THUAI6/CAPI/cpp/grpc/include/google/protobuf/has_bits.h

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#ifndef GOOGLE_PROTOBUF_HAS_BITS_H__
#define GOOGLE_PROTOBUF_HAS_BITS_H__

#include <google/protobuf/stubs/common.h>
#include <google/protobuf/port.h>

// Must be included last.
#include <google/protobuf/port_def.inc>

#ifdef SWIG
#error "You cannot SWIG proto headers"
#endif

namespace google
{
    namespace protobuf
    {
        namespace internal
        {

            template<size_t doublewords>
            class HasBits
            {
            public:
                PROTOBUF_NDEBUG_INLINE constexpr HasBits() :
                    has_bits_{}
                {
                }

                PROTOBUF_NDEBUG_INLINE void Clear()
                {
                    memset(has_bits_, 0, sizeof(has_bits_));
                }

                PROTOBUF_NDEBUG_INLINE uint32_t& operator[](int index)
                {
                    return has_bits_[index];
                }

                PROTOBUF_NDEBUG_INLINE const uint32_t& operator[](int index) const
                {
                    return has_bits_[index];
                }

                bool operator==(const HasBits<doublewords>& rhs) const
                {
                    return memcmp(has_bits_, rhs.has_bits_, sizeof(has_bits_)) == 0;
                }

                bool operator!=(const HasBits<doublewords>& rhs) const
                {
                    return !(*this == rhs);
                }

                void Or(const HasBits<doublewords>& rhs)
                {
                    for (size_t i = 0; i < doublewords; i++)
                        has_bits_[i] |= rhs[i];
                }

                bool empty() const;

            private:
                uint32_t has_bits_[doublewords];
            };

            template<>
            inline bool HasBits<1>::empty() const
            {
                return !has_bits_[0];
            }

            template<>
            inline bool HasBits<2>::empty() const
            {
                return !(has_bits_[0] | has_bits_[1]);
            }

            template<>
            inline bool HasBits<3>::empty() const
            {
                return !(has_bits_[0] | has_bits_[1] | has_bits_[2]);
            }

            template<>
            inline bool HasBits<4>::empty() const
            {
                return !(has_bits_[0] | has_bits_[1] | has_bits_[2] | has_bits_[3]);
            }

            template<size_t doublewords>
            inline bool HasBits<doublewords>::empty() const
            {
                for (size_t i = 0; i < doublewords; ++i)
                {
                    if (has_bits_[i])
                        return false;
                }
                return true;
            }

        }  // namespace internal
    }      // namespace protobuf
}  // namespace google

#include <google/protobuf/port_undef.inc>

#endif  // GOOGLE_PROTOBUF_HAS_BITS_H__