Recent questions tagged c++

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c++ - How to sort a vector containing const values

I have a vector set up like this and I want to sort it: #include <iostream> #include <vector> #include < ... new vector and copying values over? 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 a C-style cast identical to a function-style cast?

From this answer to the question "When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?": C- ... static_cast<int>(d);. 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 know library variable names for CMakeLists?

When using CMakeLists to compile an OpenGL project, I have the following line to link glut and gl: target_link_libraries( ... I want to use)? 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 print the address of char array

http://ideone.com/4p1gqr #include <iostream> int main(int argc, char** argv) { float *f = new float[10]; ... to print the address of char array? 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++ - string.find() returns true when ==-1 is used but false when <0 is used

I am trying to find a character within a string but I am getting unexpected results. My understanding is that ... endl; //Output: Not Found 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++ - Passing unnamed classes through functions

How do I pass this instance as a parameter into a function? class { public: void foo(); } bar; Do I have to ... So how is it possible if 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++ - How can I make OpenCV the default library for my qt projects?

Please suppose that I want to link OpenCV libraries in Qt-creator, in common, I will add headers ... /usr/local/include/opencv4 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++ - Check COM pointers for equality

If I have two COM interface pointers (i.e. ID3D11Texture2D), and I want to check if they are the same underlying ... { return false; } } 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++ - 'unlockEnvironment' implemented via 'Rcpp' instead of 'inline'

Actual question Could someone get me started on what I need to do to implement the code of unlockEnvironment ... functions when using inline? 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 QSharedPointer with new[] yields "Mismatched free() / delete / delete[]" in valgrind

I have the following code: QPair<QSharedPointer<unsigned int>, int> someclass::somefunction() { int siz = ... live with this valgrind warning? 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++ - Passing pointer of dynamic var by reference

I'm trying to create dynamic variable and pass its address by reference within new_test function, but it doesn't ... delete test1; 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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c++ - Template parameters not used in partial specialization

I have the following code: template<typename T, typename Allocator = std::allocator<T> > class Carray { // ... Allocator' has not been declared 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++ - Qt: windows functions are unresolved external symbols

I'm trying to compile a simple helloworld-like non-Qt C++ application using te WinAPI in QtCreator. Here's the ... file contents. So, any ideas? 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++ - Overwriting an object with an object of same type

Is the following well defined? #include <iostream> #include <string.h> using namespace std; struct Const { const ... "this is ridiculous". 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 I wrap a T* in an std::vector<T>?

I have a T* addressing a buffer with len elements of type T. I need this data in the form of an std::vector< ... be able to shove in our own? 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 C++0x support Anonymous Inner Classes?

Say I have listeners built in C++98, they are abstract and must for example implement ActionPerformed. In C++0x ... do something. } }); 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++ - Check if two types are of the same template

I want to check if two types are of the same template. As an example I want the following snippet of code to ... cout << CheckTypes(v1,v2); } 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 you assign an integer value to an uninitialized pointer

When I do this, it prints out "2" perfectly. int main() { int *p; int x = 2; *p = x; cout << * ... know whether (c) works is purely due to luck. 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 __muldc3 called, when two std::complex are multiplied?

I naively assumed, that the complex number multiplication would be inlined by the compiler, for example for ... for the resulting assembler? 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++ - AVX: data alignment: store crash, storeu, load, loadu doesn't

I am modifying RNNLM a neural net to study language model. However given the size of my corpus it's running ... thank you in advance, Arkantus. 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++ - OpenGL shaders don't compile

The shaders in my OpenGL project don't compile. I have Ubuntu 16.04 LTS, using CLion. Didn't find any solution, ... a project. Here's its link. 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++ - cmath header confusion

What is the namespace for math functions? Global or std? Consider cos function. It has 3 overloads. But there is ... x). Did I miss anything? 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++ - Algorithm for removing elements

I understand there is erase-remove idiom for c++. And the remove method under <algorithm> will move target ... not compare equal to val. 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 inheritance and a base member variable

I get a weird error when trying to use template inheritance. This is my code: template <class T> ... classes without templating works fine. 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++ - Serialize and deserialize vector in binary

I am having problems trying to serialise a vector (std::vector) into a binary format and then correctly deserialise it ... that I need to do? See Question&Answers more detail:os...

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

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369 views

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c++ - Why overloaded ' operator < ' should be const for class?

Can anybody explain this behavior in context of STL sort algorithm? If operator < is not defined const it gives error, error ... .end()); ... } See Question&Answers more detail:os...

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

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170 views

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c++ - How do I grok boost spirit compiler errors

I am trying to use the no_skip directive to parse input of the form: state PASS <tab> state FAIL I am using ascii::blank as my ... "PASS"; //test_parser(" ",+char_("a-zA-Z")); }...

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

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475 views

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c++ - How to make the login part in QuickFIX

How can I make the login part in QuickFIX in c++? I found tons of tutorials and articles on how to do this ... the server. Can anyone help 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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