Upstream version 9.38.198.0

[platform/framework/web/crosswalk.git] / src / mojo / public / c / system / macros.h

diff --git a/src/mojo/public/c/system/macros.h b/src/mojo/public/c/system/macros.h
index f1e3c7d..564ee60 100644 (file)
--- a/src/mojo/public/c/system/macros.h
+++ b/src/mojo/public/c/system/macros.h
@@ -26,6 +26,20 @@
 #define MOJO_WARN_UNUSED_RESULT
 #endif
 
+#ifdef __cplusplus
+// Used to explicitly mark the return value of a function as unused. If you are
+// really sure you don't want to do anything with the return value of a function
+// that has been marked WARN_UNUSED_RESULT, wrap it with this. Example:
+//
+//   scoped_ptr<MyType> my_var = ...;
+//   if (TakeOwnership(my_var.get()) == SUCCESS)
+//     mojo_ignore_result(my_var.release());
+//
+template <typename T>
+inline void mojo_ignore_result(const T&) {
+}
+#endif
+
 // Assert things at compile time. (|msg| should be a valid identifier name.)
 // This macro is currently C++-only, but we want to use it in the C core.h.
 // Use like:
@@ -33,9 +47,12 @@
 #if __cplusplus >= 201103L
 #define MOJO_COMPILE_ASSERT(expr, msg) static_assert(expr, #msg)
 #elif defined(__cplusplus)
-namespace mojo { template <bool> struct CompileAssert {}; }
+namespace mojo {
+template <bool>
+struct CompileAssert {};
+}
 #define MOJO_COMPILE_ASSERT(expr, msg) \
-    typedef ::mojo::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
+  typedef ::mojo::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
 #else
 #define MOJO_COMPILE_ASSERT(expr, msg)
 #endif