tongsucn opened a new issue, #65:
URL: https://github.com/apache/pulsar-client-cpp/issues/65
## Motivation
Currently `class Message` provides two groups of functions to access the
message's payload:
1. `Message::getData` and `Message::getLength`.
2. `getDataAsString`: this is a wrapper of the two above.
The second one performs `std::string`'s construction, which contains
expensive memory copy. If `class Message` can provide a new function that gives
payload's ownership to the caller like this:
```cpp
// In SharedBuffer.h add new function:
bool SharedBuffer::pop(std::string &target) {
// Swap *data_ into target, then reset ptr_, readIdx_ etc.
}
// Message.cc
void Message::moveDataIntoString(std::string &data) {
// Move payload into data via SharedBuffer::pop.
}
```
In high-throughput scenario, these new functions could bring significant
performance improvement at data consuming.
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