empiredan opened a new issue, #1220:
URL: https://github.com/apache/incubator-pegasus/issues/1220
Some classes such as `rpc_channel` are based on template class
`customized_id`. Currently they can only be formatted by
[{fmt}](https://github.com/fmtlib/fmt) using `to_string()`. For example, in
`src/runtime/rpc/asio_net_provider.cpp`, there are codes as below:
```c++
CHECK(channel == RPC_CHANNEL_TCP || channel == RPC_CHANNEL_UDP,
"invalid given channel {}",
channel.to_string());
```
To simplify the formatting, operator `<<` can just be overloaded which is
supported by [{fmt}](https://github.com/fmtlib/fmt).
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