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How to allocate memory sequentially or at the indicated addresses?
I wish did fix the issue. Without specifying a start address for where to map the memory, the kernel will use some heuristics to determine the best place. Leaving some gap is part of that.The usual way to allocate consecutive blocks of address space,
TAG :cpp
Date : September 23 2020, 08:00 PM , By : Aafloey
get know whether 'this' or other arguments are rvalue
I think the issue was by ths following , Suppose we have class Base and its member function Base doSomething(const Base other). I would like to know how to determine whether this or other object is rvalue, for example I need something like , You can
TAG :cpp
Date : September 23 2020, 08:00 PM , By : Ian Pratt
Solution for a problem using vectors in c++ shows when submitted but runs fine when the same input is run using custom
like below fixes the issue Recently I was solving this problem on interviewbit.com - https://www.interviewbit.com/problems/merge-intervals/.
TAG :cpp
Date : September 23 2020, 08:00 PM , By : Queue
UDP server fails to send reply back and sendto returns -1 and errno is 22
Hope that helps Error 22 is EINVAL, which means you pass an invalid argument.The invalid argument in this case could be the uninitialized len argument: You need to initialize it to sizeof cliaddr before you call recvfrom.
TAG :cpp
Date : September 23 2020, 07:00 PM , By : Caesar
Block movement between rectangles c++ (collison done)
This might help you I'm guessing the first thing to do would be to rewind your moving box's movement so that it doesn't collide anymore with your fixed box. Right now your boxes are probably staying in a colliding state, hence the infinite loop.Then
TAG :cpp
Date : September 23 2020, 07:00 PM , By : veer
How to create my own loop version in C++?
will help you In addition to the proposals in other answers, you could create a function like the one below, but it is, at the very end, very similar to using the standard std::for_each.
TAG :cpp
Date : September 23 2020, 07:00 PM , By : Hoosy
How to implement what I call a "wraparound sort" around an arbitrary value in C++?
it fixes the issue You can do this combining std::partition and std::sort. std::partition will split the vector around the partition point and then you can use std::sort to sort both halves. That would look like
TAG :cpp
Date : September 23 2020, 06:00 PM , By : Jed
Templated class operator+ overloading return type
wish help you to fix your issue I am trying to built a templated num class. This class needs to have a public attribute, val, with type T, which is the only templated parameter. Furthermore if one provides a value the attribute (val) should be initia
TAG :cpp
Date : September 23 2020, 06:00 PM , By : user6088100
tbb:concurrent_unordered_map() - ID for each unique element in a vector?
I wish this helpful for you There is a data race between the check and the assignment. If there is barrier or another synchronization between assignment of the IDs and their first usage (like in the OP's example), the race can be ignored assuming hol
TAG :cpp
Date : September 23 2020, 06:00 PM , By : Gupron Hamidi
Move semantics construction failure when variable and parameter names match
I think the issue was by ths following , The parameter shadows the member variable. That's expected behavior. You can fix it with:
TAG :cpp
Date : September 23 2020, 06:00 PM , By : msingh
Comparing nullptr QVariant against empty QString gives different output in Qt5.9 and Qt5.12
With these it helps Comparing QVariant's can be tricky, especially if their meta-types differ, because a conversion between them is always attempted. In your latter case comparison returns true because Qt 5.12 supports conversion of a QMetaType::Null
TAG :cpp
Date : September 23 2020, 05:00 PM , By : Abdi Uttoo
C Program Result Explanation
it helps some times square(3+2) expands into 3+2*3+2, which evaluates as 3 + (2 * 3) + 2.define square(x) ((x) * (x)) should do what you want.
TAG :cpp
Date : September 23 2020, 05:00 PM , By : user6088190
Strcmp not working, even when comparing the same character
wish helps you You're using the wrong set of quotes.The strcmp function expects both arguments to be of type const char *, i.e. a pointer to a null terminated string. In C++ (and C) single quotes are used for single characters, while double quotes ar
TAG :cpp
Date : September 23 2020, 05:00 PM , By : cyril barcelo
C++ Matrix Operator+
this one helps. Firstly, there is way too much code here.To address your problem, I see don't see you allocating memory to lhs.m_. This is a problem because you initialize lhs with the default constructor, which only assigns this->m_ to a nullptr.
TAG :cpp
Date : September 23 2020, 05:00 PM , By : Atlas
WEBOTS - Write controller data to external CSV file
wish helps you There is no printf or std::cout in the code you provided. If you're just looking for a way to create CSV files then here's a sample for how I create CSV files using std::fstream, it's fairly similar to how you'd use std::cout except th
TAG :cpp
Date : September 23 2020, 04:00 PM , By : Антон М.
How is using -pthread not violation ODR rules?
I wish did fix the issue. On Linux, the flag -pthread as opposed to -lpthread indeed only additionally passes the flag -D_REENTRANT to the gcc options, which is obsolete nowadays.See also this comment in features.h:
TAG :cpp
Date : September 23 2020, 04:00 PM , By : Edd
floating point number comparison why no equal functions
I hope this helps you . The interest of isgreater, isless, isgreaterequal, islessequal compared to >, = and
TAG :cpp
Date : September 23 2020, 04:00 PM , By : Victor Pongnian
VS2019 C++ unknown override specifier
I wish this helpful for you struct Name has not yet been defined when you attempt to make use of it. Define struct Name before you define struct Person.
TAG :cpp
Date : September 23 2020, 04:00 PM , By : AnshulR
compiler determine argument is given or omitted
I think the issue was by ths following , No, there's no way to know (even at run-time) the argument was specified or not for parameter with default argument in the function.You can apply overloading, e.g.
TAG :cpp
Date : September 23 2020, 04:00 PM , By : Xefunix
String constructor with a int is not printed
I wish did fix the issue. , In the both cases
TAG :cpp
Date : September 23 2020, 03:00 PM , By : Gustavo Flores
Smarter include guard in C++ to include headers several times inside different namespaces
this one helps. A decent solution would be to have a version of the header without guards:
TAG :cpp
Date : September 23 2020, 03:00 PM , By : Avijeet
Why there is so much difference between these methods of creating string
Hope this helps The length of the string will have a major effect on specific results, along with things like any small string optimisation. For example it might force a "byte by byte copy" even for a "move", while avoiding the cost of any memory all
TAG :cpp
Date : September 23 2020, 02:00 PM , By : ak1611
why I am getting error while taking input for variable b.(8th line)
This might help you Assuming "Testcase 39915186055525904358 90102 63169402" is the input that fails, you got the following scenario:
TAG :cpp
Date : September 23 2020, 02:00 PM , By : Юсиф Гусейн-заде
How to use alternative types of std::variant polymorphically
I wish this help you Assuming every type in the variant has some field std::string_view token; (whether this is written out in each one or comes from a common, not necessarily polymorphic, base class is up to you), you could write accessors like the
TAG :cpp
Date : September 23 2020, 02:00 PM , By : Ajay Tv
Is there a way with C++ and visual studio debugging to always throw an exception when going outside of the bounds of an
Any of those help Depending on what you use, there's a few possibilities. Obviously, the answer is: Don't go out of bounds. But how? Well you can always check the length before doing access, to be sure your index is inside the boundaries of the array
TAG :cpp
Date : September 23 2020, 01:00 PM , By : bernas
Problem with combining lines form file with custom text in cout
fixed the issue. Will look into that further Let me take a guess here. Your file was created or edited on Windows, but you're not using Windows to build/run your code. So instead of newline characters at the end of each line (\n) you have newlines an
TAG :cpp
Date : September 23 2020, 12:00 PM , By : kschan
Would writing indexes in a suitable situation be better than a for-loop performance-wise in c++?
I wish did fix the issue. It's a very good thing that you're thinking of ways to make your code better and faster after already getting it working. I applaud you for that--it's something I wish some of my coworkers did more often :pHowever, there is
TAG :cpp
Date : September 23 2020, 12:00 PM , By : kults7
Name Instances of Class Member Template Function
I wish did fix the issue. You can't alias member functions directly. But you can write wrappers that forward to them:
TAG :cpp
Date : September 23 2020, 11:00 AM , By : veerendranadh ravuri
How to wrap OpenCV C++ function in C code
fixed the issue. Will look into that further To wrap C++ code so that it's callable by C can be done with a few C++ functions that present themselves as C funcs. As an example, Let's imagine I have a class called MyObj....
TAG :cpp
Date : September 23 2020, 11:00 AM , By : KK Netcials
can cv::convexHull be applied to double-precision points data
Hope this helps convexHull works only with Point2i (same as Point) and Point2f. See the code for reference:
TAG :cpp
Date : September 23 2020, 10:00 AM , By : syul
set_difference not always returns the right answer
like below fixes the issue You violate the preconditions of std::set_union and std::set_difference:
TAG :cpp
Date : September 23 2020, 10:00 AM , By : agoodman42
Why do equal expressions in 'class' and 'main' behave differently?
it should still fix some issue An informal answer if I may. The two statements are very different beasts. The first one is a member variable declaration with an attempt at initialisation.The second is the declaration of a variable with automatic stor
TAG :cpp
Date : September 23 2020, 10:00 AM , By : user6088644
What is the correct way of constructing multiple threads to get best performance?
hop of those help? There will be very little difference in overhead between passing the address of a member function and a set of parameters to the std::thread constructor vs passing a lambda function with appropriate captures.The big overhead in the
TAG :cpp
Date : September 23 2020, 10:00 AM , By : Arjun.Mahadik
Why's wrong with this template? how can I compile it correctly
I hope this helps you . , Your destructor as written:
TAG :cpp
Date : September 23 2020, 09:00 AM , By : imgreg
Initialization of struct pointer containing a struct pointer of same type
I hope this helps you . I am trying to understand how the initialization of a pointer to a struct object (which contains a pointer to a struct of the same type) occurs. e.g I have a struct: , Lets take the basic premises, but with a valid example ins
TAG :cpp
Date : September 23 2020, 09:00 AM , By : Suguna
Rcpp: calling c++ function in R without exporting c++ function
I wish this helpful for you I think you're probably mixing up the concept of exporting C++ code to be used in R (via // [[Rcpp::export]]), which is entirely different to exporting R functions from your package, i.e. making those functions available t
TAG :cpp
Date : September 23 2020, 09:00 AM , By : Nicola
C/C++ Can "for loop" be used in a marco instead of "do while"?
Does that help Are the two below constructions equivalent in assumption that "cond" is not conflicting with any name in the program , You can do it like this:
TAG :cpp
Date : September 23 2020, 09:00 AM , By : Max Uki
I am creating a calculator in c++ which it has an undo and clear. Using stacks
this will help If you're looking to implement a calculator, use the Shunting Yard algo. This algorithm works in the same manner as swapping a position in two arrays with the exception that instead of using a single cell as temporary storage, it utili
TAG :cpp
Date : September 23 2020, 07:00 AM , By : शैलेश्
How does the input operator (>>) know where to stop and take the next input if the inputs are seperated by single
I wish this helpful for you (>>) is an extraction operator. It can be used more than once to accept multiple inputs. It differentiates the multiple inputs through spaces or the next line. In your case, there is a space between 5 and 6 so the extracti
TAG :cpp
Date : September 23 2020, 06:00 AM , By : NoobieCoder
Memory leak by local pointer inside C++ constructor body
I wish this help you Hi have a code very similar to this , Here's how you do it. When you don't need ptr anymore, delete it:
TAG :cpp
Date : September 23 2020, 05:00 AM , By : Wei Zhou
Different results in floating-point calculations on WebGL2 and C++
it helps some times OpenGL ES 3.0 on which WebGL2 is based does not require floating point on the GPU to work the same as it does in C++From the spec
TAG :cpp
Date : September 23 2020, 05:00 AM , By : Remy Farulli
Static member function and access operator
should help you out I was just looking through lvalue(Value categories) from cppreference.com and came across member access operator that specifies as : , This is the simplified example from cppreference
TAG :cpp
Date : September 23 2020, 04:00 AM , By : Steve
How do i handle this situation C++ sizeof problem
seems to work fine If I have understood correctly you are trying to get the size of the passed array in the function.Do it the following way
TAG :cpp
Date : September 23 2020, 04:00 AM , By : TalZ
Destructors for automatic storage
wish helps you Objects that have destructors will have them called when the life-time of the objects ends.Objects that doesn't have destructors (like e.g. variables of primitive types like int or float) will still end their life-time, but there's no
TAG :cpp
Date : September 23 2020, 04:00 AM , By : Alex
How to initialize an std::array in the initializer list of a class without hardcoding the array's size
I think the issue was by ths following , I've got Foo.h: , Use a helper function. Add
TAG :cpp
Date : September 23 2020, 03:00 AM , By : Ramaben Vasani
Inheriting traits in c++
I think the issue was by ths following , I am creating a trait in c++ which takes as template input another trait I made. However, when I run this code I get the following compiler error : , Not sure what this is supposed to mean:
TAG :cpp
Date : September 23 2020, 03:00 AM , By : Howard Yu
Constexpr if testing one template parameter
I wish did fix the issue. You're too focused on new language features instead of old techniques. If you want a template function that only works if the type given is any instance of MyTemplateClass which takes as its first parameter char, then write
TAG :cpp
Date : September 23 2020, 03:00 AM , By : Wilco van der Mersch
Static constexpr global variable
To fix the issue you can do There is no difference, the constexpr specifier on a variable of object type implies const [dcl.constexpr]/9:
TAG :cpp
Date : September 23 2020, 03:00 AM , By : Alexey Golovko
How to run 3 functions at once?
wish help you to fix your issue I have one project called "everything" and 3 source files inside, "glow", "radar", "trigger". Inside, each one of these has a function(int glow {code}, int radar {code}, int trigger {code}). I am aware I need a main fu
TAG :cpp
Date : September 23 2020, 03:00 AM , By : safura patel
Separate class ownership and use, generate optimal (fast) code
I think the issue was by ths following , Your CPU is smarter than you think. Modern CPUs are absolutely capable of guessing the target of, and speculatively executing through, an indirect branch. The speed of the L1 cache, and register renaming, ofte
TAG :cpp
Date : September 23 2020, 03:00 AM , By : Appeliotus
C++ Convert Hex String Representation to Hex
fixed the issue. Will look into that further A simple (and slightly naive) way is to get two characters at a time from the input string, put in another string that you then pass to std::stoi (or std::strtoul if you don't have std::stoi) to convert to
TAG :cpp
Date : September 23 2020, 03:00 AM , By : German Gluhhov
Round double to nearest non subnormal representation
help you fix your problem All subnormal double magnitudes are between 0 and DBL_MIN. If a value is less than DBL_MIN, just round it to one of those, based on comparing it to DBL_MIN/2. (To match usual IEEE-754 rounding behavior, DBL_MIN/2 itself shou
TAG :cpp
Date : September 23 2020, 02:00 AM , By : studio programmatori
In what scopes is the "using namespace" clause valid?
With these it helps From cppreference.com:
TAG :cpp
Date : September 23 2020, 01:00 AM , By : 谢汉杰
Check template type in struct
help you fix your problem This is a use case for template specialization. You have a primary template like
TAG :cpp
Date : September 23 2020, 01:00 AM , By : Thangaraj J
How to avoid creating any object within the storage that a const automatic object used to occupy?
will be helpful for those in need the user needs to be avoid creating any object in any memory location that might have been used by the stack (to store automatic objects)
TAG :cpp
Date : September 23 2020, 12:00 AM , By : Mohamed Wessim
When is a memory_order_seq_cst fence useful?
hop of those help? No, a seq-cst-fence is not only both a release and an acquire-fence, but also provides some additional properties (see Working Draft, Standard for Programming Language C++, 32.4.4-32.4.8). A seq-cst fence is also part of the single
TAG :cpp
Date : September 23 2020, 12:00 AM , By : بحبك انت بس
C++ "Using Uninitialized Memory.. (variable name) "
wish help you to fix your issue This program reads the lines from the text file "penguins.txt" and copies the data into the "FeedingOutput.dat". It worked fine on a different PC but when I run it on my laptop I get the following errors: , Given
TAG :cpp
Date : September 23 2020, 12:00 AM , By : Rafiq Raja
Set behave unexpectedly: local, or not local?
should help you out The parameter S of func() is passed by value, it's copied from the argument, any modification on it inside func() has nothing to do with the argument (i.e. S in test()).You should make it pass-by-reference. Then given func(n, S);
TAG :cpp
Date : September 23 2020, 12:00 AM , By : Yash Kakkar
Converting all to uppercase
it helps some times Don't write C-like C++, use the standard library to your advantage. Use an std::string and do something like this instead:
TAG :cpp
Date : September 23 2020, 12:00 AM , By : sadscv
CMake toolchain file: Appropriate value of `CMAKE_SYSTEM_PROCESSOR` for embedded development
I wish this help you Your assumption is wrong. All arm processors are different.Just as an example here are some hardware options an arm core could have:
TAG :cpp
Date : September 23 2020, 12:00 AM , By : jim.xu

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