Design of Orocos Logger class

Singleton mode : Create global objects with local static (non-local static possible initialization problems)

Select One of the implementations (Std::cerr, printf, file) by #ifdef, #ifndef, #if defined, and other conditional compilations

Setting some default values through environment variables

if"ORO_LOGLEVEL"0 ){...}

Using nested classes to manage internal implementation log level (Info, Waring, Error) control

class Logger {    struct D;     D* d;  //}

Use the constructors and destructors of local variables to set the function associated with the scope .

Logger::In::Instd::string& modname)         : oldmod( Logger::log().getLogModule() )  // 记录当前设置，用于恢复{    Logger::log().in(modname);  // 在构造函数中设置某些功能}Logger::In::~In(){    Logger::log().out(oldmod);  // 离开作用域，在析构函数中恢复}

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Design of Orocos Logger class