canceled error and condition

include/boost/capy/error.hpp

@@ -21,10 +21,14 @@ namespace capy {
 
     Return `error::eof` when originating an eof error.
     Check `ec == cond::eof` for portable comparison.
+
+    Return `error::canceled` when originating a cancellation error.
+    Check `ec == cond::canceled` for portable comparison.
 */
 enum class error
 {
     eof = 1,
+    canceled,
     test_failure
 };
 

src/cond.cpp

@@ -59,6 +59,9 @@ equivalent(
         return ec == capy::error::eof;
 
     case cond::canceled:
+        // Check capy::error::canceled
+        if(ec == capy::error::canceled)
+            return true;
         // Check boost::system::errc
         if(ec == boost::system::errc::operation_canceled)
             return true;

src/error.cpp

@@ -38,6 +38,7 @@ message(
     switch(static_cast<error>(code))
     {
     case error::eof: return "eof";
+    case error::canceled: return "operation canceled";
     case error::test_failure: return "test failure";
     default:
         return "unknown";