Fix the chicken-and-egg problem where you use type hashes generated from

types in the same library:

1) clscan parses your C++ file.
2) Your C++ file includes clcppcodegen.h.
3) OOPS! That file is generated by step 5 and doesn't exist yet.
4) clmerge parses the output from clscan.
5) clmerge generates clcppcodegen.h.

inc/clcpp/clcpp.h

@@ -984,5 +984,27 @@ namespace clcpp
     }
 }
 
+//
+// Compile-time typename hash
+//
+#ifdef __clcpp_parse__
+
+// This path is only compiled during a clscan pass and its intention is to ensure a unique value is returned from clcppTypeHash
+// without needing to include the generated header file. This solves the issue of requiring the generated header file to allow
+// clscan to compile successfully, before the dependent process clmerge generates the header file using the output of clscan.
+constexpr unsigned int clcppCompileTimeHash(const char* const str, const unsigned int value)
+{
+    return str[0] == 0 ? value : clcppCompileTimeHash(str + 1, (value ^ (unsigned int)str[0]) * 0x01000193);
+}
 template <typename Type>
-constexpr unsigned int clcppTypeHash();
+constexpr unsigned int clcppTypeHash()
+{
+    return clcppCompileTimeHash(__PRETTY_FUNCTION__, 0x01000193);
+}
+
+#else
+
+template <typename Type>
+constexpr unsigned int clcppTypeHash();
+
+#endif

src/clReflectTest/TestConstexprGetType.cpp

@@ -1,7 +1,11 @@
 
-#include "clcppcodegen.h"
+#include <clcpp/clcpp.h>
 #include <cstdio>
 
+#ifndef __clcpp_parse__
+    #include "clcppcodegen.h"
+#endif
+
 struct Base
 {
     const clcpp::Type* type = nullptr;