THUAI6/CAPI/cpp/grpc/include/google/protobuf/stubs/macros.h

// Protocol Buffers - Google's data interchange format
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// https://developers.google.com/protocol-buffers/
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#ifndef GOOGLE_PROTOBUF_MACROS_H__
#define GOOGLE_PROTOBUF_MACROS_H__

namespace google
{
    namespace protobuf
    {

#undef GOOGLE_DISALLOW_EVIL_CONSTRUCTORS
#define GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(TypeName) \
    TypeName(const TypeName&) = delete;             \
    void operator=(const TypeName&) = delete

#undef GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS
#define GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
    TypeName() = delete;                                \
    TypeName(const TypeName&) = delete;                 \
    void operator=(const TypeName&) = delete

        // ===================================================================
        // from google3/base/basictypes.h

        // The GOOGLE_ARRAYSIZE(arr) macro returns the # of elements in an array arr.
        // The expression is a compile-time constant, and therefore can be
        // used in defining new arrays, for example.
        //
        // GOOGLE_ARRAYSIZE catches a few type errors.  If you see a compiler error
        //
        //   "warning: division by zero in ..."
        //
        // when using GOOGLE_ARRAYSIZE, you are (wrongfully) giving it a pointer.
        // You should only use GOOGLE_ARRAYSIZE on statically allocated arrays.
        //
        // The following comments are on the implementation details, and can
        // be ignored by the users.
        //
        // ARRAYSIZE(arr) works by inspecting sizeof(arr) (the # of bytes in
        // the array) and sizeof(*(arr)) (the # of bytes in one array
        // element).  If the former is divisible by the latter, perhaps arr is
        // indeed an array, in which case the division result is the # of
        // elements in the array.  Otherwise, arr cannot possibly be an array,
        // and we generate a compiler error to prevent the code from
        // compiling.
        //
        // Since the size of bool is implementation-defined, we need to cast
        // !(sizeof(a) & sizeof(*(a))) to size_t in order to ensure the final
        // result has type size_t.
        //
        // This macro is not perfect as it wrongfully accepts certain
        // pointers, namely where the pointer size is divisible by the pointee
        // size.  Since all our code has to go through a 32-bit compiler,
        // where a pointer is 4 bytes, this means all pointers to a type whose
        // size is 3 or greater than 4 will be (righteously) rejected.
        //
        // Kudos to Jorg Brown for this simple and elegant implementation.

#undef GOOGLE_ARRAYSIZE
#define GOOGLE_ARRAYSIZE(a)       \
    ((sizeof(a) / sizeof(*(a))) / \
     static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))

    }  // namespace protobuf
}  // namespace google

#endif  // GOOGLE_PROTOBUF_MACROS_H__