From 23581d4d63e6ed41c9e3a3886f24d526dd7a557d Mon Sep 17 00:00:00 2001
From: saurabh singh <saurabh8c@gmail.com>
Date: Tue, 30 May 2017 22:36:21 +0530
Subject: [PATCH] Adding derference operator to not_null (#513)

---
 include/gsl/gsl         |  1 +
 tests/notnull_tests.cpp | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/gsl/gsl b/include/gsl/gsl
index e6df917..65ce7eb 100644
--- a/include/gsl/gsl
+++ b/include/gsl/gsl
@@ -98,6 +98,7 @@ public:
 
     constexpr operator T() const { return get(); }
     constexpr T operator->() const { return get(); }
+    constexpr auto operator*() const { return *get(); } 
 
     // prevents compilation when someone attempts to assign a null pointer constant
     not_null(std::nullptr_t) = delete;
diff --git a/tests/notnull_tests.cpp b/tests/notnull_tests.cpp
index bb043bb..85ed5b5 100644
--- a/tests/notnull_tests.cpp
+++ b/tests/notnull_tests.cpp
@@ -250,6 +250,21 @@ SUITE(NotNullTests)
         CHECK((NotNull1(p1) >= NotNull2(p2)) == (p1 >= p2));
         CHECK((NotNull2(p2) >= NotNull1(p1)) == (p2 >= p1));
     }
+
+     TEST(TestNotNullDereferenceOperator)
+     {
+        auto sp1 = std::make_shared<int>(42);
+
+        using NotNullSp1 = not_null<decltype(sp1)>;
+
+        CHECK(*NotNullSp1(sp1) == *sp1);
+
+        int ints[1] = {42};
+        CustomPtr<int> p1(&ints[0]);
+
+        using NotNull1 = not_null<decltype(p1)>;
+        CHECK(*NotNull1(p1) == 42);
+    }
 }
 
 int main(int, const char* []) { return UnitTest::RunAllTests(); }