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What is the best practice when declaring a user defined array?


What is the best practice when declaring a user defined array?

By : Abir Fakhro
Date : September 24 2020, 04:00 AM
hope this fix your issue As it is tagged C, I will try to answer in the scope of C language. The second case I think is more prefered than the first one. First of all, for the first case, your array will have constant size and you cannot do realloc on it if a user gives input let's say more than 100, as you will get an error that int[100] is not assignable. For the second case, it is assumed that the given input is the sufficient size to create a constant size array because for the same reasons you cannot realloc to change the size of the array but at least you know the input is given by the user. My suggestion would be to use a dynamic array which is a bit harder to manipulate as you may have memory leaks, for example, when the elements in your dynamic array are not primitive types but structs or other types that require memory allocation. However, using dynamic array, you can realloc the size to make it bigger or smaller to save some memory space. I am new to Stack Overflow so maybe your question is something deeper that my answer will not be enough. BTW, I hope it will give you some hint.
P.S. Static arrays are always faster to be used, so if you are sure that the number of elements will not be more than a certain number, then it is better to use constant size array.
code :


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Declaring variable as Folder in Outlook 2003 generates Compile Error User-Defined type not defined

Declaring variable as Folder in Outlook 2003 generates Compile Error User-Defined type not defined


By : Mattlab
Date : March 29 2020, 07:55 AM
help you fix your problem I save items I receive on my hard drive and name them differently. , Use Outlook.MAPIFolder instead.
Is declaring explicitly defaulted move constructor in every class that doesn't provide user-defined one a good practice?

Is declaring explicitly defaulted move constructor in every class that doesn't provide user-defined one a good practice?


By : Andre Potes
Date : March 29 2020, 07:55 AM
Any of those help Consider the following scenario. You have a class that is fine with auto-generated move constructor and destructor:
code :
class X {
      int i_;
   public:
      X(int i) : i_(i) { }
};
class X {
      int i_;
      char* buf_;
      size_t n_;
   public:
      X(int i, size_t n) : i_(i), n_(n), buf_(new char[n]) { }
      X(const X& o) : i_(o.i_), n_(o.n_), buf_(new char[o.n_]) { memcpy(buf_, o.buf_, n); }
      ~X() { delete[] buf_; }
};
Declaring variable as Internet Explorer generates Compile error: user-defined type not defined

Declaring variable as Internet Explorer generates Compile error: user-defined type not defined


By : JacobWhiteee1
Date : March 29 2020, 07:55 AM
wish helps you As mentioned, if you are going with early bound code then you will need to add the appropriate reference libraries so your program knows what it is dealing with and has access to the appropriate properties and methods. Both Microsoft Internet Controls and Microsoft HTML Object Library are "standard" and you can add these references to a project you are distributing to other users, who may be using different versions of the same Microsoft Application, without fear of the missing reference errors due to versioning.
Microsoft paid a lot of money in an anti-trust settlement in order for everyone to have MSHTML/IE. See also United States v. Microsoft Corp. Credit to user ThunderFrame for educating me on this.
code :
Dim IeApp As Object
Set IeApp As CreateObject("InternetExplorer.Application")

Dim hFile As Object
Set hFile = CreateObject("htmlFile")
Declaring variable as Excel application in Access VBA generates error: User-defined type not defined

Declaring variable as Excel application in Access VBA generates error: User-defined type not defined


By : Chrisv GalaRadio
Date : March 29 2020, 07:55 AM
To fix this issue I have an Access database and have data in an Excel worksheet. I need to use data from some of the cells in the Excel worksheet to update cells in a table in the Access database. , Try adding a set by "Dim xl As Object"
Declaring array with user-defined size before the main function

Declaring array with user-defined size before the main function


By : Naman Mahna
Date : March 29 2020, 07:55 AM
Hope this helps First of all, it is impossible to declare an array with variable sizes, as they are not legal in C++ (although they are legal in C). So you're out of luck here. Second, you want the declaration before main. Hence, you have to use either
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