Fix crash when running with --list-listeners and no registered listen…

…ers.
catchorg · Jun 2, 2022 · 9bf2eae · 9bf2eae
1 parent 0f44d83
commit 9bf2eae
Showing 1 changed file with 24 additions and 21 deletions.
diff --git a/src/catch2/reporters/catch_reporter_combined_tu.cpp b/src/catch2/reporters/catch_reporter_combined_tu.cpp
@@ -154,29 +154,32 @@ namespace Catch {
 
     void defaultListListeners( std::ostream& out,
                                std::vector<ListenerDescription> const& descriptions ) {
-        const auto maxNameLen =
-            std::max_element( descriptions.begin(),
-                              descriptions.end(),
-                              []( ListenerDescription const& lhs,
-                                  ListenerDescription const& rhs ) {
-                                  return lhs.name.size() < rhs.name.size();
-                              } )
-                ->name.size();
-
         out << "Registered listeners:\n";
-        for ( auto const& desc : descriptions ) {
-            out << TextFlow::Column( static_cast<std::string>( desc.name ) +
-                                     ':' )
-                           .indent( 2 )
-                           .width( maxNameLen + 5 ) +
-                       TextFlow::Column( desc.description )
-                           .initialIndent( 0 )
-                           .indent( 2 )
-                           .width( CATCH_CONFIG_CONSOLE_WIDTH - maxNameLen - 8 )
-                << '\n';
-        }
 
-        out << '\n' << std::flush;
+        if(!descriptions.empty()) {
+            const auto maxNameLen =
+                std::max_element( descriptions.begin(),
+                                  descriptions.end(),
+                                  []( ListenerDescription const& lhs,
+                                      ListenerDescription const& rhs ) {
+                                      return lhs.name.size() < rhs.name.size();
+                                  } )
+                    ->name.size();
+
+            for ( auto const& desc : descriptions ) {
+                out << TextFlow::Column( static_cast<std::string>( desc.name ) +
+                                         ':' )
+                               .indent( 2 )
+                               .width( maxNameLen + 5 ) +
+                           TextFlow::Column( desc.description )
+                               .initialIndent( 0 )
+                               .indent( 2 )
+                               .width( CATCH_CONFIG_CONSOLE_WIDTH - maxNameLen - 8 )
+                    << '\n';
+            }
+
+            out << '\n' << std::flush;
+        }
     }
 
     void defaultListTags( std::ostream& out,