[Click] strange string

[Koen Segers]

On Wednesday 05 April 2006 01:12, Koen Segers wrote:
> Hi,
>
> I just found something strange.
> I've created a function called add_detailed_info that has a String
> parameter. When I call this function in the following manner, it doesn't
> compile.
>
> _dump->add_detailed_info("Hello with xid=" + _info->get_network_id() + "
> and seqnr=" + _info->get_broadcast_seqnr() + " and size=" +
> _info->get_network_size());
>
> Compiling this gives:
> elements/pdhcp/pdhcp_hello_generator.cc:105: error: invalid operands of
>    types `const char*' and `const char[12]' to binary `operator+'
>
>
> When I change it to the following, all works wonderful.
> String str = "Hello with xid=";
> 		str += _info->get_network_id();
> 		str += " and seqnr=";
> 		str += _info->get_broadcast_seqnr();
> 		str += " and size=";
> 		str += _info->get_network_size();
> 		_dump->add_detailed_info(str);
>

Oops, this way I get incorrect output:
Hello with xid=g and seqnr= and size=(
I believe this is some representation of my integers. Probably ASCII.

>
> Now the question is, how is this possible?
> I saw that the string class has overloaded the operator+ for many cases. Is
> there a case missing for what I'm trying to do? Or maybe the operator()?
>
> xid is a uint32_t
> broadcast_seqnr = int
> network_size = int
>
> greetz

-- 

Koen Segers
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