Recent questions tagged C++

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c++ - Eclipse failed to execute MI command -target-select remote

Trying to setup remote gdb debugging in eclipse. When I try to debug I get: Error in final launch sequence Failed ... what I am doing wrong ? See Question&Answers more detail:os...

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

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201 views

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c++ - Are there cases where downcasting an actual Base to a Derived would be defined?

In the general case, it is (a very well deserved) Undefined Behavior to dowcast from a (dynamic) Base to one ... if working with other casts ! 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 are double and long double completely the same on my 64 bit machine?

This question may sound like for beginners, however when I found that out I thought I'm either a beginner or ... MSVC 2010 on 64bit machine. 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++ - Difference between "return-by-rvalue-ref" & "return-by-value" when you return using std::move?

Considering the following code: #include <iostream> using namespace std; struct I { I(I&& rv) { cout << "I: ... is not covered in this example? See Question&Answers more detail:os...

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

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236 views

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c++ - Is there a (Linux) g++ equivalent to the /fp:precise and /fp:fast flags used in Visual Studio?

Background: Many years ago, I inherited a codebase that was using the Visual Studio (VC++) flag '/fp:fast' to ... results as the VC++ version. 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++ - How to use CMake with Catch2?

From Catch2's example, I tried to run this example with cmake where structure of my project is like ... PRIVATE ${CMAKE_SOURCE_DIR}/include) See Question&Answers more detail:os...

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

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293 views

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c++ - Current status of std::make_array

What is the current status of std::make_array function proposed here? I cannot find any information about its ... C++17 Standard draft. 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++ - std::decimal::decimal64 correct usage, g++ 4.6.3

I'm investigating the replacing of doubles in our code with g++'s std::decimal::decimal32/64/128 types for ... things off (pardon the pun) 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++ - How to determine the end of an integer array when manipulating with integer pointer?

Here is the code: int myInt[] ={ 1, 2, 3, 4, 5 }; int *myIntPtr = &myInt[0]; while( *myIntPtr ... we could have avoided this problem. What say? 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++ - Do we have auto array in c++17?

Consider the following code: auto numbers = {1, 2, 3, 4}; // 'numbers' is an std::intializer_list<int> ... ' Why is this limitation in place? See Question&Answers more detail:os...

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

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213 views

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c++ - How to bind program termination with end-of-stream in Boost.Process 0.5?

In this simple example of Boost.Process 0.5 ( http://www.highscore.de/boost/process0.5/index.html) the output of ... ::endl; // never reach } See Question&Answers more detail:os...

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

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355 views

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c++ - Visual Studio 2012: Syntax Highlighting is turning off and on

I'm using VS2012 and I'm quite happy with it. But the problem is, whem I'm coding in C++, that the syntax ... . Does anyone know how to fix 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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421 views

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c++ - Uniquely identify PC based on software/hardware

For a requirement to generate per-PC license keys, I need some code which will return a stable and (near) ... quite look like what I want? See Question&Answers more detail:os...

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

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322 views

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c++ - Unary minus and signed-to-unsigned conversion

Is this always technically correct: unsigned abs(int n) { if (n >= 0) { return n; } else { return - ... expression -l at risk of overflowing? See Question&Answers more detail:os...

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

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256 views

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c++ - Does it make sense to catch exceptions in the main(...)?

I found some code in a project which looks like that : int main(int argc, char *argv[]) { // some stuff ... that we are swallowing it here... 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++ - Strange behaviour of ldr [pc, #value]

I was debugging some c++ code (WinCE 6 on ARM platform), and i find some behavior strange: 4277220C ... just familiarizing with the assemblies. See Question&Answers more detail:os...

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

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620 views

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c++ - Why am I getting "vector iterators incompatible"?

Why does this code #include <algorithm> #include <iterator> #include <vector> int main() { std::vector<int> v ... (Visual C++ 2008)? See Question&Answers more detail:os...

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

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304 views

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c++ - Using std:vector as low level buffer

The usage here is the same as Using read() directly into a C++ std:vector, but with an acount of ... to critical reviews and other answers. See Question&Answers more detail:os...

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

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260 views

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c++ - About shared_ptr and pointer to member operator `->*` and `std::bind`

Recently I discovered that shared_ptr does not have pointer to member operator ->*. I created simple example: ... replacement for operator->*? See Question&Answers more detail:os...

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

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227 views

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c++ - what's the difference between list.sort and std::sort?

I am trying to compile the following code using clang but got the following error. I am wondering why using sort from the ... () - __x.base(); } See Question&Answers more detail:os...

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

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510 views

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c++ - Detect when a Module (DLL) is unloaded

Is there a way to progammatically detect when a module - specifically a DLL - has been unloaded from a process? ... a detour existed within 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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487 views

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c++ Mixing printf with wprintf (or cout with wcout)

I know you should not mix printing with printf,cout and wprintf,wcout, but have a hard time finding a good answer ... how to figure it out :-( See Question&Answers more detail:os...

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

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359 views

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c++ - Demangling in MSVC

How can i demangle name in MSVC? There's abi::__cxa_demangle function in gcc. In MSDN i've found ... header file it is defined? See Question&Answers more detail:os...

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

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336 views

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c++ - Visual Studio 2013 doesn't ignore disabled warnings

Good morning all. So I'm attempting to disable Warning 4996 in our c++ projects. It seems to be included in the ... in a future version of MFC. See Question&Answers more detail:os...

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

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250 views

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c++ - Possible ambiguity with extern "C", overloading, and function pointers

With normal functions, one can write extern "C" int Frotz(int); // in a header int Frotz(int x) { return x; ... going to break a ton of code." See Question&Answers more detail:os...

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

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850 views

1 answer

c++ - How can I use a QFutureWatcher with QtConcurrent::run() without a race condition

If I understand the following code from the QFutureWatcher documentation correctly, then there is a race condition ... work around this bug? See Question&Answers more detail:os...

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

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224 views

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c++ - Friend function is not visible in the class

I have the following code: struct M { friend void f() {} M() { f(); // error: 'f' was not declared in ... the same bug. So, what did I miss? See Question&Answers more detail:os...

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

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309 views

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c++ - cygwin g++ Linker doesn't find shared library

I have been creating a library. When I compile it as a static library, it works fine. Now I want to turn it into ... $*.d -c $< $(INCLUDE_PATHS) See Question&Answers more detail:os...

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

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