What is the most efficient way of replacing duplicate elements in a list B with unique elements from another list(list A) in Qt or C++? solved What is the most efficient way of replacing duplicate elements in a list B with unique elements from another list(list A) in Qt or C++?
This will do what you think you want, but it’s totally NOT recommended. Templates (or std::swap) really are the right answer here. First, define an inline function to take void ** inline void SWAP_POINTERS2(void** p1,void** p2) { void* temp = *p1; *p1 = *p2; *p2 = temp; } Then, define a macro to perform unpleasant … Read more
Sure you can: string directory = @”C:\”; List<string> textFiles = System.IO.Directory.GetFiles(directory, “*.txt”).ToList(); // You can now you textFiles as a DataSource for your List Control you can add using System.IO directive and remove it from the above code; 1 solved C# – Display Files in a Folder on Button Click [closed]
If you want to convert this to the method syntax version, you can do this step by step. I like to start at the end and work through to the beginning: select to Select defines the source: .Select(g => g.OrderByDescending(s => s.MeasureDate).FirstOrDefault()); group is GroupBy: .GroupBy(s => s.SensorUnitId) .Select(g => g.OrderByDescending(s => s.MeasureDate).FirstOrDefault()); from the … Read more
Returning a pointer isn’t a problem as long as it points to memory that is still in scope, such as dynamically allocated memory, global data, or local variables that still exist further up the call stack. The problem with the above code is that you’re dereferencing a pointer without assigning anything to it. This: *ret_val … Read more
Cannot implicitly convert type ‘System.Array’ to ‘decimal[]’. An explicit conversion exists (are you missing a cast?) solved Cannot implicitly convert type ‘System.Array’ to ‘decimal[]’. An explicit conversion exists (are you missing a cast?)
Is it possible that in different program executions the code above is not going to work? Yes, it’s about as possible as 1+1==2. Is this correct? Absolutely. How can I solve the problem? Write and read the array rather than its address: vl_size size = vl_get_type_size(dataType); const void *means = vl_gmm_get_means(gmm) out.write(static_cast<const char*>(means), numComponents * … Read more
No. You can only use alphanumeric characters and underscores in identifiers (variable, function, and type names) in C. And the identifier cannot start with a number. Also, you can’t use certain reserved keywords. http://www.cprogrammingexpert.com/C/Tutorial/fundamentals/identifiers.aspx (link broken) UPDATE: Newer link that’s not broken: https://www.w3schools.in/c-programming/identifiers 2 solved Can I use symbols, such as (*,/,&,^), for enum in … Read more
It would be more readable if you kept the code formatting for the whole code, not just its part. But when I tried to find a main function, I didn’t find any. Therefore there is no reference to main because you haven’t implemented one, at least not in the code you posted here. solved Error … Read more
There is an option in the Visual Studio debugger to show all integral values – including byte – in hexadecimal. Right click in one of the debugger display windows (like Locals or Watch) and unselect Hexadecimal Display in the content menu. solved how to convert hexadecimal byte value to decimal in c# [closed]
In C++, we use std::array for fixed size containers: #include <array> const int ptarraysize = 256; std::array<EC_POINT*, ptarraysize> ppnt; 3 solved Using vectors in Visual studio [closed]
You can store non-copyable, non-movable objects in an unordered_set. Finding whether a given element is in the set is O(1) instead of O(n), or O(log n) if you keep the vector sorted (which is itself O(n) on insertion). unordered_set disallows duplicates. Removing a given element is O(1). In the case of a sorted vector, it’s … Read more
for (int i; i < 6; i++) should be for (int i=0; i < 6; i++) You declared variable ‘i’ but forgot to initialise the variable, so it could have any arbitrary value, not necessarily ‘0’ 1 solved C++ error C4700: uninitialized local variable ‘i’ used
CopyToDataTable is a method, you need to add the parenthesys to the method name dtChoice_2 = dtChoice.Select(“QuestionID = ‘” + QNo + “‘”).CopyToDataTable(); ^^^ 2 solved ERROR: Cannot convert method group ‘CopyToDataTable’ to non-delegate type ‘System.Data.DataTable’. Did you intend to invoke the method?
# 2dMatrix: Your matrix # x: x-coordinate of the element for which you’re searching for neighbors # y: y-coordinate of the element for which you’re searching for neighbors def nearest_elements_2dMatrix(2dMatrix, x,y): upleft = 2dMatrix[x-1][y-1] if (x-1 >= 0 and y-1>=0) else None downleft = 2dMatrix[x-1][y+1] if (x-1 >= 0 and y+1 < len(2dMatrix)) else None … Read more