Recent questions tagged C++

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c++ - What does '**' mean in C?

What does it mean when an object has two asterisks at the beginning? **variable 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 enable_if_t in template arguments complains about redefinitions?

I have the following case that works using std::enable_if : template<typename T, typename std::enable_if<std::is_same ... if this is possible ? 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++ - iter_swap() versus swap() -- what's the difference?

MSDN says: swap should be used in preference to iter_swap, which was included in the C++ Standard for ... for backwards compatibility?) Why? 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++ - Initializing container of unique_ptrs from initializer list fails with GCC 4.7

I am trying to initialise an std::vector<std::unique_ptr<std::string>> in a way that is equivalent to an example ... the way to fix this error ? 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++ - Can I use identical names for fields and constructor parameters?

class C { T a; public: C(T a): a(a) {;} }; Is it legal? 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++ - Add Application to Startup (Registry)

I'm trying to add my software to registry, I have found some pieces of the codes I can use but not full ... 't already there... Thank you! 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++ - libzip with Visual Studio 2010

Is there anyway documentation for compiling libzip for Visual Studio 2010? Everything I have seen from the libzip ... has returned no results. 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++ - returning std::string/std::list from dll

Short question. I just got a dll I'm supposed to interface with. Dll uses crt from msvcr90D.dll (notice D), and ... dll). Am I right or not? 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++ - When to use `asio_handler_invoke`?

Question When is it necessary to use asio_handler_invoke to achieve something that cannot be done by simply wrapping ... a multi-threaded loop. 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++ - In the standard, what is "derived-declarator-type"?

In different places in the C++ (C++11) standard, declarations are described in terms of derived-declarator-type-list ... in the C++11 standard? 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++ - OpenCV to use in memory buffers or file pointers

The two functions in openCV cvLoadImage and cvSaveImage accept file path's as arguments. For example, when saving a ... to the IplImage format. 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 aren't copy constructors "chained" like default constructors and destructors?

Why aren't copy constructors chained (like default ctors or dtors) so that before the derived class's copy ... ) reason for this design? 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 tame the Windows headers (useful defines)?

In one of the answers to this question jalf spoke about useful define NOMINMAX, that could prevent from ... or STL implementation) 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++ - Implicit conversion when overloading operators for template classes

I would like to know why implicit type conversion doesn't work with outside operator overloading on class templates ... any workaround for this? 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 copy one map into another using std::copy?

I would like to copy the content of one std::map into another. Can I use std::copy for that? Obviously, the ... it work with std::copy? Thanks! See Question&Answers more detail:os...

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

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98 views

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c++ - Is opencv matrix data guaranteed to be continuous?

I know that, the data contained in an opencv matrix is not guaranteed to be continuous. To make myself clear, ... mat(nRows, nCols, CV_32FC1); 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++ - Templates: template function not playing well with class's template member function

This is a minimal test case of some code that I actually have. It fails when it tries to evaluate a. ... never encountered anything like this. See Question&Answers more detail:os...

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

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180 views

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c++ - get part of std::tuple

I have a tuple of unknown size (it's template parametr of method) Is it way to get part of it (I need throw ... want tuple<int,int>(12,42) here See Question&Answers more detail:os...

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

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237 views

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c++ - Why use ++i instead of i++ in cases where the value is not used anywhere else in the statement?

I'm well aware that in C++ int someValue = i++; array[i++] = otherValue; has different effect compared to int ... i++ in the latter two cases? 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 the size of a pointer to a function is different from the size of a pointer to a member function?

Isn't a pointer just an address? Or I'm missing something? I tested with several types of pointers: pointers ... some rare and special ones)? See Question&Answers more detail:os...

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

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305 views

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c++ - cannot convert parameter 1 from 'char' to 'LPCWSTR'

I keep getting this error: cannot convert parameter 1 from 'char' to 'LPCWSTR' int main(int argc, char argv[] ... open port"); can someone help? 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++ - Inspecting STL containers in Visual Studio debugging

If I have a std::vector or std::map variable, and I want to see the contents, it's a big pain ... variables while debugging (VS2003/2005/2008)? 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++ - VS 2015 compiling cocos2d-x 3.3 error "fatal error C1189: #error: Macro definition of snprintf conflicts with Standard Library function declaration"

When I compile cocos2d-x (version 3.3) using visual studio 2015, an error occured, saying: fatal error C1189: ... can tell me what's wrong? 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 make a variadic is_same?

How can I make a class template that returns whether any of its variadic types are equal to the first type. I want ... false. How can I do this? See Question&Answers more detail:os...

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

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100 views

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c++ - Why is this ambiguity here?

Consider I have the following minimal code: #include <boost/type_traits.hpp> template<typename ptr_t> struct TData { ... in operator[](size_t). See Question&Answers more detail:os...

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

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93 views

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c++ - Element at index in a std::set?

I've stumbled upon this problem: I can't seem to select the item at the index' position in a normal std::set. Is ... I can do to fix the issue? See Question&Answers more detail:os...

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

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118 views

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c++ - Class template for numeric types

How do I write a class template that accepts only numeric types (int, double, float, etc.) as template? See Question&Answers more detail:os...

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

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628 views

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c++ - Copying non null-terminated unsigned char array to std::string

If the array was null-terminated this would be pretty straight forward: unsigned char u_array[4] = { 'a', 's ... char array? Thank you all. See Question&Answers more detail:os...

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

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