Changing comments to multi-line

expect.hpp

@@ -62,19 +62,23 @@ namespace contract {
     expr pop_exception( __VA_ARGS__ ), \
     get_default_message( "precondition failed: ", expr ) )
 
-//#define ensures( cond, ... ) \
+/*
+#define ensures( cond, ... ) \
   contract::_contract_impl< exception_type( std::runtime_error, ##__VA_ARGS__ )>( \
     cond , ##__VA_ARGS__ , \
     get_default_message( "postcondition failed: ", cond ) )
-
-// RVO works if expr is an rvalue, but not if it is an
-// lvalue. e.g:
-// return ensures( expression, condition );
-//   will rvo the object (if expression is rvo-able)
-// but
-// return ensures( var, condition );
-//   will not, instead copies
-// By making _ an argument, both options will move
+ */
+
+/**
+ * RVO works if expr is an rvalue, but not if it is an
+ * lvalue. e.g:
+ * return ensures( expression, condition );
+ *   will rvo the object (if expression is rvo-able)
+ * but
+ * return ensures( var, condition );
+ *   will not, instead copies
+ * By making _ an argument, both options will move
+ */
 #define ensures( expr, cond, ... ) \
   [ & ]( ) { \
     decltype((expr)) _ = expr; \