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-rw-r--r--third_party/base/stl_util.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/third_party/base/stl_util.h b/third_party/base/stl_util.h
index 795414b59f..96947f5e53 100644
--- a/third_party/base/stl_util.h
+++ b/third_party/base/stl_util.h
@@ -44,6 +44,13 @@ ResultType CollectionSize(const Collection& collection) {
return pdfium::base::checked_cast<ResultType>(collection.size());
}
+// Convenience routine for "int-fected" code, to handle signed indicies. The
+// compiler can deduce the type, making this more convenient than the above.
+template <typename IndexType, typename Collection>
+bool IndexInBounds(const Collection& collection, IndexType index) {
+ return index >= 0 && index < CollectionSize<IndexType>(collection);
+}
+
// Track the addition of an object to a set, removing it automatically when
// the ScopedSetInsertion goes out of scope.
template <typename T>