diff options
author | Lioncash <mathew1800@gmail.com> | 2018-07-20 14:49:13 -0400 |
---|---|---|
committer | Lioncash <mathew1800@gmail.com> | 2018-07-20 15:00:58 -0400 |
commit | 0a0b3c4b9ff55020ef490106ff8f1d12c8f122e4 (patch) | |
tree | 35e7886a5d09f822badff4efa4f617e214a57cee /src | |
parent | c1c9ab31e80a182d03765658191bfd3a6c8a691f (diff) |
ipc_helpers: Add PushEnum() member function to ResponseBuilder
Allows pushing strongly-typed enum members without the need to always
cast them at the call sites.
Note that we *only* allow strongly-typed enums in this case. The reason
for this is that strongly typed enums have a guaranteed defined size, so
the size of the data being pushed is always deterministic. With regular
enums this can be a little more error-prone, so we disallow them.
This function simply uses the underlying type of the enum to determine
the size of the data. For example, if an enum is defined as:
enum class SomeEnum : u16 {
SomeEntry
};
if PushEnum(SomeEnum::SomeEntry); is called, then it will push a
u16-size amount of data.
Diffstat (limited to 'src')
-rw-r--r-- | src/core/hle/ipc_helpers.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/core/hle/ipc_helpers.h b/src/core/hle/ipc_helpers.h index 24605a273..8b5b06f31 100644 --- a/src/core/hle/ipc_helpers.h +++ b/src/core/hle/ipc_helpers.h @@ -175,6 +175,25 @@ public: void Push(const First& first_value, const Other&... other_values); /** + * Helper function for pushing strongly-typed enumeration values. + * + * @tparam Enum The enumeration type to be pushed + * + * @param value The value to push. + * + * @note The underlying size of the enumeration type is the size of the + * data that gets pushed. e.g. "enum class SomeEnum : u16" will + * push a u16-sized amount of data. + */ + template <typename Enum> + void PushEnum(Enum value) { + static_assert(std::is_enum_v<Enum>, "T must be an enum type within a PushEnum call."); + static_assert(!std::is_convertible_v<Enum, int>, + "enum type in PushEnum must be a strongly typed enum."); + Push(static_cast<std::underlying_type_t<Enum>>(value)); + } + + /** * @brief Copies the content of the given trivially copyable class to the buffer as a normal * param * @note: The input class must be correctly packed/padded to fit hardware layout. |