From 15184c5751601acbf0e378fe4814dc8cda644d47 Mon Sep 17 00:00:00 2001
From: Ian Bell <ian.h.bell@gmail.com>
Date: Thu, 21 Jan 2016 22:26:03 -0700
Subject: [PATCH] Add ability to retrieve REFPROP version; closes #937

---
 src/Backends/REFPROP/REFPROPMixtureBackend.cpp | 14 ++++++++++++++
 src/Backends/REFPROP/REFPROPMixtureBackend.h   |  4 +++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/Backends/REFPROP/REFPROPMixtureBackend.cpp b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
index bc1c95a2..7673b040 100644
--- a/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
+++ b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
@@ -193,6 +193,20 @@ bool REFPROPMixtureBackend::REFPROP_supported () {
     }
     return false;
 }
+std::string REFPROPMixtureBackend::version(){
+	long N = -1;
+	long ierr = 0;
+	char fluids[10000] = "", hmx[] = "HMX.BNC", default_reference_state[] = "DEF", herr[255] = "";
+	bool REFPROP_ok = REFPROPMixtureBackend::REFPROP_supported();
+    SETUPdll(&N, fluids, hmx, default_reference_state,
+                &ierr, herr,
+                10000, // Length of component_string (see PASS_FTN.for from REFPROP)
+                refpropcharlength, // Length of path_HMX_BNC
+                lengthofreference, // Length of reference
+                errormessagelength // Length of error message
+                );
+	return strstrip(std::string(herr, herr+254));
+}
 
 void REFPROPMixtureBackend::set_REFPROP_fluids(const std::vector<std::string> &fluid_names)
 {
diff --git a/src/Backends/REFPROP/REFPROPMixtureBackend.h b/src/Backends/REFPROP/REFPROPMixtureBackend.h
index f773e4b5..d5738c9c 100644
--- a/src/Backends/REFPROP/REFPROPMixtureBackend.h
+++ b/src/Backends/REFPROP/REFPROPMixtureBackend.h
@@ -47,6 +47,8 @@ public:
     
     std::string backend_name(void){return "REFPROPMixtureBackend";}
     virtual ~REFPROPMixtureBackend();
+
+	static std::string version();
 	
 	std::vector<std::string> calc_fluid_names(){return fluid_names;};
     PhaseEnvelopeData PhaseEnvelope;
@@ -94,7 +96,7 @@ public:
     void check_loaded_fluid(void);
 
     /// Returns true if REFPROP is supported on this platform
-    bool REFPROP_supported(void);
+    static bool REFPROP_supported(void);
     
     std::string fluid_param_string(const std::string &ParamName);