c++ - Two objects in namespace to be default initialized by different functions and used by class within namespace -

-

i have strange request. have namespace foo 2 declared objects of type bar, namely bar1 , bar2, initialize via constructor of class bar. sound way so:

namespace foo {     class bar;     foo::bar *bar1;     foo::bar *bar2; }  class foo::bar {     /* initialize bar1 , bar2 in constructor.      */     initializebar(); };

the reason behind shenanigan create object similar cout , cin such foo::bar1 , foo::bar2 need not defined user. more specifically, using ncurses , wish replace cout output window bar1 , cin input window bar2 , overload operators , such foo::bar1 << prints in output window see fit , foo::bar2 >> b extracts values input window , dumps b. able via c functions call need extend c++. perhaps default initialization of bar1 , bar2 accordingly?

one way use simple function pattern. keep constructor private , clients can access these objects via 2 functions. want disable copy constructor , copy assignment operator well.

// .h namespace foo {    class bar: boost noncopyable    {    public:       static bar* getinputwindow()       {          static bar s_input;          return &s_input;       }       static bar* getoutputwindow()       {          static bar s_output;          return &s_output;       }     private:       bar()       {       }    };     // global/namespace objects clients should directly use    extern bar *input;    extern bar *output; }  // .cpp namespace foo {    bar *input = bar::getinputwindow();    bar *output = bar::getoutputwindow(); }

Comments

Post a Comment

Popular posts from this blog

python - jinja2: TemplateSyntaxError: expected token ',', got 'string' -

-
i new jinja2 , having issue using python regular expression (re). in following code bold lines have error string in them. {% block content %} <div class="container"> {% l in lines %} {% if re.search(r"error", l) %} {# <<< throws error #} <b> {{ l }} </b> {% else %} {{ l }} <hr> {% endif %} {% endfor %} </div> {% endblock %} the re.search above throws following error: jinja2.exceptions.templatesyntaxerror templatesyntaxerror: expected token ',', got 'string' raw python code not supported in jinja2 template syntax. {% if re.search(r"error", l) %} replace line with {% if "error" in l %} can fix problem. if logical condition more complicated, should consider defining own custom filters (which can call python code) or complicated things in view layer. go check global namespace .
Read more

node.js - NodeJS remote terminal to Dropbear OpenWRT-Server -

-
i wandering whether there valid solution have remote terminal openwrt-box out of nodejs-app? connecting terminal works: ssh -i ~/.mykeys/id_rsa root@192.168.178.39 busybox v1.23.2 (2015-04-22 23:25:48 utc) built-in shell (ash) root@openwrt:~# the only interactive ssh solution nodejs doesn't interactive part described in readme.md following: var client = require('ssh2').client; var conn = new client(); conn.on('ready', function() { console.log('client :: ready'); conn.shell(function(err, stream) { if (err) throw err; stream.on('close', function() { console.log('stream :: close'); conn.end(); }).on('data', function(data) { console.log('stdout: ' + data); }).stderr.on('data', function(data) { console.log('stderr: ' + data); }); stream.end('ls -l\nexit\n'); }); }).connect({ host: '192.168.100.100', port: 22, username...
Read more

Qt4: how to send QString inside a struct via QSharedMemory -

-
i have struct struct control_data{ int column_number; qstring cell; }; i need send thread of qsharememory. read can't because qstring contains pointers inside. other ways? you have serialize struct byte array. can convert qstring const char* this: mystring.tostdstring().c_str(); but serializing qstring should work. the first step serialize struct qdatastream using qt, example here . then once struct can read , written can pass shared memory. a complete example of using qsharedmemory can found here . here relevant code: // first, test whether shared memory segment attached process. // if so, detach if (sharedmem.isattached()) { sharedmem.detach(); } ... qbuffer buffer; buffer.open( qbuffer::readwrite ); qdatastream out( &buffer ); out << youstruct; int size = buffer.size(); // size of int + size of qstring in bytes if ( !sharedmem.create( size ) ) { return; } // write shared memory sharedmem.lock(); char *to = (char*...
Read more