Support -fno-exceptions

include/boost/variant2/variant.hpp

@@ -29,6 +29,13 @@
 
 namespace boost
 {
+
+#ifdef BOOST_NO_EXCEPTIONS
+
+BOOST_NORETURN void throw_exception( std::exception const & e ); // user defined
+
+#endif
+
 namespace variant2
 {
 
@@ -53,7 +60,15 @@ namespace detail
 
 BOOST_NORETURN inline void throw_bad_variant_access()
 {
+#ifdef BOOST_NO_EXCEPTIONS
+
+    boost::throw_exception( bad_variant_access() );
+
+#else
+
     throw bad_variant_access();
+
+#endif
 }
 
 } // namespace detail

test/Jamfile

@@ -89,3 +89,17 @@ run variant_convert_construct_throw.cpp ;
 
 run variant_copy_assign_throw.cpp ;
 run variant_move_assign_throw.cpp ;
+
+local NX =
+    <exception-handling>off
+    <toolset>msvc:<cxxflags>/wd4530
+    <toolset>msvc:<cxxflags>/wd4577
+    ;
+
+run variant_get_by_index.cpp throw_exception.cpp : : : $(NX) : variant_get_by_index_nx ;
+compile variant_get_by_index_cx.cpp : $(NX) : variant_get_by_index_cx_nx ;
+
+run variant_get_by_type.cpp throw_exception.cpp : : : $(NX) : variant_get_by_type_nx ;
+compile variant_get_by_type_cx.cpp : $(NX) : variant_get_by_type_cx_nx ;
+
+run variant_subset.cpp throw_exception.cpp : : : $(NX) : variant_subset_nx ;

test/throw_exception.cpp

@@ -0,0 +1,19 @@
+
+// Copyright 2019 Peter Dimov.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <exception>
+#include <cstdio>
+
+namespace boost
+{
+
+void throw_exception( std::exception const & e )
+{
+    std::fprintf( stderr, "Exception: %s\n", e.what() );
+    std::terminate();
+}
+
+} // namespace boost