Cpp: Fix the unused parameter warning in the sempred function. (#4171)
Signed-off-by: FireWolf <austere.j@gmail.com>
diff --git a/tool/resources/org/antlr/v4/tool/templates/codegen/Cpp/Cpp.stg b/tool/resources/org/antlr/v4/tool/templates/codegen/Cpp/Cpp.stg
index e557fc8..f1cc57f 100644
--- a/tool/resources/org/antlr/v4/tool/templates/codegen/Cpp/Cpp.stg
+++ b/tool/resources/org/antlr/v4/tool/templates/codegen/Cpp/Cpp.stg
@@ -272,13 +272,13 @@
>>
RuleSempredFunctionHeader(r, actions) ::= <<
-bool <r.name>Sempred(<r.ctxType> *_localctx, size_t predicateIndex);
+bool <r.name>Sempred([[maybe_unused]] <r.ctxType> *_localctx, size_t predicateIndex);
>>
RuleSempredFunction(r, actions) ::= <<
<! Called for both lexer and parser. But only one of them is actually available. Testing for the parser directly
generates a warning, however. So do the check via the factory instead. !>
-bool <if (r.factory.g.lexer)><lexer.name><else><parser.name><endif>::<r.name>Sempred(<r.ctxType> *_localctx, size_t predicateIndex) {
+bool <if (r.factory.g.lexer)><lexer.name><else><parser.name><endif>::<r.name>Sempred([[maybe_unused]] <r.ctxType> *_localctx, size_t predicateIndex) {
switch (predicateIndex) {
<actions: {index | case <index>: return <actions.(index)>}; separator=";\n">;
