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base: add Reconstructible::conditional method

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The new 'conditional' method simplifies the typical use case for
'Constructible' objects where the constructed/destructed state depends
on a configuration parameter. The method alleviates the need to
re-implement the logic again and again.

The patch also removes the 'Reconstructible' constructor arguments
because they are unused.

Fixes #3006
This commit is contained in:
Norman Feske
2018-10-01 14:04:50 +02:00
committed by Christian Helmuth
parent fe303f0e46
commit 7d641d5f1f
4 changed files with 20 additions and 11 deletions
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20
repos/base/include/util/reconstructible.h
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@@ -136,6 +136,19 @@ class Genode::Reconstructible : Noncopyable
*/
bool is_constructed() const { return constructed(); }
/**
* Construct or destruct volatile object according to 'condition'
*/
template <typename... ARGS>
void conditional(bool condition, ARGS &&... args)
{
if (condition && !constructed())
construct(args...);
if (!condition && constructed())
destruct();
}
/**
* Access contained object
*/
@@ -161,11 +174,8 @@ class Genode::Reconstructible : Noncopyable
template <typename MT>
struct Genode::Constructible : Reconstructible<MT>
{
template <typename... ARGS>
Constructible(ARGS &&...)
:
Reconstructible<MT>((typename Reconstructible<MT>::Lazy *)nullptr)
{ }
Constructible()
: Reconstructible<MT>((typename Reconstructible<MT>::Lazy *)nullptr) { }
};
#endif /* _INCLUDE__UTIL__RECONSTRUCTIBLE_H_ */