请教：C++里，函数调用时，连续多个括号，是什么意思啊？

silwoods 2018-11-30 05:36:58

请教：C++里，函数调用时，后面连续多个括号，是什么意思啊？

这种是C++ 新标准里加的语法么？以前好像没看到过这样用的

         boost::program_options::options_description opts;

         

         opts.add_options()

         ("help,h", "Print this help message and exit.")

         ("server-rpc-endpoint,s", bpo::value<string>()->implicit_value("ws://127.0.0.1:8090"), "Server websocket RPC endpoint")

         ("server-rpc-user,u", bpo::value<string>(), "Server Username")

         ("server-rpc-password,p", bpo::value<string>(), "Server Password")

         ("rpc-endpoint,r", bpo::value<string>()->implicit_value("127.0.0.1:8091"), "Endpoint for wallet websocket RPC to listen on")

         ("rpc-tls-endpoint,t", bpo::value<string>()->implicit_value("127.0.0.1:8092"), "Endpoint for wallet websocket TLS RPC to listen on")

         ("rpc-tls-certificate,c", bpo::value<string>()->implicit_value("server.pem"), "PEM certificate for wallet websocket TLS RPC")

         ("rpc-http-endpoint,H", bpo::value<string>()->implicit_value("127.0.0.1:8093"), "Endpoint for wallet HTTP RPC to listen on")

         ("daemon,d", "Run the wallet in daemon mode" )

         ("wallet-file,w", bpo::value<string>()->implicit_value("wallet.json"), "wallet to load")

         ("chain-id", bpo::value<string>(), "chain ID to connect to")

         ("suggest-brain-key", "Suggest a safe brain key to use for creating your account")

         ("version,v", "Display version information");

...全文

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mirro 2018-12-01

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函数的参数列表

silwoods 2018-11-30

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非常感谢，：）

引用 1 楼 zjq9931 的回复:

重载了小括号()运算符

蠓虫带着秤砣飞 2018-11-30

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重载了小括号()运算符


   class options_description;

    /** Class which provides convenient creation syntax to option_description. 
     */        
    class BOOST_PROGRAM_OPTIONS_DECL options_description_easy_init {
    public:
        options_description_easy_init(options_description* owner);

        options_description_easy_init&
        operator()(const char* name,
                   const char* description);

        options_description_easy_init&
        operator()(const char* name,
                   const value_semantic* s);
        
        options_description_easy_init&
        operator()(const char* name,
                   const value_semantic* s,
                   const char* description);
       
    private:
        options_description* owner;
    };