C++ “no match for operator=“ error in lambda function

See also questions close to this topic

• why constructor of a grand parent is deleted in this case?

  The compiler is complaining the constructor of D is deleted because of ill forming why ?

  #include<iostream>
  using namespace std;
  
  class A
  {
     int x;
     public:
     A(int i) { x = i; }
     void print() { cout << x; }
  };
  
  class B: virtual public A
  {
     public:
        B():A(10) { }
  };
  
  class C: virtual public A 
  {
     public:
        C():A(10) { }
  };
  
  class D: public B, public C {
  };
  
  int main()
  {
     D d;
     d.print();
     return 0;
  }
  

  Output

  *main.cpp:37:4: error: use of deleted function 'D::D()'
    D d;
      ^
  main.cpp:32:7: note: 'D::D()' is implicitly deleted because the default definition would be ill-formed:
   class D: public B, public C {
         ^*
  
• Comparison operator for std::vector<T> fails to find comparison operator for T

  The following very simple code won't compile

  #include <vector>
  #include <string>
  
  
  namespace Foobar {
      struct Test {
          std::string f;
          std::uint16_t uuid;
      };
  }
  
  bool operator==(const Foobar::Test& lhs, const Foobar::Test& rhs){
      return lhs.f == rhs.f && lhs.uuid == rhs.uuid;
  }
  
  
  int main(){
  
      std::vector<Foobar::Test> a;
      std::vector<Foobar::Test> b;
  
      if(a==b){
  
      }
  
      return 0;
  }
  

  https://godbolt.org/g/zn6UgJ

  Won't compile in any of the compilers I have.

  While the following

  #include <vector>
  #include <string>
  
  
  namespace Foobar {
      struct Test {
          std::string f;
          std::uint16_t uuid;
      };
  
      bool operator==(const Foobar::Test& lhs, const Foobar::Test& rhs){
          return lhs.f == rhs.f && lhs.uuid == rhs.uuid;
      }
  }
  
  
  
  int main(){
  
      std::vector<Foobar::Test> a;
      std::vector<Foobar::Test> b;
  
      if(a==b){
  
      }
  
      return 0;
  }
  

  https://godbolt.org/g/o4pc1b

  Compiles just fine, which makes me think std::vector<T> comparison operator looks in the namespace of T, why won't it consider the global namespace?
• Winapi edit controls disappear when moving window outside of the screen

  I'm creating several EDIT elements with a for loop. When I move the window outside the screen and then back inside, the EDIT controls disappear, along with a line in the WM_PAINT event.

  The "create" event:

  case WM_CREATE:
      for( int i =0; i < 4; i++ ){
          text = CreateWindow("EDIT","text",WS_VISIBLE | WS_CHILD , 0,i*40+100,100,10, hwnd , NULL, NULL, NULL);
      }
  
      // Other elements
      break;
  

  The "paint" event:

  case WM_PAINT:
      {
          hdc = GetDC(hwnd);
          SetRect(&secondbackground, 0, 70, 800, 500);
          FillRect(hdc, &secondbackground, CreateSolidBrush(RGB(0,200,200)) );
          ReleaseDC(hwnd, hdc);
  
          hdc = GetDC(hwnd);
          SetRect(&secondbackground, 0, 0, 800, 20);
          FillRect(hdc, &secondbackground, CreateSolidBrush(RGB(0,100,200)) );
          ReleaseDC(hwnd, hdc);
  
          hdc = BeginPaint( hwnd, &ps );
          MoveToEx(hdc,1,52,NULL);
          LineTo(hdc,100,200);
          EndPaint( hwnd, &ps );
  
          hdc = GetDC(hwnd);
          SetPixel(hdc,300,300,RGB(255,255,255));
          EndPaint( hwnd, &ps );
      }
      break;
  
• Is There Any Way To Remove This Placeholder Variable?

  Consider this C# lambda function:

  public delegate int IntToInt(int x);
  
  IntToInt f = (x => x);
  

  Maybe I'm being overly fussy but I try to avoid unnecessary variables when I can. I tried

  IntToInt f = (=>);
  

  but that doesn't work. I don't mind having the dummy variable there but I was wondering if there's any way to remove the x since it's only a placeholder.

  If you're wondering why I'm asking this came up in a LINQ expression when I simply wanted to return all the selected fields--hence I had

  .Select(field => field);
  

  which I thought might be improved by removing the field since it's just a placeholder.

  I suppose I could do something like this:

  public delegate object Identity (object x);
  

  Then:

  Identity id = (x => x);
  

  And then

  .Select(id);
  

  But I was hoping I could simply remove the dummy variable from the lambda.
• AWS Lambda function running DescribeAccountStatus doesn't execute in NodeJS

  I have the following code running in Lambda that is triggered by an SNS message containing the status ID of a CreateAccount function. When run locally it works fine, but when triggered in a Lambda the CloudWatch logs show nothing.

  var AWS = require("aws-sdk");
  var sns = new AWS.SNS();
  var organizations = new AWS.Organizations({region: 'us-east-1'});
  
  
  exports.handler = (event, context, callback) => {
  
      var message = event.Records[0].Sns.Message;
      console.log("From sns:", message);
  
      var obj = JSON.parse(message);
          var name = obj.name;
          console.log("Name :", obj.name);
          var email = obj.email;
          console.log("Email :", obj.email);
          var budget = obj.budget;
          console.log("Budget :", obj.budget);
          var awsaccount = obj.awsaccount;
          console.log("Account Name :", obj.awsaccount);
          var adminaccount = obj.adminaccount;
          console.log("Admin account name :", obj.adminaccount);
          var adminpassword = obj.adminpassword;
          console.log("Admin password :", obj.adminpassword);
          var accStatusId = obj.statusid;
          //var accStatusId = (accStatusId.replace(/\"/g, ""));
          console.log("Status ID :", obj.statusid);
  
  
  context.succeed(message);
  
  
          // Fetch status of account creation and account ID
          var AccStatusParams = {
              CreateAccountRequestId: accStatusId
          };
          checkStatus(AccStatusParams);
  
  };
  
  function checkStatus(AccStatusParams){
  
    organizations.describeCreateAccountStatus(AccStatusParams, function(err, data) {
      if (err) console.log(err, err.stack);
      else { console.log(data);
        console.log("Account = ", JSON.stringify(data.CreateAccountStatus.AccountId));
        console.log("Status = ", JSON.stringify(data.CreateAccountStatus.State));
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• Serverless upload file to S3 cannot open

  I'm trying to use serverless (Node.js) for file uploading

  const contentType = event.headers['Content-Type'] || event.headers['content-type'];
  const bb = new busboy({ headers: { 'content-type': contentType }});
  
  // When file load
  bb.on('file', function (fieldname, file, filename, encoding, mimetype) {
      console.log(fieldname, filename, encoding, mimetype);
      console.log(file);
  
      const key = 'upload/' + filename;
      var s3obj = new AWS.S3({
          params: {
              Bucket: 'fileupload',
              Key: key,
              ACL: 'public-read',
              ContentEncoding: encoding,
              ContentType: mimetype,
          }
      });
  
      s3obj.upload({ Body: file })
        .on('httpUploadProgress', function(evt) { console.log(evt); })
        .send(function(err, data) { console.log(err, data) });
  
  })
  
  bb.end(event.body);
  
  callback(null, response({ status: 'success' }));
  

  After ran this code S3 successfully created the file, but if I uploaded an image or other non-text files (not .txt, .csv), the file size will differ and the file cannot open.

  May I know which part of my code goes wrong?
• Save Errors in Problems tab Eclipse

  I know we can see the syntax error when we run a project or a class.

  but i want to catch the compile error when we BUILD a project.

  is there a way to catch the errors and save it to a textfile? or even read the errors in the Problem tab.

  

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• Prestashop 1.7 smarty_internal_templatebase

  When I turn on debugging in PrestaShop 1.7, I see errors like this, I do not understand how to fix it.

  - in smarty_internal_templatebase.php(157) : eval()'d code line 497
  - at ErrorHandler->handleError('8', 'Undefined index: search_controller_url', 
  '/homepages/19/d729760136/htdocs/clickandbuilds/PrestaShop/embout_/vendor/
  prestashop/smarty/sysplugins/smarty_internal_templatebase.php(157) : 
  eval()'d code', '497', array('_smarty_tpl' => object(SmartyDevTemplate))) in 
  - smarty_internal_templatebase.php(157) : eval()'d code line 497
  - at content_5b5185945ba282_57656684(object(SmartyDevTemplate)) in smarty_internal_templatebase.php(157) : eval()'d code line 135
  - at Smarty_Internal_TemplateBase->fetch('index.tpl', null, 'layouts/layout-full-width.tpl', object(SmartyDev), false, true, false) in SmartyDev.php line 41
  - at SmartyDev->fetch('index.tpl', null, 'layouts/layout-full-width.tpl') in FrontController.php line 669
  - at FrontControllerCore->smartyOutputContent('index.tpl') in FrontController.php line 653
  - at FrontControllerCore->display() in Controller.php line 225
  - at ControllerCore->run() in Dispatcher.php line 428
  - at DispatcherCore->dispatch() in index.php line 28
  

  @MrSmile This is the source code of layouts/layout-full-width.tpl :

  {**
  * 2007-2017 PrestaShop
  *
  * NOTICE OF LICENSE
  *
  * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
  * that is bundled with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * https://opensource.org/licenses/AFL-3.0
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@prestashop.com so we can send you a copy immediately.
  *
  * DISCLAIMER
  *
  * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
  * versions in the future. If you wish to customize PrestaShop for your
  * needs please refer to http://www.prestashop.com for more information.
  *
  * @author    PrestaShop SA <contact@prestashop.com>
  * @copyright 2007-2017 PrestaShop SA
  * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL- 3.0)
  * International Registered Trademark & Property of PrestaShop SA
  *}
  {extends file='layouts/layout-both-columns.tpl'}
  
  {block name='left_column'}{/block}
  {block name='right_column'}{/block}
  
  {block name='content_wrapper'}
  <div id="content-wrapper" class="col-xs-12">
  {hook h="displayContentWrapperTop"}
  {block name='content'}
    <p>Hello world! This is HTML5 Boilerplate.</p>
  {/block}
  {hook h="displayContentWrapperBottom"}
  </div>
  {/block}
  

  It could be because of a specific module?
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