From d0d934e8333cffe093569b9f48a10b3500d1ff60 Mon Sep 17 00:00:00 2001
From: Robin Krahl <me@robin-krahl.de>
Date: Sun, 13 Jan 2019 12:04:03 +0100
Subject: Add misc::Option<T> class

Option<T> is a simple replacement for std::optional, which was
introduced in C++17.  It stores a value that can be present or absent.
---
 libnitrokey/misc.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/libnitrokey/misc.h b/libnitrokey/misc.h
index 88254dd..d10c8df 100644
--- a/libnitrokey/misc.h
+++ b/libnitrokey/misc.h
@@ -29,12 +29,37 @@
 #include "log.h"
 #include "LibraryException.h"
 #include <sstream>
+#include <stdexcept>
 #include <iomanip>
 
 
 namespace nitrokey {
 namespace misc {
 
+/**
+ * Simple replacement for std::optional (C++17).
+ */
+template<typename T>
+class Option {
+public:
+    Option() : m_hasValue(false), m_value() {}
+    Option(T value) : m_hasValue(true), m_value(value) {}
+
+    bool has_value() const {
+        return m_hasValue;
+    }
+    T value() const {
+        if (!m_hasValue) {
+            throw std::logic_error("Called Option::value without value");
+        }
+        return m_value;
+    }
+
+private:
+    bool m_hasValue;
+    T m_value;
+};
+
     template<typename T>
     std::string toHex(T value){
       using namespace std;
-- 
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