diff options
Diffstat (limited to 'base/callback_internal.h')
| -rw-r--r-- | base/callback_internal.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/base/callback_internal.h b/base/callback_internal.h index 244504b..92ea80a 100644 --- a/base/callback_internal.h +++ b/base/callback_internal.h @@ -166,6 +166,11 @@ struct CallbackParamTraits<ScopedVector<T> > { // In C++11, std::forward would replace all uses of this function. However, it // is impossible to implement a general std::forward with C++11 due to a lack // of rvalue references. +// +// In addition to Callback/Bind, this is used by PostTaskAndReplyWithResult to +// simulate std::forward() and forward the result of one Callback as a +// parameter to another callback. This is to support Callbacks that return +// the movable-but-not-copyable types whitelisted above. template <typename T> T& CallbackForward(T& t) { return t; } |