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Merge pull request #2716 from yuriks/decentralized-result

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Decentralize ResultCode
This commit is contained in:
bunnei 2017-05-26 11:59:57 -04:00 • committed by GitHub
commit 61decd84cc
33 changed files with 385 additions and 300 deletions
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65
src/common/bit_field.h
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@ -108,7 +108,7 @@
* symptoms.
*/
#pragma pack(1)
template <std::size_t position, std::size_t bits, typename T>
template <std::size_t Position, std::size_t Bits, typename T>
struct BitField {
private:
// We hide the copy assigment operator here, because the default copy
@ -117,7 +117,45 @@ private:
// We don't delete it because we want BitField to be trivially copyable.
BitField& operator=(const BitField&) = default;
// StorageType is T for non-enum types and the underlying type of T if
// T is an enumeration. Note that T is wrapped within an enable_if in the
// former case to workaround compile errors which arise when using
// std::underlying_type<T>::type directly.
using StorageType = typename std::conditional_t<std::is_enum<T>::value, std::underlying_type<T>,
std::enable_if<true, T>>::type;
// Unsigned version of StorageType
using StorageTypeU = std::make_unsigned_t<StorageType>;
public:
/// Constants to allow limited introspection of fields if needed
static constexpr size_t position = Position;
static constexpr size_t bits = Bits;
static constexpr StorageType mask = (((StorageTypeU)~0) >> (8 * sizeof(T) - bits)) << position;
/**
* Formats a value by masking and shifting it according to the field parameters. A value
* containing several bitfields can be assembled by formatting each of their values and ORing
* the results together.
*/
static constexpr FORCE_INLINE StorageType FormatValue(const T& value) {
return ((StorageType)value << position) & mask;
}
/**
* Extracts a value from the passed storage. In most situations prefer use the member functions
* (such as Value() or operator T), but this can be used to extract a value from a bitfield
* union in a constexpr context.
*/
static constexpr FORCE_INLINE T ExtractValue(const StorageType& storage) {
if (std::numeric_limits<T>::is_signed) {
std::size_t shift = 8 * sizeof(T) - bits;
return (T)((storage << (shift - position)) >> shift);
} else {
return (T)((storage & mask) >> position);
}
}
// This constructor and assignment operator might be considered ambiguous:
// Would they initialize the storage or just the bitfield?
// Hence, delete them. Use the Assign method to set bitfield values!
@ -126,23 +164,18 @@ public:
// Force default constructor to be created
// so that we can use this within unions
BitField() = default;
constexpr BitField() = default;
FORCE_INLINE operator T() const {
return Value();
}
FORCE_INLINE void Assign(const T& value) {
storage = (storage & ~GetMask()) | (((StorageType)value << position) & GetMask());
storage = (storage & ~mask) | FormatValue(value);
}
FORCE_INLINE T Value() const {
if (std::numeric_limits<T>::is_signed) {
std::size_t shift = 8 * sizeof(T) - bits;
return (T)((storage << (shift - position)) >> shift);
} else {
return (T)((storage & GetMask()) >> position);
}
return ExtractValue(storage);
}
// TODO: we may want to change this to explicit operator bool() if it's bug-free in VS2015
@ -151,20 +184,6 @@ public:
}
private:
// StorageType is T for non-enum types and the underlying type of T if
// T is an enumeration. Note that T is wrapped within an enable_if in the
// former case to workaround compile errors which arise when using
// std::underlying_type<T>::type directly.
typedef typename std::conditional<std::is_enum<T>::value, std::underlying_type<T>,
std::enable_if<true, T>>::type::type StorageType;
// Unsigned version of StorageType
typedef typename std::make_unsigned<StorageType>::type StorageTypeU;
FORCE_INLINE StorageType GetMask() const {
return (((StorageTypeU)~0) >> (8 * sizeof(T) - bits)) << position;
}
StorageType storage;
static_assert(bits + position <= 8 * sizeof(T), "Bitfield out of range");