Permit compilation with -fno-exceptions.

If one invokes throw_exception by accident, should fail to link.

Author: robertramey

CMakeLists.txt

@@ -18,6 +18,10 @@ target_compile_features(boost_safe_numerics INTERFACE cxx_std_14)
 # Compiler settings - special settings for known compilers
 #
 
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
 message(STATUS "compiler is ${CMAKE_CXX_COMPILER_ID}" )
 
 if( CMAKE_CXX_COMPILER_ID STREQUAL "GNU" )

include/boost/safe_numerics/exception_policies.hpp

@@ -8,7 +8,7 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/mp11.hpp>
-
+#include <boost/config.hpp> // BOOST_NO_EXCEPTIONS
 #include "exception.hpp"
 
 namespace boost {
@@ -55,16 +55,20 @@ struct ignore_exception {
     constexpr ignore_exception(const safe_numerics_error &, const char * ){}
 };
 
+// emit compile time error if this is invoked.
+struct trap_exception {};
+
 // If an exceptional condition is detected at runtime throw the exception.
 struct throw_exception {
+    #ifndef BOOST_NO_EXCEPTIONS
     throw_exception(const safe_numerics_error & e, const char * message){
         throw std::system_error(std::error_code(e), message);
     }
+    #else
+    trap_exception(const safe_numerics_error & e, const char * message);
+    #endif
 };
 
-// emit compile time error if this is invoked.
-struct trap_exception {};
-
 // given an error code - return the action code which it corresponds to.
 constexpr safe_numerics_actions
 make_safe_numerics_action(const safe_numerics_error & e){