SkPDF: Glyph validation change

src/pdf/SkScopeExit.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkScopeExit_DEFINED
+#define SkScopeExit_DEFINED
+
+#include "SkTypes.h"
+
+/**
+* sk_at_scope_end(stmt) evaluates stmt when the current scope ends.

[bungeman-skia, 2016/08/26 19:47:05]

SK_AT_SCOPE_EXIT

[hal.canary, 2016/08/26 19:49:01]

Done.

+*
+* E.g.
+*
+* int x = 5;
+* {
+*    SK_AT_SCOPE_EXIT(x--);
+*    SkASSERT(x == 5);
+* }
+* SkASSERT(x == 4);
+*/
+template <typename Fn>
+class SkScopeExit {
+public:
+    SkScopeExit(Fn f) : fFn(std::move(f)) {}
+    ~SkScopeExit() { fFn(); }
+
+private:
+    Fn fFn;
+
+    SkScopeExit(           const SkScopeExit& ) = delete;
+    SkScopeExit& operator=(const SkScopeExit& ) = delete;
+    SkScopeExit(                 SkScopeExit&&) = delete;
+    SkScopeExit& operator=(      SkScopeExit&&) = delete;
+};
+
+template <typename Fn>
+inline SkScopeExit<Fn> SkMakeScopeExit(Fn&& fn) {
+    return {std::move(fn)};
+}
+
+#define SK_AT_SCOPE_EXIT(stmt)                              \
+    SK_UNUSED auto&& SK_MACRO_APPEND_LINE(at_scope_exit_) = \
+        SkMakeScopeExit([&]() { stmt; });
+
+#endif  // SkScopeExit_DEFINED