Recent questions tagged C++

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c++ - How to deal with excess precision in floating-point computations?

In my numerical simulation I have code similar to the following snippet double x; do { x = /* some ... documentation of my library functions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Win32 named pipes and remote clients

Can I access a named pipe on computer A from computer B given computer A's IP address? If so, what do I need to do to make this happen? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Does an abstract classes have a VTABLE?

Do we have virtual table for an abstract class? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Purpose of perfect forwarding for Callable argument in invocation expression?

In Scott Meyer's book Effective Modern C++ on page 167 (of the print version), he gives the following example: ... and record elapsed time; }; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Compiler does not deduce template parameters (map std::vector -> std::vector)

I have the following template. template<typename T, typename U> std::vector<U> map(const std:: ... function that returns transformed container See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Sequence Points between printf function args; does the sequence point between conversions matter?

I read here that there is a sequence point: After the action associated with input/output conversion format specifier. ... terms are both 12. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - C1083: Cannot open include file: math.h: No such file or directory

I have a bunch of these errors and am at a dead end. Found plenty of answers on google but unfortunately none ... a settings I shouldn't have See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why does std::find_if(first, last, p) not take predicate by reference?

I was looking at the various signatures for std::find_if on cppreference.com, and I noticed that the flavors ... get the most performance out? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Template specialization with float as non type

Section 4.3 of C++ Templates states 'Not being able to use floating-point literals (and simple constant floating- ... not be of class type? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can I use (boost) bind with a function template?

Is it possible to bind arguments to a function template with (boost) bind? // Define a template function ( ... all the argument types Ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - why typeid returns that int and const int are same types

if(typeid(int) == typeid(const int)) cout << "Same types"<< endl; PROGRAM OUTPUT: Same types am I missing ... ? these are not same types lol. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Rotating back points from a rotated image in OpenCV

I'm having troubles with rotation. What I want to do is this: Rotate an image Detect features on the rotated ... offset. Thank you for your help See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Include OpenSSL in a CMakeList.txt file

I have a question for people who work with CMakeList.txt in C++. I want to use Podofo project (a ... openssl Thanks by advance community !! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the rationale for renaming monotonic_clock to steady_clock in <chrono>?

Why did the committee rename monotonic_clock to steady_clock? Vendors are providing monotonic_clock for backwards compatibility ... the rename. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What does floating point error -1.#J mean?

Recently, sometimes (rarely) when we export data from our application, the export log contains float values that ... lists of float errors. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Visual Studio 2013 runs project twice

When I press the "Local Windows Debugger" button when working on any basic C++ project in Visual Studio 2013, ... the project: Test Project.zip See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - c++11 variadic programming, how to define a tower of vectors

How (if possible) can I use c++11 variadic programming to define a series of vector's in a function body, ... to read arrays of any dimensions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::map<>::insert using non-copyable objects and uniform initialization

Have a look at the following code: #include <utility> #include <map> // non-copyable but movable struct ... successfully moved into the map? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Do *non*-const references prolong the lives of temporaries?

Once upon a time, I assumed that code like this would fail: const MyClass& obj = MyClass(); obj.DoSomething( ... relevant part of the standard? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why does GCC or Clang not optimise reciprocal to 1 instruction when using fast-math

Does anyone know why GCC/Clang will not optimist function test1 in the below code sample to simply use just the ... : https://goo.gl/jXsqat See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ pow(2,1000) is normaly to big for double, but it's working. why?

the code: #iclude <math.h> int main(){ double somenumber = pow(2, 1000); printf("%lf ", somenumber); return ... for double. How it's working? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to execute a class member function in a separate thread using C++11 thread class?

I'm trying to use the C++11's std::thread class to run a member function of a class to execute in ... thread class. Could someone help me? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can g++ / minGW play nice with the Windows SDK? Is Visual Studio the only option?

Can g++ and minGW on Windows XP use the Windows SDK? Specifically, why does g++ fail to compile: #include < ... Studio or is there another way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Cross Platform Way to make a directory including subfolders?

Is there a way using the standard c or c++ library to make a directory, including the subfolders that may ... of the absolute path? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Creating OpenGL context without window

I'm trying to figure out what is the simplest way to create a windowless OpenGL program for offscreen ... for the offscreen rendering. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What’s the best way to delete boost::thread object right after its work is complete?

I create boost::thread object with a new operator and continue without waiting this thread to finish its ... waiting for thread termination? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can I use a grayscale image with the OpenGL glTexImage2D function?

I have a texture which has only 1 channel as it's a grayscale image. When I pass the pixels in to glTexImage2D, ... GL_RGBA? If so, what to? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Order of evaluation and undefined behaviour

Speaking in the context of the C++11 standard (which no longer has a concept of sequence points, as you ... be greatly appreciated. Thank you! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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