absl::down

Overload of down_cast for references. Use like this: absl::down_cast<T&>(foo). The code is slightly convoluted because we're still using the pointer form of dynamic cast. (The reference form throws an exception if it fails.)

Synopsis

Declared in <absl/base/casts.h>

template<
    typename To,
    typename From>
[[nodiscard]]
To
down_cast(From& f);

Description

There's no need for a special const overload either for the pointer or the reference form. If you call down_cast with a const T&, the compiler will just bind From to const T.

Return Value

f, downcast to To.

Note	The return value should not be discarded.

Parameters

Name

Description

The source reference to downcast.

Created with MrDocs