Recent questions tagged C++

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c++ - boost::spirit::x3 attribute compatibility rules, intuition or code?

Is there a document somewhere which describes how various spirit::x3 rule definition operations affect attribute compatibility? ... 't find it. 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++ - Eigen::Ref for concatenating matrices

If I want to concatenate two matrices A and B, I would do using Eigen::MatrixXd; const MatrixXd A(n, p ... Eigen::Ref<MatrixXd> instead? 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++ - Clang template incomplete type

I have the following code that compiles fine under in Visual Studio and g++ but in Clang I get the error " ... work around the issue in Clang? 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++ - efficiently acquiring a screenshot of the windows desktop

Is there a more efficient way of getting a copy of the windows desktop ( using GDI or any other library ) ... (BITMAP), (LPSTR)&bmpDesktopCopy); 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 Virtual Memory Address is the same in different process?

I know the virtual memory separates 2G(for kernel)/2G(for user) in Windows. But why the address of ... sandbox mechanism in user process? 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++ - Usefulness of the "inline" feature

There's two things about inlining: The inline keyword will be ignored if the compiler determines that the ... inlining would be preferred? 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++ - Showing JPG image with Qt does not work with release executable

i have a annoying issue with showing jpg images with qt. I devlope with Visual Studio 2008 in Windows 7 and ... the problem might be. 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++ - return list of values between parenthesis (10, 20, 30, 40)?

I am working in C++ (not C++/CLI) in Visual Studio 2012. I don't understand why this code works, I ... this syntax means and why it works? 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++ - One definition rule and different class definitions in two translation units

There is this code: file a.hpp: class A; file a.cpp: #include "a.hpp" struct A { int x = 777; int y; ... of class A is different in both files? 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++ - Procedural generation of stars with skybox

I am attempting to procedurally generate a star-filled background in OpenGL. The approach I am taking is to ... ); glDepthFunc(GL_LESS); } 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++ - Move semantics & returning const values

I have the habit (?!?!?) of returning everything as a "const" value. Like this... struct s; s const ... can't we move "const" temporaries? 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++ - Start a GUI process in Mac OS X without dock icon

I have an application that normally runs with a standard graphical interface. However, for certain long-running ... threads.) Any solutions? 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++ - Understanding eliding rules with regard to c++11

I have been testing with rvalue references and move semantics and want to make sure I understand when a copy ... effect my design of classes. 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++ - utfcpp and Win32 wide API

Is it good/safe/possible to use the tiny utfcpp library for converting everything I get back from the wide Windows API ... failed." ); } } 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 gcc warns about narrowing conversion only for uniform initialization?

I am trying to convert long type variable to int type variable with uniform initialization and without it. But I get ... int i2 = { l }; 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++ - Function pointer to class member function problems

First of all I have to admit that my programming skills are pretty limited and I took over a (really small) ... the right way to do this. 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++ - combinations algorithm

I want to make simple sorting algorithm. given the input "abcde", I would like the output below. could you tell me the ... ] = "bcde" ... ... 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++ - map iterator in template function unrecognized by compiler

I have the following code. template<class key,class val> bool has_key(key chkey,std::map<key,val> map){ for ( ... Sam Hain is going on here?! 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++ - boost::spirit::qi keywords and identifiers

I've seen a few posts related to the nuances of keyword/identifier use in qi grammars, but I can't quite ... exact matches to keywords? 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++ - Use an Anonymous Stringstream to Construct a String

I want to read directly into a string with code like this: std::string myString(( std::ostringstream() ... this with an anonymous stringstream? See Question&Answers more detail:os...

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

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285 views

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c++ - Unsigned long with negative value

Please see the simple code below: #include <iostream> #include <stdlib.h> using namespace std; ... 9223372036854775808 0 -9223372036854775808 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 the free() function not return memory to the operating system?

When I use the top terminal program at Linux, I can't see the result of free. My expectation is: free map ... printf("endend "); Thanks 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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c++ - _O_WTEXT, _O_U16TEXT, _O_U8TEXT - are these modes possible in mingw compiler, are there any workarounds?

#include <fcntl.h> #include <io.h> #include <stdio.h> int main(void) { _setmode(_fileno(stdout), ... show-stopper with this compiler ? 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++ - Windows XP and Windows Server 2003 support in Visual Studio 2013

How about Windows XP and Windows Server 2003 support in Visual Studio 2013? Can i write programs in C++ for these systems in Visual Studio 2013? 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++ - Scaling byte pixel values (y=ax+b) with SSE2 (as floats)?

I want to calculate y = ax + b, where x and y is a pixel value [i.e, byte with value range is 0~255] ... I convert the data from byte to float? See Question&Answers more detail:os...

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

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241 views

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c++ incorrect floating point arithmetic

For the following program: #include <iostream> #include <iomanip> using namespace std; int main() { for (float a ... or wrong in my example? 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++ - dynamic_cast of "this" inside constructor

This question is very similar to this one Why can't I dynamic_cast "sideways" during multiple inheritence?, except ... me? Thanks, Cam Bamber. See Question&Answers more detail:os...

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

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301 views

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c++ - Catching signals such as SIGSEGV and SIGFPE in multithreaded program

I am trying to write a multithreaded logging system for a program running on linux. Calls to the logging system in ... and how to catch them. See Question&Answers more detail:os...

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

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