Recent questions tagged c++

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c++ - Stack/heap overflow when declaring a large array

I was trying to declare a 1024 by 1024 float array but a window just popped up saying project_name.exe ... using Microsoft Visual Studio 2010. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Fail to Read Through Shared Memory

I am trying to publish some random things over shared memory; and for some weird reason, the reader doesn't pick up what ... (Red Hat 7.2.1-1) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - compiler error saying invalid initialization of reference of type something& from expression of type something*

I have a function prototype like test(something &) and i am doing something *ss = new something(); and i ... not it ss represents a reference ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Standard way to find base address of struct from a member

struct Data { int a; std::string b; float c; }; std::string* allocateDataAndGetString() { Data* dataPtr( ... couldn't get it to work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Boost.Spirit X3 parser "no type named type in(...)"

I was toying with Boost.Spirit X3 calculator example when I encountered an error I couldn't get my head ... decipher what that error means. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Common confusions with serializing polymorphic types

I have seen many questions, tutorials, and documentation involving serializing derived classes, and I haven't been ... least on StackOverflow :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Alternative to missing method in last version of Boost asio library

Some years ago, I wrote a email client using Boost asio library. There are a abstract class ICON with four ... workaround to this missed method? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Partially specializing member-function implementations

I'm currently refactoring some code the explicitly specializes a member function of a class template with two template ... not seem to compile.. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why am I getting a vertical line on toolstrip?

I have two Windows Forms toolstrips that contain some controls on a form. However, for some strange reason, they ... help? Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - typeid result across different dll's

I have two dlls which both declare a templated type, let's call A. If the declaration of A is sufficiently ... name1==name2 ? thanks, rob See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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426 views

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c++ - boost::this_thread::interruption_point() doesn't throw boost::thread_interrupted& exception

I want to interrupt a thread using boost::thread interrupt(). I have the following code which doesn't throw ... 't throw the expected exception? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Cant get output result using cvCornerHarris()

I just want to try the openCV function -- cvCornerHarris. Here is my c++ code: //image file char ... use this function cvCornerHarris. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Arity of aggregate in logarithmic time

How to define arity of an aggregate in logarithmic (at least base two) compilation time (strictly speaking, in ... manner), then use bisection. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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404 views

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c++ - What is the name of CMake's default build target?

I have a custom target, and I want it to depend on the default target (the one that is built with make). ... write make && make test?... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - printf and custom class

I have my own class that represents a custom string class. I'm using VS2012RC. I have overloaded some operators of my ... : printf("%s ",str); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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418 views

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c++ create a random decimal between 0.1 and 10

How would I do this? This is my attempt of doing so: srand (time(NULL)); seed = ((double)rand()) / ((double) ... between 0 and some int x. [0,x] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Converting a string with a hexadecimal representation of a number to an actual numeric value

I have a string like this: "00c4" And I need to convert it to the numeric value that would be expressed by the ... : 0x00c4 How would I do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Loading a texture in sfml

I started to learn SFML, I want to create sprite to load an image from a file, so I just followed the ... load textures or fonts so far). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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597 views

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c++ - std::unique_ptr and custom deleters

Scott Meyer's Effective Modern C++ discusses the use of std::unique_ptr with custom deleter and states: ... stored for the lambda case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Eigen: type deduction in template specialization of base-class

I trying do write a C++ template-class which should be able to deal with "simple" types and with "Eigen: ... finally found its way to github See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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421 views

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c++ - Implementing abstract class members in a parent class

Is it possible to implement an abstract base class with members inherited from another parent class in C++? It ... complicates a lot of things. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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387 views

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c++ - order of evaluation of subexpressions in a Java expression

I have the following snippet of code: int x=2,y=3; if ( (y == x++) | (x < ++y) ) // ... right? So the above expression should always yield true. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is there any boost/stl container which supports the following operation?

I was looking for stl/boost container which can provide following functionality: Auto insert element in sorted order. ... solve this problem ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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341 views

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c++ - Initialization of member array of non-copyable, non-movable, explicitly constructed types

A library which I can't modify has a type akin to the following: class A { public: A () : A( ... solutions to the original problem though. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Class Template Argument Deduction in member variables

Expanded version here. We can create objects of class templates that have default template parameters without typing ... not elegant at all. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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404 views

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c++ - Unable to change values in a function

I'm starting with developing, sorry about this newbie question. I need to create a function that swap values between 2 vars. ... = x; x = z; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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758 views

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c++ - How to convert a string representing decimal number in exponential form to float in Qt?

I have some decimal numbers in a text file represented in exponential form Eg: 144.2e-3. I want to store the ... toFloat()" method. Please help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

1 answer

c++ - OpenCV / Tesseract: How to replace libpng, libtiff etc with GDI+ Bitmap (Load into cv::Mat via GDI+)

I'm working on a project that uses OpenCV and Tesseract. Both libraries are based on libpng, libtiff, libjpeg ... already made for that purpose? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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