[demo] Old ternary format demo

clang-format-ternary-example.cpp

@@ -0,0 +1,37 @@
+// clang-format ternary operator formatting example
+
+#include <string>
+
+struct MockProcess
+{
+    std::string read_std_output();
+    std::string read_std_error();
+};
+
+// Case 1: ternary in an assignment — the whole expression exceeds the column limit,
+// so a line break is needed somewhere. Where and how differs between the two settings.
+void example_assignment(bool success, MockProcess* proc)
+{
+    // Fits on one line — both settings leave it alone:
+    auto& short_name = success ? proc->read_std_output() : proc->read_std_error();
+
+    // Does not fit on one line — settings diverge:
+    std::string long_variable_name_here =
+        success ? proc->read_std_output() : proc->read_std_error();
+}
+
+// Case 2: chained ternary in an assignment — PenaltyBreakAssignment keeps the first
+// condition on the assignment line; BreakBeforeTernaryOperators and AlignOperands
+// then control how the remaining chain is indented.
+void example_chained(int value)
+{
+    // Fits on one line — both settings leave it alone:
+    int result = value < 0 ? -1 : value == 0 ? 0 : 1;
+
+    // Does not fit on one line — settings diverge:
+    int long_result_variable = value < 0        ? -100
+                               : value == 0     ? 0
+                               : value < 100    ? 100
+                               : value < 100000 ? 100000
+                                                : 9999999;
+}