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-rw-r--r--third_party/BUILD.gn1
-rw-r--r--third_party/base/stl_util.h27
-rw-r--r--third_party/third_party.gyp3
3 files changed, 30 insertions, 1 deletions
diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index 8e143aa348..27b602379f 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -273,6 +273,7 @@ source_set("pdfium_base") {
"base/numerics/safe_conversions_impl.h",
"base/numerics/safe_math.h",
"base/numerics/safe_math_impl.h",
+ "base/stl_util.h",
"base/template_util.h",
]
}
diff --git a/third_party/base/stl_util.h b/third_party/base/stl_util.h
new file mode 100644
index 0000000000..fcbe5882a2
--- /dev/null
+++ b/third_party/base/stl_util.h
@@ -0,0 +1,27 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
+#define PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
+
+#include <vector>
+
+namespace pdfium {
+
+// To treat a possibly-empty vector as an array, use these functions.
+// If you know the array will never be empty, you can use &*v.begin()
+// directly, but that is undefined behaviour if |v| is empty.
+template <typename T>
+inline T* vector_as_array(std::vector<T>* v) {
+ return v->empty() ? nullptr : &*v->begin();
+}
+
+template <typename T>
+inline const T* vector_as_array(const std::vector<T>* v) {
+ return v->empty() ? nullptr : &*v->begin();
+}
+
+} // namespace pdfium
+
+#endif // PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
diff --git a/third_party/third_party.gyp b/third_party/third_party.gyp
index 79368b5a68..df5341d44a 100644
--- a/third_party/third_party.gyp
+++ b/third_party/third_party.gyp
@@ -265,11 +265,12 @@
'base/logging.h',
'base/macros.h',
'base/nonstd_unique_ptr.h',
- 'base/template_util.h',
'base/numerics/safe_conversions.h',
'base/numerics/safe_conversions_impl.h',
'base/numerics/safe_math.h',
'base/numerics/safe_math_impl.h',
+ 'base/stl_util.h',
+ 'base/template_util.h',
],
},
],