1 files changed, 146 insertions, 0 deletions
diff --git a/src/boost/libs/safe_numerics/test/test_subtract.hpp b/src/boost/libs/safe_numerics/test/test_subtract.hpp
new file mode 100644
index 000000000..832d49e23
--- /dev/null
+++ b/src/boost/libs/safe_numerics/test/test_subtract.hpp
@@ -0,0 +1,146 @@
+#ifndef BOOST_TEST_SUBTRACT_HPP
+#define BOOST_TEST_SUBTRACT_HPP
+
+//  Copyright (c) 2015 Robert Ramey
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <iostream>
+
+#include <boost/safe_numerics/safe_integer.hpp>
+#include <boost/safe_numerics/range_value.hpp>
+
+template<class T1, class T2>
+bool test_subtract(
+    T1 v1,
+    T2 v2,
+    const char *av1,
+    const char *av2,
+    char expected_result
+){
+    std::cout << "testing"<< std::endl;
+    {
+        safe_t<T1> t1 = v1;
+        using result_type = decltype(t1 - v2);
+        std::cout << "safe<" << av1 << "> - " << av2 << " -> ";
+        static_assert(
+            boost::safe_numerics::is_safe<safe_t<T1> >::value,
+            "safe_t not safe!"
+        );
+        static_assert(
+            boost::safe_numerics::is_safe<result_type>::value,
+            "Expression failed to return safe type"
+        );
+
+        try{
+            // use auto to avoid checking assignment.
+            auto result = t1 - v2;
+            std::cout << make_result_display(result);
+            if(expected_result == 'x'){
+                std::cout
+                    << " ! = "<< av1 << " - " << av2
+                    << " failed to detect error in subtraction "
+                    << std::endl;
+                t1 - v2;
+                return false;
+            }
+            std::cout << std::endl;
+        }
+        catch(const std::exception &){
+            if(expected_result == '.'){
+                std::cout
+                    << " == "<< av1 << " - " << av2
+                    << " erroneously detected error in subtraction "
+                    << std::endl;
+                try{
+                    t1 - v2;
+                }
+                catch(const std::exception &){}
+                return false;
+            }
+        }
+    }
+    {
+        safe_t<T2> t2 = v2;
+        using result_type = decltype(v1 - t2);
+        std::cout << av1 << " - " << "safe<" << av2 << "> -> ";
+        static_assert(
+            boost::safe_numerics::is_safe<safe_t<T2> >::value,
+            "safe_t not safe!"
+        );
+        static_assert(
+            boost::safe_numerics::is_safe<result_type>::value,
+            "Expression failed to return safe type"
+        );
+
+        try{
+            // use auto to avoid checking assignment.
+            auto result = v1 - t2;
+            std::cout << make_result_display(result);
+            if(expected_result == 'x'){
+                std::cout
+                    << " ! = "<< av1 << " - " << av2
+                    << " failed to detect error in subtraction "
+                    << std::endl;
+                v1 - t2;
+                return false;
+            }
+            std::cout << std::endl;
+        }
+        catch(const std::exception &){
+            if(expected_result == '.'){
+                std::cout
+                    << " == "<< av1 << " - " << av2
+                    << " erroneously detected error in subtraction "
+                    << std::endl;
+                try{
+                    v1 - t2;
+                }
+                catch(const std::exception &){}
+                return false;
+            }
+        }
+    }
+    {
+        safe_t<T1> t1 = v1;
+        safe_t<T2> t2 = v2;
+        using result_type = decltype(t1 - t2);
+        std::cout << "safe<" << av1 << "> - " << "safe<" << av2 << "> -> ";
+        static_assert(
+            boost::safe_numerics::is_safe<result_type>::value,
+            "Expression failed to return safe type"
+        );
+        try{
+            // use auto to avoid checking assignment.
+            auto result = t1 - t2;
+            std::cout << make_result_display(result);
+            if(expected_result == 'x'){
+                std::cout
+                    << " ! = "<< av1 << " - " << av2
+                    << " failed to detect error in subtraction "
+                    << std::endl;
+                t1 - t2;
+                return false;
+            }
+            std::cout << std::endl;
+        }
+        catch(const std::exception &){
+            if(expected_result == '.'){
+                std::cout
+                    << " == "<< av1 << " - " << av2
+                    << "erroneously detected error in subtraction "
+                    << std::endl;
+                try{
+                    t1 - t2;
+                }
+                catch(const std::exception &){}
+                return false;
+            }
+        }
+    }
+    return true; // correct result
+}
+
+#endif // BOOST_TEST_SUBTRACT