Make a fake version of nullptr to work with old compilers
diff --git a/include/grpc++/config.h b/include/grpc++/config.h
index 35bf507..e10f00f 100644
--- a/include/grpc++/config.h
+++ b/include/grpc++/config.h
@@ -65,6 +65,26 @@
::google::protobuf::io::ZeroCopyInputStream
#endif
+#ifdef __GNUC__
+#if (__GNUC__ * 100 + __GNUC_MINOR__ < 406)
+#define GRPC_NO_NULLPTR
+#endif
+#endif
+
+#ifdef GRPC_NO_NULLPTR
+#include <memory>
+const class {
+public:
+ template <class T> operator T*() const {return static_cast<T *>(0);}
+ template <class T> operator std::unique_ptr<T>() const {
+ return std::unique_ptr<T>(static_cast<T *>(0));
+ }
+ operator bool() const {return false;}
+private:
+ void operator&() const = delete;
+} nullptr = {};
+#endif
+
namespace grpc {
typedef GRPC_CUSTOM_STRING string;