Hello,
I'm having a strange problem when setting an string value in a protocol
buffer. Keep in mind that my experience in C++ and PB is rather limited.
The .proto file looks more or less like this:
----------------------
package buffers;
message AttributeValue {
enum Type {
INT64 = 0;
UINT64 = 1;
INT32 = 2;
UINT32 = 3;
FLOAT = 4;
DOUBLE = 5;
INVALID = 6;
STRING = 7;
}
required Type type = 1;
optional int32 i32 = 2;
optional int64 i64 = 3;
optional uint32 ui32 = 4;
optional uint64 ui64 = 5;
optional float f = 6;
optional double d = 7;
optional string str = 8;
}
----------------------
I also have a function to convert a class "VariableDatatype" into an
AttributeValue buffer. It looks like this:
void BufferConverter::attribute_value(const VariableDatatype &s_atv,
buffers::AttributeValue &b_atv)
{
switch(s_atv.type()) {
case VariableDatatype::Type::STRING:
b_atv.set_type(buffers::AttributeValue::STRING);
b_atv.set_str(s_atv.str());
break;
}
}
In the main function I try to create a protocol buffer containing the
string stored in VariableDatatype by using the attribute_value() function
in the way shown below:
main-1()
{
buffers::AttributeValue *bs = new buffers::AttributeValue();
c.attribute_value(ds, *bs);
}
This doesn't work.
If I print the value of b_atv inside the attribute_value function using gdb
I get something like:
gdb print b_atv
26 = (buffers::AttributeValue &) @0x6496b0: {<google::protobuf::Message> =
{<google::protobuf::MessageLite> = {
However, when I print *bs from inside main-1, I get something different:
gdb print *bs
$36 = {<google::protobuf::Message> = {<google::protobuf::MessageLite> =
{_vptr.MessageLite = 0x642650 <vtable for buffers::AttributeValue+16>
I can work around the problem by using the following main-2:
main-2()
{
buffers::AttributeValue *bs = new buffers::AttributeValue();
buffers::AttributeValue &bss = *bs;
c.attribute_value(ds, bss);
}
but that's not very elegant. Can someone point me to the right way to
handle this?
Thank you
A.
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