Fix tests for C++23's multi-arg index operator

Closes #2744

CMake/CatchMiscFunctions.cmake

@@ -46,7 +46,6 @@ function(add_warnings_to_targets targets)
         set(CHECKED_WARNING_FLAGS
           "-Wabsolute-value"
           "-Wall"
-          "-Wc++20-compat"
           "-Wcall-to-pure-virtual-from-ctor-dtor"
           "-Wcast-align"
           "-Wcatch-value"

tests/SelfTest/Baselines/compact.sw.approved.txt

@@ -331,7 +331,7 @@ MatchersRanges.tests.cpp:<line number>: passed: inner_lists_are_empty.front(), I
 MatchersRanges.tests.cpp:<line number>: passed: has_empty{}, !IsEmpty() for: {?} not is empty
 MatchersRanges.tests.cpp:<line number>: passed: unrelated::ADL_empty{}, IsEmpty() for: {?} is empty
 Message.tests.cpp:<line number>: passed: with 7 messages: 'a := 1' and 'b := 2' and 'c := 3' and 'a + b := 3' and 'a+b := 3' and 'c > b := true' and 'a == 1 := true'
-Message.tests.cpp:<line number>: passed: with 7 messages: 'std::vector<int>{1, 2, 3}[0, 1, 2] := 3' and 'std::vector<int>{1, 2, 3}[(0, 1)] := 2' and 'std::vector<int>{1, 2, 3}[0] := 1' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
+Message.tests.cpp:<line number>: passed: with 7 messages: 'custom_index_op<int>{1, 2, 3}[0, 1, 2] := 0' and 'custom_index_op<int>{1, 2, 3}[(0, 1)] := 0' and 'custom_index_op<int>{1, 2, 3}[0] := 0' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
 Message.tests.cpp:<line number>: passed: with 11 messages: '("comma, in string", "escaped, \", ") := "escaped, ", "' and '"single quote in string,'," := "single quote in string,',"' and '"some escapes, \\,\\\\" := "some escapes, \,\\"' and '"some, ), unmatched, } prenheses {[<" := "some, ), unmatched, } prenheses {[<"' and ''"' := '"'' and ''\'' := '''' and '',' := ','' and ''}' := '}'' and '')' := ')'' and ''(' := '('' and ''{' := '{''
 ToStringGeneral.tests.cpp:<line number>: passed: true with 1 message: 'i := 2'
 ToStringGeneral.tests.cpp:<line number>: passed: true with 1 message: '3'

tests/SelfTest/Baselines/compact.sw.multi.approved.txt

@@ -329,7 +329,7 @@ MatchersRanges.tests.cpp:<line number>: passed: inner_lists_are_empty.front(), I
 MatchersRanges.tests.cpp:<line number>: passed: has_empty{}, !IsEmpty() for: {?} not is empty
 MatchersRanges.tests.cpp:<line number>: passed: unrelated::ADL_empty{}, IsEmpty() for: {?} is empty
 Message.tests.cpp:<line number>: passed: with 7 messages: 'a := 1' and 'b := 2' and 'c := 3' and 'a + b := 3' and 'a+b := 3' and 'c > b := true' and 'a == 1 := true'
-Message.tests.cpp:<line number>: passed: with 7 messages: 'std::vector<int>{1, 2, 3}[0, 1, 2] := 3' and 'std::vector<int>{1, 2, 3}[(0, 1)] := 2' and 'std::vector<int>{1, 2, 3}[0] := 1' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
+Message.tests.cpp:<line number>: passed: with 7 messages: 'custom_index_op<int>{1, 2, 3}[0, 1, 2] := 0' and 'custom_index_op<int>{1, 2, 3}[(0, 1)] := 0' and 'custom_index_op<int>{1, 2, 3}[0] := 0' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
 Message.tests.cpp:<line number>: passed: with 11 messages: '("comma, in string", "escaped, \", ") := "escaped, ", "' and '"single quote in string,'," := "single quote in string,',"' and '"some escapes, \\,\\\\" := "some escapes, \,\\"' and '"some, ), unmatched, } prenheses {[<" := "some, ), unmatched, } prenheses {[<"' and ''"' := '"'' and ''\'' := '''' and '',' := ','' and ''}' := '}'' and '')' := ')'' and ''(' := '('' and ''{' := '{''
 ToStringGeneral.tests.cpp:<line number>: passed: true with 1 message: 'i := 2'
 ToStringGeneral.tests.cpp:<line number>: passed: true with 1 message: '3'

tests/SelfTest/Baselines/console.sw.approved.txt

@@ -2740,9 +2740,9 @@ Message.tests.cpp:<line number>
 
 Message.tests.cpp:<line number>: PASSED:
 with messages:
-  std::vector<int>{1, 2, 3}[0, 1, 2] := 3
-  std::vector<int>{1, 2, 3}[(0, 1)] := 2
-  std::vector<int>{1, 2, 3}[0] := 1
+  custom_index_op<int>{1, 2, 3}[0, 1, 2] := 0
+  custom_index_op<int>{1, 2, 3}[(0, 1)] := 0
+  custom_index_op<int>{1, 2, 3}[0] := 0
   (helper_1436<int, int>{12, -12}) := { 12, -12 }
   (helper_1436<int, int>(-12, 12)) := { -12, 12 }
   (1, 2) := 2

tests/SelfTest/Baselines/console.sw.multi.approved.txt

@@ -2738,9 +2738,9 @@ Message.tests.cpp:<line number>
 
 Message.tests.cpp:<line number>: PASSED:
 with messages:
-  std::vector<int>{1, 2, 3}[0, 1, 2] := 3
-  std::vector<int>{1, 2, 3}[(0, 1)] := 2
-  std::vector<int>{1, 2, 3}[0] := 1
+  custom_index_op<int>{1, 2, 3}[0, 1, 2] := 0
+  custom_index_op<int>{1, 2, 3}[(0, 1)] := 0
+  custom_index_op<int>{1, 2, 3}[0] := 0
   (helper_1436<int, int>{12, -12}) := { 12, -12 }
   (helper_1436<int, int>(-12, 12)) := { -12, 12 }
   (1, 2) := 2

tests/SelfTest/Baselines/tap.sw.approved.txt

@@ -659,7 +659,7 @@ ok {test-number} - unrelated::ADL_empty{}, IsEmpty() for: {?} is empty
 # CAPTURE can deal with complex expressions
 ok {test-number} - with 7 messages: 'a := 1' and 'b := 2' and 'c := 3' and 'a + b := 3' and 'a+b := 3' and 'c > b := true' and 'a == 1 := true'
 # CAPTURE can deal with complex expressions involving commas
-ok {test-number} - with 7 messages: 'std::vector<int>{1, 2, 3}[0, 1, 2] := 3' and 'std::vector<int>{1, 2, 3}[(0, 1)] := 2' and 'std::vector<int>{1, 2, 3}[0] := 1' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
+ok {test-number} - with 7 messages: 'custom_index_op<int>{1, 2, 3}[0, 1, 2] := 0' and 'custom_index_op<int>{1, 2, 3}[(0, 1)] := 0' and 'custom_index_op<int>{1, 2, 3}[0] := 0' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
 # CAPTURE parses string and character constants
 ok {test-number} - with 11 messages: '("comma, in string", "escaped, \", ") := "escaped, ", "' and '"single quote in string,'," := "single quote in string,',"' and '"some escapes, \\,\\\\" := "some escapes, \,\\"' and '"some, ), unmatched, } prenheses {[<" := "some, ), unmatched, } prenheses {[<"' and ''"' := '"'' and ''\'' := '''' and '',' := ','' and ''}' := '}'' and '')' := ')'' and ''(' := '('' and ''{' := '{''
 # Capture and info messages

tests/SelfTest/Baselines/tap.sw.multi.approved.txt

@@ -657,7 +657,7 @@ ok {test-number} - unrelated::ADL_empty{}, IsEmpty() for: {?} is empty
 # CAPTURE can deal with complex expressions
 ok {test-number} - with 7 messages: 'a := 1' and 'b := 2' and 'c := 3' and 'a + b := 3' and 'a+b := 3' and 'c > b := true' and 'a == 1 := true'
 # CAPTURE can deal with complex expressions involving commas
-ok {test-number} - with 7 messages: 'std::vector<int>{1, 2, 3}[0, 1, 2] := 3' and 'std::vector<int>{1, 2, 3}[(0, 1)] := 2' and 'std::vector<int>{1, 2, 3}[0] := 1' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
+ok {test-number} - with 7 messages: 'custom_index_op<int>{1, 2, 3}[0, 1, 2] := 0' and 'custom_index_op<int>{1, 2, 3}[(0, 1)] := 0' and 'custom_index_op<int>{1, 2, 3}[0] := 0' and '(helper_1436<int, int>{12, -12}) := { 12, -12 }' and '(helper_1436<int, int>(-12, 12)) := { -12, 12 }' and '(1, 2) := 2' and '(2, 3) := 3'
 # CAPTURE parses string and character constants
 ok {test-number} - with 11 messages: '("comma, in string", "escaped, \", ") := "escaped, ", "' and '"single quote in string,'," := "single quote in string,',"' and '"some escapes, \\,\\\\" := "some escapes, \,\\"' and '"some, ), unmatched, } prenheses {[<" := "some, ), unmatched, } prenheses {[<"' and ''"' := '"'' and ''\'' := '''' and '',' := ','' and ''}' := '}'' and '')' := ')'' and ''(' := '('' and ''{' := '{''
 # Capture and info messages

tests/SelfTest/Baselines/xml.sw.approved.txt

@@ -2911,13 +2911,13 @@ Nor would this
   </TestCase>
   <TestCase name="CAPTURE can deal with complex expressions involving commas" tags="[capture][messages]" filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
-      std::vector&lt;int>{1, 2, 3}[0, 1, 2] := 3
+      custom_index_op&lt;int>{1, 2, 3}[0, 1, 2] := 0
     </Info>
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
-      std::vector&lt;int>{1, 2, 3}[(0, 1)] := 2
+      custom_index_op&lt;int>{1, 2, 3}[(0, 1)] := 0
     </Info>
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
-      std::vector&lt;int>{1, 2, 3}[0] := 1
+      custom_index_op&lt;int>{1, 2, 3}[0] := 0
     </Info>
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
       (helper_1436&lt;int, int>{12, -12}) := { 12, -12 }

tests/SelfTest/Baselines/xml.sw.multi.approved.txt

@@ -2911,13 +2911,13 @@ Nor would this
   </TestCase>
   <TestCase name="CAPTURE can deal with complex expressions involving commas" tags="[capture][messages]" filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
-      std::vector&lt;int>{1, 2, 3}[0, 1, 2] := 3
+      custom_index_op&lt;int>{1, 2, 3}[0, 1, 2] := 0
     </Info>
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
-      std::vector&lt;int>{1, 2, 3}[(0, 1)] := 2
+      custom_index_op&lt;int>{1, 2, 3}[(0, 1)] := 0
     </Info>
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
-      std::vector&lt;int>{1, 2, 3}[0] := 1
+      custom_index_op&lt;int>{1, 2, 3}[0] := 0
     </Info>
     <Info filename="tests/<exe-name>/UsageTests/Message.tests.cpp" >
       (helper_1436&lt;int, int>{12, -12}) := { 12, -12 }

tests/SelfTest/UsageTests/Message.tests.cpp

@@ -255,10 +255,24 @@ std::ostream& operator<<(std::ostream& out, helper_1436<T1, T2> const& helper) {
 #pragma clang diagnostic ignored "-Wunused-value"
 #endif
 
+namespace {
+    template <typename T>
+    struct custom_index_op {
+        constexpr custom_index_op( std::initializer_list<T> ) {}
+        constexpr T operator[]( size_t ) { return T{}; }
+#if defined( __cpp_multidimensional_subscript ) && \
+    __cpp_multidimensional_subscript >= 202110L
+        constexpr T operator[]( size_t, size_t, size_t ) const noexcept {
+            return T{};
+        }
+#endif
+    };
+}
+
 TEST_CASE("CAPTURE can deal with complex expressions involving commas", "[messages][capture]") {
-    CAPTURE(std::vector<int>{1, 2, 3}[0, 1, 2],
-            std::vector<int>{1, 2, 3}[(0, 1)],
-            std::vector<int>{1, 2, 3}[0]);
+    CAPTURE(custom_index_op<int>{1, 2, 3}[0, 1, 2],
+            custom_index_op<int>{1, 2, 3}[(0, 1)],
+            custom_index_op<int>{1, 2, 3}[0]);
     CAPTURE((helper_1436<int, int>{12, -12}),
             (helper_1436<int, int>(-12, 12)));
     CAPTURE( (1, 2), (2, 3) );