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LibIPC: Support sending Variants over IPC

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The format is quite simply the type index followed by the type in its
own native encoding; just implementing the receive side with static
typing is a bit convoluted. The only limitation of this implementation
is that the variant type has to contain an Empty somewhere as it is not
default constructible otherwise.

Co-authored-by: Ali Mohammad Pur <mpfard@serenityos.org>
This commit is contained in:
kleines Filmröllchen 2022-11-09 17:05:04 +01:00 • committed by Tim Flynn
parent 5b4818df22
commit a06b277471
4 changed files with 56 additions and 0 deletions
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13
Userland/Libraries/LibIPC/Encoder.h
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@ -9,6 +9,7 @@
#include <AK/Concepts.h>
#include <AK/HashMap.h>
#include <AK/StdLibExtras.h>
#include <AK/Variant.h>
#include <LibCore/SharedCircularQueue.h>
#include <LibIPC/Forward.h>
#include <LibIPC/Message.h>
@ -49,6 +50,7 @@ public:
Encoder& operator<<(URL const&);
Encoder& operator<<(Dictionary const&);
Encoder& operator<<(File const&);
Encoder& operator<<(AK::Empty const&);
template<typename K, typename V>
Encoder& operator<<(HashMap<K, V> const& hashmap)
{
@ -87,6 +89,17 @@ public:
return *this;
}
// Note: We require any encodeable variant to have Empty as its first variant, as only possibly-empty variants can be default constructed.
// The default constructability is required by generated IPC message marshalling code.
template<typename... VariantTypes>
Encoder& operator<<(AK::Variant<AK::Empty, VariantTypes...> const& variant)
{
// Note: This might be either u8 or size_t depending on the size of the variant; both are encodeable.
*this << variant.index();
variant.visit([this](auto const& underlying_value) { *this << underlying_value; });
return *this;
}
template<Enum T>
Encoder& operator<<(T const& enum_value)
{