Recent questions tagged C++

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c++ - How to link google protobuf libraries via cmake on linux?

I'm trying to make it same way I made it for boost : find_package(Boost COMPONENTS system filesystem REQUIRED) ... .proto file using cmake? 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++ - Multiple inheritance casting from base class to different derived class

Let's assume there is such class hierarchy: class A //base class class B //interface class C : public A ... know that it implements interface B 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 stack memory contiguous?

How does the compiler enforce the stack memory to be contiguous, does it cause the memory to be moved ... by program before running 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++ mark enum value as deprecated?

Is it possible to mark an enum value as deprecated? e.g. enum MyEnum { firstvalue = 0 secondvalue, thirdvalue, / ... a MSVC and a GCC solution. 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 find the memory used by any object

class Help { public: Help(); ~Help(); typedef std::set<string> Terms; typedef std::map<string, std::pair< ... termsMap. Do we have any library ? 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 .dll files loaded once for every program or once for all programs?

I have a simple small question which someone who knows will be able to answer easily, I searched google but ... addresses to call the functions? 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++ - replacement for std::binary_function

std::binary_function is deprecated now and is going to be deleted in c++17. I searched on different publications, ... , inside a for-loop. 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 intentionally cause a compile-time error on template instantiation

Sometimes when coding with C++ templates, you want to prevent users from instantiating a specific specialization or set of ... are valid C++03. 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 link a .DLL statically?

We have a (pure native C++) .DLL that is build by VS. As clients we have some native C++ ... VS generate two outputs from one project 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++ - Error with copy constructor/assignment operator for a class which has std::atomic member variable

I have a class like below. #include <atomic> static const long myValue = 0; class Sequence { public: Sequence(long ... using gcc version 4.6.3 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++ - OpenCV 3.x only contains one lib - opencv_world.lib?

I'm trying to update my OpenCV version from 2.4.9 to the newest version, 3.10. I downloaded the Windows ... this recently and have a solution? 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 can't namespaces be template parameters?

I understand that namespaces cannot be template parameters. See the question, "template specialized on a ... implementing this functionality? 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++ - Can parameter pack function arguments be defaulted?

This is a point about which gcc 4.9.2 and clang 3.5.2 are in sharp disagreement. The program: ... default argument Which compiler is right? 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 alternative to std::remove_if to remove elements from a vector?

The task of removing elements with a certain property from a std::vector or other container lends itself to a functional ... this? If not, why? 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 is it ambiguous to call overloaded ambig(long) and ambig(unsigned long) with an integer literal?

When compiling void ambig( signed long) { } void ambig(unsigned long) { } int main(void) { ambig(-1 ... considered ambiguous in the first 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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c++ - Why is std::numeric_limits<T>::max() a function?

In the C++ Standard Library the value std::numeric_limits<T>::max() is specified as a function. Further ... 's the rationale behind 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++ - Candidate template ignored because template argument could not be inferred

What is wrong with the following piece of code? #include <iostream> template<typename K> struct A { struct X { K p ... y) { ^ 1 error generated. 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 is volatile deprecated in C++20?

According to cppreference, most uses of the volatile keyword are to be deprecated in C++20. What is the ... solution when not using volatile? 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 good are public variables then?

I'm a total newbie with tons of ?'s in my mind and a lot to experience with C++ yet! There's been ... variables? Do you use that at all? 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++ - Specifying a lambda function as default argument

How do I assign a lambda as default argument? I would like to do this: int foo(int i, std::function<int(int) ... version of gcc (4.7-20120225). 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 I add elements to an empty vector in a loop?

I am trying to create an empty vector inside a loop, and want to add an element to the vector each time ... this is giving me error messages. 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++ - Erasing vector::end from vector

Does it works correct(does nothing) when I use vector<T> v; v.erase(v.end()); I want to use something ... about it on C++.com and CPPreference 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::chrono and cout

I have a stupid problem. I try to switch to the c++11 headers and one of those is chrono. But my ... )t.time_since_epoch(); gives invalid cast 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++ - Explicitly initialize member which does not have a default constructor

I′m trying to instantiate an object which has no default constructor so it can be referenced from any methods inside the ... :cout << aNumber; } 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 _GLIBCXX_USE_NANOSLEEP all about?

A preprocessor macro called _GLIBCXX_USE_NANOSLEEP appears in two standard header files: c++/4.7.1/x86_64-unknown- ... in Jonathan's 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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c++ - Is it possible to read infinity or NaN values using input streams?

I have some input to be read by a input filestream (for example): -365.269511 -0.356123 -Inf 0.000000 ... from other programs, such as MatLab. 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++ - Preferred conversion from char (not char*) to std::string

I have a char, a plain old character, that I would like to turn into an std::string. std::string(char) doesn ... . So what's the preferred 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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c++ - Class method as winAPI callback

Is it feasible to set the winAPI message callback function as a method of a class. If so, how would this be ... responses. Thanks in advance :). See Question&Answers more detail:os...

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

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