编译报错/data/client.cpp:1633:33: error: 'apsara' has not been declared

[michael200892458]

/data/client.cpp:1630:29: error: 'apsara' has not been declared
parameterList["from"] = apsara::ToString(beginTime);
^
/data/client.cpp:1631:27: error: 'apsara' has not been declared
parameterList["to"] = apsara::ToString(endTime);
^
/data/client.cpp:1633:33: error: 'apsara' has not been declared
parameterList["powerSql"] = apsara::ToString(powerSql);
^
/data/client.cpp:1635:37: error: 'apsara' has not been declared
httpHeader[X_LOG_BODYRAWSIZE] = apsara::ToString(body.length());

 请问apsara这个在哪个头文件中