Add ability to generate code from code_generator

include/cppast/code_generator.hpp

@@ -358,6 +358,12 @@ namespace cppast
             return main_entity_.value();
         }
 
+        /// \effects Generates the code for the specified entity.
+        /// It can be used to generate additional entities while generating another one.
+        /// \returns Whether or not any code was generated.
+        /// \notes This does not affect the main entity, but otherwise behaves just like [cppast::generate_code()]().
+        bool generate_code(const cpp_entity& entity);
+
     private:
         /// \returns The formatting options that should be used.
         /// The base class version has no flags set.

src/code_generator.cpp

@@ -1103,6 +1103,11 @@ namespace
     }
 }
 
+bool code_generator::generate_code(const cpp_entity& entity)
+{
+    return generate_code_impl(*this, entity, cpp_public);
+}
+
 bool cppast::generate_code(code_generator& generator, const cpp_entity& e)
 {
     generator.main_entity_ = type_safe::ref(e);