Security: replace operator[] with at

For std::string and std::vector, replace operator[] with at.  This was
done using an automated process.  See README.hardening for details.

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/pdf-parse-content.cc b/examples/pdf-parse-content.cc
index 0394e938..7f11be05 100644
--- a/examples/pdf-parse-content.cc
+++ b/examples/pdf-parse-content.cc
@@ -74,7 +74,7 @@ int main(int argc, char* argv[])
             usage();
         }
 
-        QPDFObjectHandle page = pages[pageno-1];
+        QPDFObjectHandle page = pages.at(pageno-1);
         QPDFObjectHandle contents = page.getKey("/Contents");
         ParserCallbacks cb;
         QPDFObjectHandle::parseContentStream(contents, &cb);