initial commit

+io/private/ptycho_reader/precision.h

@@ -0,0 +1,59 @@
+#ifndef PRECISION_H
+#define PRECISION_H
+
+/*!
+ * \file
+ * Precision handling support
+ *
+ * \pre needs standard exceptions and string
+ */
+
+/*!
+ * \brief Precision related functions and types
+ */
+namespace precision {
+
+    /*!
+     * \brief Single or double precision
+     */
+    enum type : unsigned char {
+        Single,    //!< single precision
+        Double     //!< double precision
+    };
+
+    /*!
+     * \brief Precision from string
+     * \arg str precision string
+     * \return precision
+     */
+    inline type from_str(const std::string &str)
+    {
+        type prec = Single;
+        if (str == "double")
+            prec = Double;
+        else if (str != "single")
+            throw std::invalid_argument("undefined precision string, must be 'single' or 'double'");
+        return prec;
+    }
+
+    /*!
+     * \brief Precision to string
+     * \arg prec precision
+     * \return string
+     */
+    inline const char* to_str(type prec)
+    {
+        switch (prec) {
+            case Single:
+                return "single";
+            case Double:
+                return "double";
+            default:
+                throw std::invalid_argument("undefined precision value");
+        }
+        return "undef";
+    }
+
+} // namespace precision
+
+#endif