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CPP QUESTIONS

Mock method implementation using Google Mock
Mock method implementation using Google Mock
this one helps. You can write a custom action that will return incrementing numbers and use it in WillRepeatedly:
TAG : cpp
Date : October 31 2020, 05:57 AM , By : 1230
Are C++ floating point constants always stored in static memory?
Are C++ floating point constants always stored in static memory?
like below fixes the issue Thank you for the example. You are right that it stores the constants in the code when compiled with gcc for 64-bit mode with optimiztion off (-O0). It stores the constants in memory if you compile for 32-bit mode.If you tu
TAG : cpp
Date : October 31 2020, 05:57 AM , By : Ahmed Medien
Which one is correct about the auto type deduction?
Which one is correct about the auto type deduction?
will help you auto is determined purely in the context of the code initializing the value, not subsequent usage. Trying to deduce one of several possible alternative types based on an arbitrary amount of subsequent code would lead to effectively unbo
TAG : cpp
Date : October 31 2020, 05:57 AM , By : CWeekes
BGL: bundled object without a default constructor?
BGL: bundled object without a default constructor?
this one helps. documentation:
TAG : cpp
Date : October 30 2020, 10:01 AM , By : Wrong Frank
OpenMP and C++: private variables
OpenMP and C++: private variables
this will help It should be reiterated that your bodies variable does not just randomly appear out of nowhere; you should find out exactly where it is declared and what it is defined as. However, because you are only accessing elements of bodies and
TAG : cpp
Date : October 30 2020, 10:01 AM , By : ldm1
Define and return a function from a function?
Define and return a function from a function?
will be helpful for those in need Closures (with std::function) -using lambda functions- in C++11 are appropriate and recommended here. So have
TAG : cpp
Date : October 30 2020, 10:01 AM , By : Mr. Chand
default initialization of const qualified type with no user provided constructor
default initialization of const qualified type with no user provided constructor
To fix this issue According to the draft standard 8.5/p7.3 Initializers [dcl.init]:
TAG : cpp
Date : October 30 2020, 10:01 AM , By : Upgrayedd
Search best match of an array into a matrix using std::vector
Search best match of an array into a matrix using std::vector
it fixes the issue Here is my current code. It would be better if I had split it into a function or two more, but it is shorter this way:
TAG : cpp
Date : October 30 2020, 10:01 AM , By : Joris Fouet
Get index of checked radio button in group
Get index of checked radio button in group
This might help you That's a use case for QButtonGroup.Group your radio buttons with QButtonGroup if you haven't already. For each button, use QButtonGroup::addButton(button, id) to assign consecutive ids to your buttons, starting with zero.
TAG : cpp
Date : October 29 2020, 11:32 PM , By : Xodblux
CUDA 7.5 Visual Studio 2013 crash
CUDA 7.5 Visual Studio 2013 crash
like below fixes the issue After hours and hours of struggling, debugging, uninstalling CUDA over three times, installing Visual Studio again, I figured out that it had to do with my virus scanner..... I disabled Avast Antivirus and everything worked
TAG : cpp
Date : October 29 2020, 11:32 PM , By : brendensmall
Set swappiness for allocated memory
Set swappiness for allocated memory
wish helps you In general, you can't do something this fine-grained without a custom allocator. Stuff like mlock and posix_madvise work on a page level, and they're basically on/off switches. So for the normal heap, you'd be tuning "swappiness" (howe
TAG : cpp
Date : October 29 2020, 11:32 PM , By : onne
How to get the separating hyperplane in OpenCV SVM?
How to get the separating hyperplane in OpenCV SVM?
will help you You can use the getSupportVector function to retrieve the support vectors, and the getDecisionFunction function to retrieve the scalar bias of the decision function. I assume that you want the separating frontier only for a linear svm,
TAG : cpp
Date : October 29 2020, 11:32 PM , By : Marc Soler
Error compiling Box2D on Mac OS : EGL identifiers not found
Error compiling Box2D on Mac OS : EGL identifiers not found
wish of those help I also had the same issue ,Box2d Master is not having a stable build, try using the release build from the below linkhttps://github.com/erincatto/Box2D/releases
TAG : cpp
Date : October 29 2020, 11:32 PM , By : Raging Elephant
Ignore connected component inside another one
Ignore connected component inside another one
wish of those help You can do that using floodFill, assuming you know a point inside the shape you want to fill.Result starting from your "Channel red":
TAG : cpp
Date : October 29 2020, 11:32 PM , By : AshMan
Cyclic Dependencies in Template Class
Cyclic Dependencies in Template Class
To fix this issue This is the first solution that comes to mind: Define all three classes in the same header file. Declare the conversion constructors inside the classes, but don't provide a definition for them just yet. After all the classes are def
TAG : cpp
Date : October 29 2020, 11:32 PM , By : Kieran Sherman
How to copy Eigen matrix
How to copy Eigen matrix
it fixes the issue You can replicate a matrix by using the (wait for it) replicate function. The first parameter is how many times to repeat the rows, the second is the number of times to repeat the columns.
TAG : cpp
Date : October 29 2020, 11:32 PM , By : MCue
Cheking a pattern of bits in a sequence
Cheking a pattern of bits in a sequence
hope this fix your issue Your loop goes too far, I'm afraid. It could, for example 'find' the bit pattern '0001' in a value ~0, which consists of ones only.This will do better (I hope):
TAG : cpp
Date : October 29 2020, 11:32 PM , By : kradman
Win32 application doesn't run on startup
Win32 application doesn't run on startup
this will help When the application is started using the "Run" key, its working directory is not the one where its image file (*.exe) resides. You can change this by calling Win32 function SetCurrentDirectory at the very beginning of your main functi
TAG : cpp
Date : October 29 2020, 11:32 PM , By : Sasa Micic
std::initializer_list ambiguity in Visual Studio
std::initializer_list ambiguity in Visual Studio
This might help you I'm trying to accept a std::initializer_list into a generic constructor like so:
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Francisco Amaya
Use of undeclared identifier GluBuildMipMaps (emscripten)
Use of undeclared identifier GluBuildMipMaps (emscripten)
With these it helps I'm not too familiar with emscripten, but from some searching it looks like your option of FULL_ES2=1 means that you get the whole OpenGL ES 2.0 API. I'd guess that means that the only include directory you get is GLES2 instead of
TAG : cpp
Date : October 29 2020, 10:01 AM , By : scvoter
BGL: Is it possible to use range for of C++11 to loop over the vertices of the graph?
BGL: Is it possible to use range for of C++11 to loop over the vertices of the graph?
I think the issue was by ths following , You can, with a little bit of coding.Let's first recap how to access the vertices of a graph in bgl. If the graph g implements the VertexListGraph concept, then you can call vertices(g) which will return a std
TAG : cpp
Date : October 29 2020, 10:01 AM , By : DJSB
Overloading Recursive Function C++
Overloading Recursive Function C++
around this issue It is okay to overload it if root is member of the class and it is initialized in class constructor.
TAG : cpp
Date : October 29 2020, 10:01 AM , By : amzot
A bunch of warning was given to this simple official boost::iostream code?
A bunch of warning was given to this simple official boost::iostream code?
Any of those help Although Boost has basic support for NVCC (see ticket 3919), it is not one of the primary or additional test compilers used to test a release. For the lists of primary and additional test compilers, see the release notes for the ver
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Will Robinson
create an RBG Color QImage from a GDALDataSet
create an RBG Color QImage from a GDALDataSet
should help you out You are nearly there. The first item is that the QImage takes a buffer with the format flag. As a result, that format flag needs to either match the image you are loading from file, or else needs to be transformed. The example bel
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Collingwood Rowing
What is the difference in these two program
What is the difference in these two program
seems to work fine Function parameters are local variables of the function. They get copies of the values of the corresponding arguments.You can imagine the following function declaration
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Ryan
Emulate pthread_kill with C++ threads
Emulate pthread_kill with C++ threads
fixed the issue. Will look into that further So the answer to this question is to rely on platform dependent features and use std::thread::native_handle with pthread_kill()
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Researcher
difference between typeids of template and non-template member function pointers
difference between typeids of template and non-template member function pointers
around this issue This clearly is a compiler bug in VS 2012. It looks closely related to 775434 "decltype is buggy in VS 2012" which links to this SO question. If this is indeed the bug, then you besides upgrading to VS 2015, you could try a workarou
TAG : cpp
Date : October 29 2020, 10:01 AM , By : thomas
Using Ros to transfer frames
Using Ros to transfer frames
may help you . Per this ROS wiki article, toCvShare() returns a CvImageConstPtr which is a typedef for boost::shared_ptr.In the case of:
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Allwin Durairaj
Why do two iterators shift apart in loop?
Why do two iterators shift apart in loop?
hope this fix your issue Your code has undefined behavior. When you call erase the iterators become invalid
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Jens Pfotenhauer
Template Inheritance member fields
Template Inheritance member fields
wish of those help To resume comment:You have to replace private: by protected: to access parent members and inform that the members are dependant name: (for example by using this->)
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Black Salami
how to overload accessor and mutator operator[] in c++
how to overload accessor and mutator operator[] in c++
I hope this helps . Let's see this case with the point of view of the compiler. I present you this code:
TAG : cpp
Date : October 29 2020, 10:01 AM , By : Matclick
what should be the hash function for ip addresses?
what should be the hash function for ip addresses?
I wish this helpful for you Since IPv4 have 32-bit addresses, you don't need a hash function, you can use the IP address as is.For IPv6, XOR folding the 128 bits to 32 or 64 is probably good enough.
TAG : cpp
Date : October 29 2020, 10:01 AM , By : April
use wstring get line read file
use wstring get line read file
this one helps. I have a file that contains text, I would like to get each line from this file into a std::wstring variable.If I do this I get an error, so is it possible to use std::wstring or I'm obligate to use a std::string ? This is my code : ,
TAG : cpp
Date : October 29 2020, 06:12 AM , By : Wasim Gulistan
How to supress warnings from some files when building with g++?
How to supress warnings from some files when building with g++?
wish of those help It depends how you're building your project, and which compiler. I'm assuming you're on Linux and you're using GCC. If not, similar techniques work for Visual Studio and other compilers too.If you have a Makefile that you can easil
TAG : cpp
Date : October 29 2020, 06:12 AM , By : Matt Williams
Faster File Operations C++
Faster File Operations C++
I think the issue was by ths following , Here are some general changes which may help: I would convert the curOps to an enum rather than a string (save you the string comparisons.) Looks like you should pre-process that container and build a sequence
TAG : cpp
Date : October 29 2020, 06:12 AM , By : JohnThomas
Delete pointer and object
Delete pointer and object
this will help Your first code snippet does indeed delete the object. The pointer itself is a local variable allocated on the stack. It will be deallocated as soon as it goes out of scope. That brings up the second point--if the pointer goes out of s
TAG : cpp
Date : October 29 2020, 06:12 AM , By : Yaritza Rojas
Creating a template with default arguments based on type
Creating a template with default arguments based on type
should help you out I think your second approach isn't quite what you mean it to be. Having MinDefaultValue and MaxDefaultValue as inner template classes means that every NumericColumn template instantiation will have a separate template class. So Nu
TAG : cpp
Date : October 29 2020, 06:12 AM , By : soph
How to define pointer for a custom input iterator
How to define pointer for a custom input iterator
it fixes the issue The only thing I can find in the standard that calls out what they should refers to comes from [iterator.traits]
TAG : cpp
Date : October 29 2020, 06:12 AM , By : rat-on-a-scooter
What I am doing wrong in this binary tree program
What I am doing wrong in this binary tree program
With these it helps , This should do the trick:
TAG : cpp
Date : October 29 2020, 06:12 AM , By : Luca_Wist
C++ Infinite-loop, Issue with returning
C++ Infinite-loop, Issue with returning
I hope this helps you . The loop is not around the cout/input/determine/do something logic. It's only around the determine/do something. Move the while to before the cout and see what happens. Be sure to mark the answer that helps most as an answer.
TAG : cpp
Date : October 29 2020, 04:55 AM , By : Sunecko
How to parse an URI elegantly in Casablanca
How to parse an URI elegantly in Casablanca
I think the issue was by ths following , It seems that there are static helper functions in the URI class, e.g. uri::split_query and uri::split_path that perform exactly as requested.I found references to them after looking at this gist which uses
TAG : cpp
Date : October 29 2020, 04:55 AM , By : mathematics
Make nested type hash-able for std::unordered_set
Make nested type hash-able for std::unordered_set
seems to work fine I found simpler Solution: Add boost::hash:make Foo struct to be like that:
TAG : cpp
Date : October 29 2020, 04:55 AM , By : Kaushik
What is the difference between Pointer and strings?
What is the difference between Pointer and strings?
hope this fix your issue What is the difference between a pointer and array or they are same? As a array also works with poiter arithematic so it can be said that an array is nothing but pointer to its fitst element. , They both are different by the
TAG : cpp
Date : October 29 2020, 04:55 AM , By : sridhar
C++ fast normal random number generator
C++ fast normal random number generator
like below fixes the issue Most importantly, do you really need 100,000,000 random numbers simultaneously? The writing to and subsequent reading from RAM of all these data unavoidably requires significant time. If you only need the random numbers one
TAG : cpp
Date : October 29 2020, 04:55 AM , By : Yanchi Yu
Cannot parse datetime in pm format with booster, C++, graphlab
Cannot parse datetime in pm format with booster, C++, graphlab
it fixes the issue I was able to get the string-to-datetime conversion to work by making two small changes: Use %I for the hour on a 12-hour clock (%H is for a 24 hour clock). Use %P (upper case) for the AM/PM flag.
TAG : cpp
Date : October 29 2020, 04:55 AM , By : Moiz K
error: incompatible types in assignment of 'char*' to 'char [20]'
error: incompatible types in assignment of 'char*' to 'char [20]'
this one helps. Your constructor argument nm is, actually, not an array! Yes, I know it looks like one, because you wrote char nm[20]. But, actually, it's char* nm. That translation is performed automatically when you write an array type in a functio
TAG : cpp
Date : October 29 2020, 04:55 AM , By : Isabella Zhang
C++ --- leading zeros in filenames (CSV-files) --- storing/splitting values of a std::vector
C++ --- leading zeros in filenames (CSV-files) --- storing/splitting values of a std::vector
should help you out To generate the filename do sprintf(fileName, "%02d.csv", fileNumber);See http://www.cplusplus.com/reference/cstdio/sprintf/
TAG : cpp
Date : October 29 2020, 04:55 AM , By : MMM
reprojectImageTo3D creates just NaN Points
reprojectImageTo3D creates just NaN Points
it helps some times What I am trying to do: I want to convert the left stereo image into points with 3D-coordinates. (With the help of the disparity image and the function reprojectImageTo3D()) , I found some little errors and it seems to be work fin
TAG : cpp
Date : October 29 2020, 04:55 AM , By : Yossi happysale
Insert data in two channel matrix
Insert data in two channel matrix
I hope this helps . You probably didn't want a 2 channel matrix, but a simple 2 dimensional matrix:This following code will produce the desired output:
TAG : cpp
Date : October 29 2020, 04:46 AM , By : TDH
c++ normalize a vector to a double?
c++ normalize a vector to a double?
should help you out You're probably looking for the euclidean norm which is the geometric length of the vector and a scalar value.
TAG : cpp
Date : October 29 2020, 04:46 AM , By : Ch Naveed
Why this code will signal SIGSEGV?
Why this code will signal SIGSEGV?
I hope this helps . Because the size of double rainRate[6]; is 6, but your code tries to access 7 items: [0],[1],[2],[3],[4],[5],[6].If you have an array of n elements, valid indexes are 0-n-1. 0-5 in your case.
TAG : cpp
Date : October 29 2020, 04:46 AM , By : Nicole Shindel
How to get substring from wstring in c++?
How to get substring from wstring in c++?
hope this fix your issue How to get substring from a wstring?
TAG : cpp
Date : October 29 2020, 04:46 AM , By : elic_CS
Using auto in output parameter
Using auto in output parameter
should help you out It looks like you are wanting to default-initialize an object of the type a given function expects as an argument.You can't do this with auto, but you could write a trait to extract the type a function expects, then use that to de
TAG : cpp
Date : October 29 2020, 04:46 AM , By : SNickerson
Operator overloader not making an affect
Operator overloader not making an affect
I wish did fix the issue. Your operator< is meaningless. The only thing it can do is comparing MinPQ object with T object. If you want to compare two T objects you should do this:1) If the template type T can take only a handful of types, you can wri
TAG : cpp
Date : October 29 2020, 04:46 AM , By : Shasi Edwin
Why does my code crash?
Why does my code crash?
wish help you to fix your issue Your question is too broad, and there is no general answer. In general, the bug is yours (don't suspect at first the compiler or the implementation to be wrong, almost always you are wrong, not the system!).First, read
TAG : cpp
Date : October 29 2020, 04:46 AM , By : Yashwanth Vadlamani
C++ Van loading program
C++ Van loading program
it helps some times I am stuck. , Try rewriting
TAG : cpp
Date : October 29 2020, 04:46 AM , By : Alexandr Fletch
Begin of output container default value in a function
Begin of output container default value in a function
I hope this helps . The most obvious solution to use the default constructed iterator as the default value.
TAG : cpp
Date : October 29 2020, 04:45 AM , By : MANAV SHARMA
Definition of variable inside loop
Definition of variable inside loop
Hope that helps The difference is in terms of scope of the variable.In the first case, once the while loop ends, the variable k cannot be accessed.
TAG : cpp
Date : October 29 2020, 04:45 AM , By : Nathan Wood
CreateProcess waits when exe file is invalid
CreateProcess waits when exe file is invalid
I wish this help you You need to change the error handling policy for your process, by calling SetErrorMode. You should do this at the very beginning of your program, during startup.
TAG : cpp
Date : October 29 2020, 04:45 AM , By : Sergey Simonov
Saving values in QLineEdit
Saving values in QLineEdit
seems to work fine Can I save values in QLineEdit widgets, so when I open an app, values which I entered were there?
TAG : cpp
Date : October 29 2020, 04:45 AM , By : Sai Miyoshi

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