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c++protocol-buffers

Protobuf oneof has_field private

I have made a simple protobuf file to reproduce my problem:

syntax = "proto3";

package proto;

message Test {
    uint32 test1 = 1;
    oneof param {
        uint32 test2 = 2;
        bool test3 = 3;
    }
}

When I generate the c++ code the oneof's has_param() member function is private. Is it normal ? How do I know if the oneof is set ?

By the way I tried with protobuf 3.12.4 and 3.21.9 and got the same result.

Solution

  • Refer to the documentation for Protobuf C++ generated code.

    The generator creates a method param_case(), which returns enumeration type that identifies which field inside the oneof is present. If the oneof is empty, it returns PARAM_NOT_SET.