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CPP QUESTIONS

Complexity analysis of loop with limited looping time
Complexity analysis of loop with limited looping time
this will help Intuitively it is O(1) because as n increases the runtime does not increase after a certain point. However, this is an edge case, as were n bounded by a much higher number, say the maximum value of an int, it would seem to be no differ
TAG : cpp
Date : November 28 2020, 09:01 AM , By : Deepak Suri
Boost test fails with enum classes inside namespaces
Boost test fails with enum classes inside namespaces
With these it helps You need to define the operator inside the namespace if you want to make use of ADL.
TAG : cpp
Date : November 28 2020, 09:01 AM , By : Massimo
is this a function declaration?
is this a function declaration?
Hope that helps TEST is a macro. After the macro is expanded, this will be a normal function definition (with a return type). You should be able to see this if you look up the definition of the macro.
TAG : cpp
Date : November 28 2020, 09:01 AM , By : Clinton Green
Socket recv() one byte at a time
Socket recv() one byte at a time
seems to work fine Calling recv() one byte at a time will negatively impact performance. There is a certain amount of overhead on each call -- the transition to kernel mode, file descriptor lookup, dispatch to the protocol-specific driver, buffer/que
TAG : cpp
Date : November 28 2020, 09:01 AM , By : Labban
C++ Glibc Detected error. Double Free or corruption
C++ Glibc Detected error. Double Free or corruption
With these it helps Your bug is undefined behavior in is_member().is_member() fails to initialize the vowel bool.
TAG : cpp
Date : November 28 2020, 09:01 AM , By : Laura Ballam
OpenCV - How to write IplImage array in Mat form?
OpenCV - How to write IplImage array in Mat form?
To fix this issue You should view cv::Mat class as a replacement for old IplImage*. The constructor you were using is supposed to create a multidimensional cv::Mat instance, which is probably not what you were looking for. According to your IplImage*
TAG : cpp
Date : November 28 2020, 09:01 AM , By : Carlota GV
Qt event when anything changed on the window/screen + Screenshot
Qt event when anything changed on the window/screen + Screenshot
may help you . I'm thinking of extending a QT4 application with some debug possibilities, to make it easier analyzing customer issues. The application already has a "Debug" mode, when this is enabled, a lot of log entries generated, which is hard to
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Lula Kirby
OpenGL Linker error, linking with uncompiled shader
OpenGL Linker error, linking with uncompiled shader
wish help you to fix your issue You are incorrectly checking for shader compilation success. You compare GL_COMPILE_STATUS against GLEW_OK (which is 0 and has nothing to do with OpenGL), while you should compare with GL_TRUE (which is 1). Also the co
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Thøger Amundsen
Find 4 specific corner pixels and use them with warp perspective
Find 4 specific corner pixels and use them with warp perspective
will help you Starting from an image with colored circles as markers, like:
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Raffaele Mancoletti
Cin Execution Not Working (program.exe < filewithdata.txt)
Cin Execution Not Working (program.exe < filewithdata.txt)
This might help you
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Yonoson Shick
cudaMallocManaged causes Access Violation
cudaMallocManaged causes Access Violation
will help you This problem appears to have been caused by faulty hardware or a broken CUDA installation. The OP and others have successfully run the code on other machines and platforms without error.[This community wiki has been assembled from comme
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Cynthia Coleman
How to correctly read a value from stdin into a variable
How to correctly read a value from stdin into a variable
I wish did fix the issue. I presume you want to get aux from the keyboard.std::getline takes a stream and a string. The contents of the stream up to the newline are put into the string.
TAG : cpp
Date : November 27 2020, 09:01 AM , By : raghu veer
Binary Search Tree Forgetting Every Node I Add
Binary Search Tree Forgetting Every Node I Add
This might help you You need to modify the left/right pointers directly, something like this:
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Nir Yaniv
C++ Return Value from function not same as that value in function
C++ Return Value from function not same as that value in function
Does that help You have multiple calls to count_words active (that's how recursion works) but only the last one actually returns a value.Suppose we're searching for "to". main will call count_words with "to" and the root node. That will call count_wo
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Sarvasiddhi Ajay
Microsoft Visual Studio C++, OpenCV animation
Microsoft Visual Studio C++, OpenCV animation
this will help This code will change continuously the color of the edges from white to yellow, and back.You can change the animation speed with delay.
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Éderson D'Martin Cos
C++ function pointer syntax. Why does (*) work but * not?
C++ function pointer syntax. Why does (*) work but * not?
it helps some times I am writing a program for an assignment for a post fix calculator. There are bonus points if I can do it without using an if statement (no switch or while or any comparisons). I was reading about function pointers and came up wit
TAG : cpp
Date : November 27 2020, 09:01 AM , By : Harsha
C++: Template class binary operator overloading - seg fault?
C++: Template class binary operator overloading - seg fault?
will help you std::ostream operator
TAG : cpp
Date : November 27 2020, 09:01 AM , By : alejowoods
Passing buffer between two terminals (Named Pipe)
Passing buffer between two terminals (Named Pipe)
I wish this help you I apologize for the bad title as I wasn't exactly sure how to word it. I have to make a named pipe in C++ for an assignment. I understand how the named pipe works and what each line should do, but I'm running into a problem that
TAG : cpp
Date : November 26 2020, 09:01 AM , By : Thomas Heidenreich
C++ parse sub-string to integer
C++ parse sub-string to integer
wish of those help If you have Boost, it can be done as a one-liner using boost::lexical_cast, which has an overload that takes a char pointer and a length as arguments. From all I know, this is optimized (specialized) to operate directly on the inpu
TAG : cpp
Date : November 26 2020, 09:01 AM , By : vulakaerr
Create stereo context for modern opengl
Create stereo context for modern opengl
I think the issue was by ths following , Stereoscopy support is part of the window's pixel format and not the OpenGL rendering context (although when a OpenGL RC is created it takes on the pixel format of the HDC it's created with). Set the pixel for
TAG : cpp
Date : November 26 2020, 09:01 AM , By : John Mitchell
Memory leak, when using GLM
Memory leak, when using GLM
will be helpful for those in need Since the instances aren't being created using new, they will be placed on the stack, not on the heap. Therefore, when the stack used by foo is cleared, the memory for these instances will be re-claimed.
TAG : cpp
Date : November 26 2020, 09:01 AM , By : user296854
Get Control under cursor
Get Control under cursor
To fix this issue I'm not familiar with QML, so I don't know the exact syntax for this, but it seems like you want to loop until you find the inner-most control and get the color of that. Here's some C++ish pseudo-code
TAG : cpp
Date : November 26 2020, 09:01 AM , By : Bittu
Is this proper behavior? std::map iterator invalidation
Is this proper behavior? std::map iterator invalidation
will be helpful for those in need As quoted here http://en.cppreference.com/w/cpp/container/map/rbegin
TAG : cpp
Date : November 25 2020, 09:00 AM , By : sproink
2D isometric engine - Math problems - Cube selection - diamond shape map
2D isometric engine - Math problems - Cube selection - diamond shape map
hope this fix your issue I calculate my coordinates when i create a layer with a std::vector, filled with cube objects(wich is a class of mine): , So you have
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Ambika Shrestha
Open second window in Qt
Open second window in Qt
it should still fix some issue Your uip variable is declared as PreferencesWindow, when you want it to be declared as Ui::PreferencesWindow:
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Marcel Ho
Stack Overflow error with Vectors
Stack Overflow error with Vectors
I wish this helpful for you I found my solution via assigning my Stack:reserve as 2000000. I don't know why with 3000 elements I hit stack overflow, but w/o changing my code, there is no quick solution.
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Saif
Pure Virtual Friend Class
Pure Virtual Friend Class
it helps some times Since friendship is not inherited, you need to wrap all the functionality that relies on friendship into protected functions of the base class B. This will let all classes deriving from B access the functionality of A that needs "
TAG : cpp
Date : November 25 2020, 09:00 AM , By : SgtBigSmoke
Object initialization syntax in C++
Object initialization syntax in C++
wish of those help I noticed a few strange errors when I was trying to initialize constructors. It's easiest if I just show them.
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Nguyễn Thanh Tùng
Variable undefined error
Variable undefined error
wish help you to fix your issue I have this code in Forme_Composee.cpp , You have to say to which class the functions belong. Ie.Wrong:
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Jovanie Bacaltos
C++ tolower/toupper char pointer
C++ tolower/toupper char pointer
may help you . You cannot compare it to NULL. Instead you should be comparing *it to '\0'. Or better yet, use std::string and never worry about it :-)In summary, when looping over a C-style string. You should be looping until the character you see is
TAG : cpp
Date : November 25 2020, 09:00 AM , By : confusedMan
Overhead with std::function
Overhead with std::function
should help you out std::function is a type erasure class.It takes whatever it is constructed from, and erases everything except:
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Nabeel Ahmed
Is there a way to make a loop that get user input but doesn't stop if the user doesn't input anything?
Is there a way to make a loop that get user input but doesn't stop if the user doesn't input anything?
I hope this helps you . I found an answer right after posting this, so I'll make it an answer:Using kbhit() like so will solve it (at least on VS):
TAG : cpp
Date : November 25 2020, 09:00 AM , By : ADITYA DEY
OpenCV in cmake-based project: checking for contrib modules
OpenCV in cmake-based project: checking for contrib modules
it fixes the issue Now I found only way to determine it by checking for some contrib module header presense in target system, i. e. something like the following:
TAG : cpp
Date : November 25 2020, 09:00 AM , By : Ishan Tyagi
shared_ptr vs unique_ptr uses in classes and children
shared_ptr vs unique_ptr uses in classes and children
like below fixes the issue Well, this is a question of lifetime. Do you need SomeObject to outlive A? Do B send or is being use outside of this context? You have to decide when your objects dies. If you think SomeObject exists only in this context, I
TAG : cpp
Date : November 25 2020, 09:00 AM , By : scherebeo765
MFC dialog Border padding changed after switching from VS2010 to 2012 or later
MFC dialog Border padding changed after switching from VS2010 to 2012 or later
may help you . The behavior of GetWindowRect() and MoveWindow() was changed between VS2010 and 2012. In 2010, GetWindowRect() returns the dialog area without border padding, and MoveWindowRect() expects the dialog area with it; the size of the render
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Dmitry Gorobets
String rotator in C++ (bitwise rotation)
String rotator in C++ (bitwise rotation)
I wish this helpful for you You have a hex value in a string, you want to rotate it as if it was actually a number. You could just change it to an actual number, then back into a string:
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Pelle Nilsson
Custom sort vector of pair based on their values
Custom sort vector of pair based on their values
hope this fix your issue You can think of this problem as a graph problem. Each of your pairs represents an edge in a directed graph. For example, the pair (0, 2) means "there's an edge from node 0 to node 2," and the pair (2, 5) means "there's an ed
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Santosh
Pointer to const overloaded member function
Pointer to const overloaded member function
I wish did fix the issue. I have a class with const-overloaded accessor methods to a member. These accessors are declared using decltype, and it's a convention that my colleagues follow. Now, I need to create a pointer to the const version of the acc
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Satheesh Kumar Selva
how to avoid this for-loop mess in c++?
how to avoid this for-loop mess in c++?
Does that help http://howardhinnant.github.io/combinations.html
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Pakniat
Can the state of a standard C++ iostream manipulator be polled?
Can the state of a standard C++ iostream manipulator be polled?
With these it helps Polling a c++ stream for its formatting state can be accomplished with the flags() function of the std::ios_base class, from which all c++ streams inherit.The flags function comes in two varieties: a const polling function called
TAG : cpp
Date : November 24 2020, 09:00 AM , By : manish rajora
How to make sure a data type is as large as it needs to be in C++
How to make sure a data type is as large as it needs to be in C++
I think the issue was by ths following , Yes. Use a fixed width integer type defined in , usually one of the following:
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Ritesh Srivastav
Why is my first ofstream output in my else block missing the fill character?
Why is my first ofstream output in my else block missing the fill character?
I hope this helps . From cppreference.com:
TAG : cpp
Date : November 24 2020, 09:00 AM , By : Tarteel Alhaddad
Returning static/ normal arrays in recursion/another function
Returning static/ normal arrays in recursion/another function
it should still fix some issue Q 1> I know that when an array is passed, it is passed by pointer(not by reference) so any changes made to the array in the passed function gets reflected in the original function but in this case while returning that a
TAG : cpp
Date : November 24 2020, 09:00 AM , By : ishani
c++, why use const std::string & parameterName?
c++, why use const std::string & parameterName?
it should still fix some issue const is an assurance that the function will not change the argument.
TAG : cpp
Date : November 23 2020, 09:01 AM , By : Ame
expression did not evaluate to a constant in C++ VS
expression did not evaluate to a constant in C++ VS
will help you A strictly-conforming C++ implementation doesn't have variable-length arrays. Use std::vector instead:
TAG : cpp
Date : November 23 2020, 09:01 AM , By : Exterminatus
Owner object that takes pre-created values ? Wrong design?
Owner object that takes pre-created values ? Wrong design?
will help you EDITRead the question. You do not need a special container class. You need a vector of std::unique_ptr.
TAG : cpp
Date : November 23 2020, 09:01 AM , By : Deepika Rao
Cannot use Macro in a C++ constructor?
Cannot use Macro in a C++ constructor?
this one helps. In situations when __VA_ARGS__ is empty (e.g. when expanding Macro( m_Foo1, 1 )) your macro will generate the following entry in the constructor initializer list
TAG : cpp
Date : November 23 2020, 09:01 AM , By : Dung Nguyen Van
vector is loosing mat4 information
vector is loosing mat4 information
I wish this help you I have a List of Entities I want to update and than render. For updating: , You're update()ing Entity copies with your current range for:
TAG : cpp
Date : November 22 2020, 02:59 PM , By : verticalsleep
Invalid declarator before with map of struct?
Invalid declarator before with map of struct?
To fix this issue Syntax issues aside, your code smells Java. In C++ where functions are first-class citizens, you do not need to create callback classess for every possible callback. Instead, you simply pass function-like objects - either a pointer
TAG : cpp
Date : November 22 2020, 02:59 PM , By : Arktikh
std::initializer_list to return member variables returns incorrect values
std::initializer_list to return member variables returns incorrect values
help you fix your problem std::initializer_list is not a container, you cannot use it to return a list of items from a function. When you write the following
TAG : cpp
Date : November 22 2020, 02:59 PM , By : Zeba Ali
Unable to use Boost + Qt in Mac
Unable to use Boost + Qt in Mac
will help you It appears you're treating warnings as errors and Boost currently has an outstanding issue where BOOST_STATIC_ASSERT causes a warning on GCC and Clang:https://svn.boost.org/trac/boost/ticket/7242
TAG : cpp
Date : November 22 2020, 02:59 PM , By : jagjit singh Saini
Passing template function and overload as function argument
Passing template function and overload as function argument
I hope this helps you . There are no partial specializations for function templates. But I think you might have a bigger misunderstanding: "Is is possible to mix template functions and overloads when passing a function pointer ..." Overload resolutio
TAG : cpp
Date : November 22 2020, 02:59 PM , By : Atakishiyev Nicat
non standard extension warning when searching in a vector of unique_ptrs
non standard extension warning when searching in a vector of unique_ptrs
this will help find_if returns the iterator to the matching element by value, and you're trying to bind that to a non-const reference, which is illegal. The VC++ compiler has an infamous extension that allows this, but thankfully generates a warning
TAG : cpp
Date : November 22 2020, 02:59 PM , By : Paris Duane
Qt Windows x64 build succeeds in IDE but not on the command line
Qt Windows x64 build succeeds in IDE but not on the command line
I hope this helps you . I have a Qt project I'm trying to automate. On Windows I build for both 32-bit and 64-bit platforms. I am using Visual Studio 2013. I have the following Qt Kits installed: Desktop Qt 5.5.1 MSVC2013 32bit, and Desktop Qt 5.5.1
TAG : cpp
Date : November 22 2020, 02:59 PM , By : Prahwein
condition_variable::wait_for method not returning - even after the timeout
condition_variable::wait_for method not returning - even after the timeout
I hope this helps . As suggested by @Zan Lynx, the culprit was pragma pack statement. I initially used only pragma pack(1) to byte align some structures. This affected many of mutex structures to 1 byte alignment.I changed the pragma pack(1) statemen
TAG : cpp
Date : November 22 2020, 02:59 PM , By : arathi ballamudi
boost::asio usage in self-contained class
boost::asio usage in self-contained class
like below fixes the issue Is this what you're after:Move the io_service into the class (not by reference). And all usages as well.
TAG : cpp
Date : November 22 2020, 02:59 PM , By : user4578022
CGAL triangulation with constraints changes points coords
CGAL triangulation with constraints changes points coords
hope this fix your issue No point coordinate can be changed. The only thing I can see that can happen is that your constraints intersects and the intersection point is added into the triangulation (and is mistaken for an input point). Of course this
TAG : cpp
Date : November 22 2020, 02:59 PM , By : Cody Phanekham
How to resolve an ambiguous reference caused by a conflicting identifier from inline namespace
How to resolve an ambiguous reference caused by a conflicting identifier from inline namespace
hop of those help? Inline namespace scoped variables have static storage duration (internal linking). So declaring
TAG : cpp
Date : November 22 2020, 02:42 PM , By : deborahhellen
When UTF8 emoji character is removed from NSMutableString the conversion to std::string fails
When UTF8 emoji character is removed from NSMutableString the conversion to std::string fails
Does that help NSString assumes that strings are made of 16 bit units. For Emoji characters that is not true, they are made of two 16 bit units. If the last character of a string is an Emoji character, and you decrease the length by one, then you hav
TAG : cpp
Date : November 22 2020, 02:42 PM , By : Ese Erigha
XOR of two strings of 0s and 1s
XOR of two strings of 0s and 1s
Any of those help No. You can't simply XOR two strings like this str1 ^ str2 (^ is not overloaded for strings to do this).Iterate over the strings and XOR the chars step by step. You will even need to 'implement the XOR on chars' yourself (since ^ is
TAG : cpp
Date : November 22 2020, 02:42 PM , By : audrey goeson

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