Recent questions tagged c++

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c++ - Disable QDialogs default close button (upper left "cross button")?

Is it possible to disable/delete the QDialogs default close button at the upper left of the dialog? 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++ - STL internals: deque implementation

I am using a std::deque for storing a large collection of items. I know that deques is implemented as a ... algorithm for choosing that size. 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++ - template base class typedef members invisible

I'm aware of the fact that the 'dependent names' are not visible to the compiler by default. But I ... parent template class' member typedefs? 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++ friend function - operator overloading istream >>

My question is in regards to friend functions as well as overloading the << and >>. From my understanding I ... is; } Any thoughts? 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++ - What is the lifetime of a default argument temporary bound to a reference parameter?

I thought references only extend the lifetime of temporaries to the lifetime of the reference itself, but the output ... called... what gives? 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++ - if constexpr - why is discarded statement fully checked?

I was messing around with c++20 consteval in GCC 10 and wrote this code #include <optional> #include <tuple> ... optional. Now why is that? 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++ - Override template member in Interface

Is it possible to declare some type of base class with template methods which i can override in derived classes? ... i want to make sure. 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++ - Using Boost::odeint with Eigen::Matrix as state vector

I'm trying to utilize the ODE integration capabilities of Boost using the Matrix class from Eigen 3 as my ... doesn't support Eigen natively. 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 a better way to reverse an array of bytes in memory?

typedef unsigned char Byte; ... void ReverseBytes( void *start, int size ) { Byte *buffer = (Byte *)(start); ... , so I [hopefully] fixed 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++ - Undefined reference to _Unwind_Resume and __gxx_personality_v0

I'm trying to use the JsonCpp library. I'm on Windows, using MinGW and CodeBlocks. ... o ranlib buildsconsmingwsrclib_jsonlibjson_mingw_libmt.a See Question&Answers more detail:os...

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

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139 views

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c++ - Missing vc_runtimeminimum_x86.msi and installation won't work

I'm currently going through the installation process for Visual Studio 2017 Community Edition to use with C ... Fatal error during installation. 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 do you initialize (through initializer lists) a multidimensional std::array in C++11?

I am trying to initialize a 2D std::array trough initializer lists however the compiler tells me that there are ... Am I doing something 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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c++ - Invalid use of incomplete type struct, even with forward declaration

I'm aware of circular dependencies, but even with forward declarations I get this area. What am I doing ... of incomplete type struct Area See Question&Answers more detail:os...

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

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441 views

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c++ - Get function arity from template parameter

How can I get the arity of an arbitrary function type used as a template parameter? The function can be a normal ... Or is there an easier way? See Question&Answers more detail:os...

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

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141 views

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c++ - How do I cast a pointer to an int

I'm trying to store the value of an address in a non pointer int variable, when I try to convert it I get the ... [0] << endl; return 0; } See Question&Answers more detail:os...

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

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165 views

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c++ - Is `f().a[0]` an xvalue?

struct S{ int a[3] = {1,2,3}; }; S&& f(){return S();} &f().a; //[Error] taking ... an example that subscripting an array results an xvalue. 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++ - Which compiler is right? 'template' before templated return type needed?

This snippet (taken from this question) compiles fine with g++ (as seen), so long the template before the return type is ... ){ A<int,int> a; } See Question&Answers more detail:os...

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

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134 views

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c++ - How to run multiple QTest classes?

I have a subproject where I put all my QTest unit tests and build a stand-alone test application that runs the ... tests I have have failed. See Question&Answers more detail:os...

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

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393 views

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c++ - std::array constructor inheritance

I'm trying to get extended variant of std::array for math vectors (and expose same interface as array does without boilerplate ... ))...}) {} }; 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++ - If I don't odr-use a variable, can I have multiple definitions of it across translation units?

The standard seems to imply that there is no restriction on the number of definitions of a variable if it is ... Or is it undefined behaviour? 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++ - Initializing a static constexpr data member of the base class by using a static constexpr data member of the derived class

Consider the following code: template<typename T> struct S { static constexpr int bar = T::foo; }; struct U: S ... for it to accept the answer. See Question&Answers more detail:os...

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

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218 views

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c++ - Handle complex options with Boost's program_options

I have a program that generates graphs using different multi-level models. Each multi-level model consists of a ... . Is that even possible? See Question&Answers more detail:os...

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

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198 views

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c++ - Does an lvalue argument prefer an lvalue reference parameter over a universal reference?

While playing with universal references, I came across this instance where clang and gcc disagree on overload resolution. ... gcc's side :-) See Question&Answers more detail:os...

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

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103 views

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c++ - Understanding `std::is_move_constructible`

Types without a move constructor, but with a copy constructor that accepts const T& arguments, satisfy std:: ... that jumps to mind). See Question&Answers more detail:os...

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

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720 views

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c++ cli - C++ CLI Correct way to use #pragma managed / unmanaged

I'm writing a C++ / CLI application, but I want most of the code in my C++ DLL to run natively (i ... single CLI class C) Something else? 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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282 views

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c++ - Unaligned access through reinterpret_cast

I'm in the middle of a discussion trying to figure out whether unaligned access is allowable in C++ through ... and paragraph) in 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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174 views

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c++ - What is the purpose of the statement "(void)c;"?

Sorry for the vague title, but not really sure how to phrase it. So I was looking through the ... just missed something completely funky? See Question&Answers more detail:os...

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

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226 views

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c++ - How to get the address of an overloaded member function?

I'm trying to get a pointer to a specific version of an overloaded member function. Here's the example: ... problem could happen to others. See Question&Answers more detail:os...

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

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