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common/bit_field: Make BitField trivially copyable 

This makes the class much more flexible and doesn't make performing
copies with classes that contain a bitfield member a pain.

Given BitField instances are only intended to be used within unions, the
fact the full storage value would be copied isn't a big concern (only
sizeof(union_type) would be copied anyways).

While we're at it, provide defaulted move constructors for consistency.
This commit is contained in:
Lioncash 2019-03-07 16:32:10 -05:00 committed by fearlessTobi
parent 1fbda5518e
commit c47c24bbd2
1 changed files with 7 additions and 5 deletions
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12
src/common/bit_field.h
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@ -125,8 +125,6 @@ private:
using StorageTypeWithEndian = typename AddEndian<StorageType, EndianTag>::type; using StorageTypeWithEndian = typename AddEndian<StorageType, EndianTag>::type;
public: public:
constexpr BitField& operator=(const BitField&) = default;
/// Constants to allow limited introspection of fields if needed /// Constants to allow limited introspection of fields if needed
static constexpr std::size_t position = Position; static constexpr std::size_t position = Position;
static constexpr std::size_t bits = Bits; static constexpr std::size_t bits = Bits;
@ -162,9 +160,13 @@ public:
BitField(T val) = delete; BitField(T val) = delete;
BitField& operator=(T val) = delete; BitField& operator=(T val) = delete;
// Force default constructor to be created constexpr BitField() noexcept = default;
// so that we can use this within unions
constexpr BitField() = default; constexpr BitField(const BitField&) noexcept = default;
constexpr BitField& operator=(const BitField&) noexcept = default;
constexpr BitField(BitField&&) noexcept = default;
constexpr BitField& operator=(BitField&&) noexcept = default;
constexpr operator T() const { constexpr operator T() const {
return Value(); return Value();