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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.
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@ -111,12 +111,6 @@
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template <std::size_t Position, std::size_t Bits, typename T>
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struct BitField {
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private:
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// We hide the copy assigment operator here, because the default copy
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// assignment would copy the full storage value, rather than just the bits
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// relevant to this particular bit field.
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// We don't delete it because we want BitField to be trivially copyable.
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constexpr BitField& operator=(const BitField&) = default;
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// UnderlyingType is T for non-enum types and the underlying type of T if
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// T is an enumeration. Note that T is wrapped within an enable_if in the
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// former case to workaround compile errors which arise when using
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@ -163,9 +157,13 @@ public:
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BitField(T val) = delete;
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BitField& operator=(T val) = delete;
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// Force default constructor to be created
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// so that we can use this within unions
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constexpr BitField() = default;
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constexpr BitField() noexcept = default;
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constexpr BitField(const BitField&) noexcept = default;
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constexpr BitField& operator=(const BitField&) noexcept = default;
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constexpr BitField(BitField&&) noexcept = default;
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constexpr BitField& operator=(BitField&&) noexcept = default;
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constexpr FORCE_INLINE operator T() const {
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return Value();
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