Recent questions tagged C++

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c++ - How can i avoid name mangling?

How can I avoid name mangling in C++? 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++ - iterator adapter to iterate just the values in a map?

I'm just getting back into C++ after a couple of years of doing a lot of C#, and recently Objective C. ... Boost, or somewhere else ready made? 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++ - Piping (or command chaining) with QProcess

I'm using Qt and bash over it, need to execute something like: bash: cat file | grep string in Qt: ... other transforms also have bad result. 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++ - How to convert "pointer to pointer type" to const?

With the following code void TestF(const double ** testv){;} void callTest(){ double** test; TestF(test); } ... about const that I'm missing? 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++ - Does the standard mandate an lvalue-to-rvalue conversion of the pointer variable when applying indirection?

TL;DR Given the following code: int* ptr; *ptr = 0; does *ptr require an lvalue-to-rvalue conversion of ... way to get to undefined behavior. 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++ - Is std::cout buffered?

Just reading an old but interesting article by "Scott Meyers" http://aristeia.com/Papers/C++ReportColumns/ ... I have always understood? 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++ - How does the linker handle identical template instantiations across translation units?

Suppose I have two translation-units: foo.cpp void foo() { auto v = std::vector<int>(); } bar.cpp ... Does the linker remove them as duplicates? 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++ - About thread-safety of weak_ptr

std::shared_ptr<int> g_s = std::make_shared<int>(1); void f1() { std::shared_ptr<int>l_s1 = g_s; // ... destory will motify g_w (write g_w) } 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++ - Using Boost adaptors with C++11 lambdas

I tried to compile this code: #include <boost/range/adaptors.hpp> #include <boost/range/algorithm.hpp> #include < ... way to make this work? 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++ - Generate include file name in a macro

I'm trying to generate include file name in macro. This is supposed to be legal in C++: #define INCLUDE_FILE " ... can I get rid of 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++ - Get signatures of exported functions in a DLL

Is it possible to get an exported (C style?) function's signature (parameter count/types, return type) from a ... pointing to at the call time. 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 a virtual function get hidden?

I have the following classes: class A { public: virtual void f() {} }; class B : public A{ public: void ... A, which shows the same behaviour. 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++ - Explanation of function pointers

I have a problem with understanding some C++ syntax combined with function pointers and function declarations, that is ... C++14 option enabled. 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++ - Variadic templates

I have seen a lot of links introducing the variadic templates. But I have never seen any compilable example ... examples can be found? 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++ - What is GCC's "vstring"?

I read some GCC bugreport and people there were talking about "vstring". Searching the WEB I came to notice http: ... it instead of std::string? 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++ - How can I use C++14 features when building qmake projects?

I'm currently using C++11 features in my Qt applications. However, I'd like to use some of the new C++14 features ... , and MinGW 4.8.2 32 bit. 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++ - Classes with both template and non-template conversion operators in the condition of switch statement

The problem originally arose in this question. Consider the following code: class Var { public: operator int () ... ^ Which compiler is correct? 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++ - How to cheaply assign C-style array to std::vector?

Currently I do the following: // float *c_array = new float[1024]; void Foo::foo(float *c_array, size_t ... copy but just swap pointers. 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++ - Is the Empty Base Class Optimization now a mandatory optimization (at least for standard-layout classes)?

According to C++11 9.1/7 (draft n3376), a standard-layout class is a class that: has no non-static data ... correct, or am I missing something? 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++ - Inconsistent strcmp() return value when passing strings as pointers or as literals

I was playing around with strcmp when I noticed this, here is the code: #include <string.h> #include <stdio. ... allocated in its stack right? See Question&Answers more detail:os...

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

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776 views

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c++ - std::remove_if - lambda, not removing anything from the collection

Ok, I expect I've made a dumb mistake here. I have a list of DisplayDevice3d and each DisplayDevice3d contains a list of ... .size() == 0; }); 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++ - Equivalent of "using namespace X" for scoped enumerations?

I am using a scoped enum to enumerate states in some state machine that I'm implementing. For example, let's say ... file, and not for evil. 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 isn't there int128_t?

A number of compilers provide 128-bit integer types, but none of the ones I've used provide the typedefs ... conforms to that last point) 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++ - How to use boost preprocessor to generate accessors?

For example class A { int m_x; float m_y; double m_z; int x() const {return m_x;} float y() ... which already use boost preprocesor sequence. 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++ - How to save two camera's data but not influence their picture-acquire speed?

I am using a multispectral camera to collect data. One is near-infrared and another is colorful. ... bIsCameraReady, BOOL bIsImageAcquiring); See Question&Answers more detail:os...

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

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423 views

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c++ - problem with sizeof operator

As i want to find array size dynamically in function, i used sizeof operator. But i got some unexpected result. ... done to solve this problem. See Question&Answers more detail:os...

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

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358 views

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c++ - Overloading operator<< for a templated class

I'm trying to implement a method for a binary tree which returns a stream. I want to use the stream ... declared: BinaryTree< Word > tree. 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++ - Borderless Window with Drop Shadow

I'm trying to achieve something like Visual Studio installer does with borderless window and drop shadow: I ... ); UpdateWindow(_mainWnd); See Question&Answers more detail:os...

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

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