement(
+            _A("greater_than_with_requires<T,P>"), "sizeof (l) > sizeof (r)"));
+
+    REQUIRE_THAT(
+        puml, IsConceptRequirement(_A("iterable<T>"), "container.begin()"));
+    REQUIRE_THAT(
+        puml, IsConceptRequirement(_A("iterable<T>"), "container.end()"));
+
+    REQUIRE_THAT(puml,
+        IsConceptRequirement(_A("convertible_to_string<T>"), "std::string{s}"));
+    REQUIRE_THAT(puml,
+        IsConceptRequirement(
+            _A("convertible_to_string<T>"), "{std::to_string(s)} noexcept"));
+    REQUIRE_THAT(puml,
+        IsConceptRequirement(_A("convertible_to_string<T>"),
+            "{std::to_string(s)} -> std::same_as<std::string>"));
+
     // Check if class templates exist
     REQUIRE_THAT(puml, IsClassTemplate("A", "max_four_bytes T"));
     REQUIRE_THAT(puml, IsClassTemplate("B", "T"));

tests/test_cases.h

@@ -445,6 +445,13 @@ ContainsMatcher IsConstraint(std::string const &from, std::string const &to,
             fmt::format("{} ..> {} : {}", from, to, label), caseSensitivity));
 }
 
+ContainsMatcher IsConceptRequirement(std::string const &cpt,
+    std::string const &requirement,
+    CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
+{
+    return ContainsMatcher(CasedString(requirement, caseSensitivity));
+}
+
 ContainsMatcher IsLayoutHint(std::string const &from, std::string const &hint,
     std::string const &to,
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)