Transform provider error codes - It is possible that different service providers return service errors using different semantics.
转换提供者错误代码——不同的服务提供者会使用不同的语义来返回服务错误。
Corresponding to the different possible error types, there are error codes that are defined in the Boost headers.
与不同的可能错误类型对应，Boos t头文件定义了相应的错误代码。
Corresponding to the different possible error types, there are error codes that are defined in the Boost headers.
与不同的可能错误类型对应，Boos t头文件定义了相应的错误代码。
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