From db0c4abe10a7e8ea9824e9c2df38ad5cbe5aba40 Mon Sep 17 00:00:00 2001
From: Sergii Bogomolov <sergii.bogomolov@imc.com>
Date: Thu, 7 Mar 2019 11:29:44 -0600
Subject: [PATCH] Throw option_required_exception if option value is not
 present

---
 include/cxxopts.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 94b81ef..69656e6 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -1044,6 +1044,12 @@ namespace cxxopts
       return m_count;
     }
 
+    bool
+    has_value() const
+    {
+      return m_value != nullptr;
+    }
+
     template <typename T>
     const T&
     as() const
@@ -1147,6 +1153,10 @@ namespace cxxopts
       }
 
       auto riter = m_results.find(iter->second);
+      if (!riter->second.has_value())
+      {
+        throw option_required_exception(option);
+      }
 
       return riter->second;
     }