Recent questions tagged C++

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c++ - Compiler Error: Function call with parameters that may be unsafe

Got some code that is not mine and its producing this warning atm: iehtmlwin.cpp(264) : warning C4996: 'std:: ... >, allocator<char> > string; 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++ - Should a warning or perhaps even an assertion failure be produced if delete is used to free memory obtained using malloc()?

In C++ using delete to free memory obtained with malloc() doesn't necessarily cause a program to blow up. Should ... have this feature on C++? 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++ - Are destructors overloadable?

enable_if doc page says: Constructors and destructors do not have a return type; an extra argument is the ... . Are destructors overloadable? 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 does scope resolution fail in presence of decltype?

It is my understanding that decltype is used to query the type of an objects/variables and so on. From the ... MSVC2012 (without the Nov CTP) 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++ - Does std::map require the comparator's operator() to be const?

The following code fails to compile with XCode 4.5's clang++ when using libc++ on OS X 10.8: #include <map ... libstdc++ is a happy accident). 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++ - Are std::signal and std::raise thread-safe?

The C and C++ standards support the concept of signal. However, the C11 standard says that the function signal() cannot ... thread(f).join(); } 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 does this need an explicit std::move?

Let's say I got a Foo class containing an std::vector constructed from std::unique_ptr objects of another class, Bar ... So, what am I missing? 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++ - strcpy_s not working with gcc

I have a C++11 project, and I added some strcpy_s method calls. This works on windows, but when compiling on gcc, ... to the code, to no avail. 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++ - What about the types int2, int3, float2, float3 etc

I've seen different code snippets using these types, but I haven't seen if they are defined in some <standard ... operator+, operator-, etc.). 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 call Base class method through base class pointer pointing to derived class

class Base { public: virtual void foo() {} }; class Derived: public Base { public: virtual void foo() {} ... through casting or something? */ } 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++ - C++11 regex: digit after capturing group in replacement string

My regex_replace expression uses group $1 right before a '0' character in the replacement string like so: ... in the substitution string? See Question&Answers more detail:os...

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

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991 views

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c++ - Convert ifstream to istream

How would one go about casting a ifstream into a istream. I figure since ifstream is a child of istream I should be ... = inputFile; ..... } 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++ - unexpected copies with foreach over a map

I am trying to loop over the entries of a map, and I get unexpected copies. Here is the program: #include <iostream ... } What's going on 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++ - Windows GUI + Console Output, Linux-style

I have a GUI application, which I am developing cross-platform for Linux and Windows. On Linux, everything ... if none was originally used. 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 string literal and constexpr array of char

I have been wondering if there is any difference between what is being pointed by ptrToArray and ptrToLiteral in the ... else to know about? See Question&Answers more detail:os...

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

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395 views

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c++ - std::enable_shared_from_this; public vs private

I was playing around for a bit using the shared_ptr's and enable_shared_from_this, while I run into something I ... I miss something again?) 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++ - Mixing operator new[] and placement new with ordinary delete[]

Just out of curiosity, is the following legal? X* p = static_cast<X*>(operator new[](3 * sizeof(X))); new(p + ... ->~X(); operator delete[](q); See Question&Answers more detail:os...

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

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688 views

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c++ - Qt Set Background Color of QLineEdit

I'm trying to change the background color of the QLineEdit and I can't figure it out at all. I tried using ... is there another way to 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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726 views

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c++ - Proper initialization of static constexpr array in class template?

Static class members in C++ have caused a little confusion for me due to the standard's verbiage: 9.4 ... template definition outside of class)? See Question&Answers more detail:os...

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

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212 views

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c++ - Why compilers no longer optimize this UB with strict aliasing

One of the first results for strict aliasing on google is this article http://dbp-consulting.com/tutorials/ ... does not optimize 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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627 views

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c++ - std::map access operator deprecated? no operator [] matches these operands

According to http://www.cplusplus.com/reference/map/map/, I can use either m[k] or m.at(k) to access ... you have any insight into this issue? See Question&Answers more detail:os...

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

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522 views

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c++ - Repeating Q_DISABLE_COPY in QObject derived classes

In Qt there is a macro that allows declaring private copy constructurs and assignment operators for classes: http ... classes from being copied? See Question&Answers more detail:os...

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

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296 views

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c++ - Why is move constructor not picked when returning a local object of type derived from the function's return type?

The following code is rejected by both Clang and GCC (trunk versions): #include <memory> struct Base { Base( ... misleading wording worth a DR? 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++ - What is the deal with undefined symbols in a shared library or dylib?

I have a Makefile for linux that I am porting over to Darwin. The makefile takes a bunch of .o files ... how this can work ultimately. 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 split a vector into n "almost equal" parts

I have a problem that I would like to merge a large number of images using ImageMagick's convert.exe, but under ... then it's perfect for me. See Question&Answers more detail:os...

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

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634 views

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c++ - Is NULL defined as nullptr in C++11?

Will C++11 implementations define NULLas nullptr? Would this be prescribed by the new C++ standard? See Question&Answers more detail:os...

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

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1.7k views

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c++ - Safely convert std::string_view to int (like stoi or atoi)

Is there a safe standard way to convert std::string_view to int? Since C++11 std::string lets us use stoi to ... ; // Does not get called } See Question&Answers more detail:os...

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

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315 views

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c++ - Is it wise to access read-only data from multiple threads simultaneously?

I have an application that I'm trying to make multithreaded. Each thread will access a large chunk of read- ... if that makes any difference. See Question&Answers more detail:os...

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

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