Recent questions tagged C++

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c++ - use static class variable/function across dlls

I need help access global functions across DLLs/main program. I have a class Base Base.h #ifdef MAIN_DLL #define ... < "Error"; Thanks, Gasim 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 xml-stylesheet processing instructions to boost property_tree

I am using boost/property_tree to create an XML file. Unfortunately I cannot figure out how to add xml- ... with boost/property_tree/ptree? 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++ - ambiguous call to overloaded function - int and int&

void g(int& a) { std::cout<<"int& "; } void g(int a) { std::cout<<"int "; } int main() { int a ... ? something like g( static_cast<int&>(a) ); 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 allow templated functor work on both member and non-member functions

I got this logging templated functor template<typename RetType, typename Arg1Type, typename Class> class Logger { public: ... to not use 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++ - How to push_back without operator=() for const members?

How to push_back() to a C++ std::vector without using operator=() for which the default definition ... 't use default assignment operator 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++ template singleton static pointer initialization in header file

What is wrong with this implementation in header file? template <typename T> class Singleton { public: static ... need to explicitly initialize? 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++ - After an object is destroyed, what happens to subobjects of scalar type?

Consider this code (for different values of renew and cleanse): struct T { int mem; T() { } ~T() { ... 3: now with another cleanse parameter! 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++ - Fastest way to extract individual pixel data?

I have to get information about the scalar value of a lot of pixels on a gray-scale image using OpenCV. ... channel (brightness) of the image? 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++ - Sphere Calculations

So I have created all of the correct sphere vertices using this algorithm: GLint total = 100; GLfloat radius = ... (GL_TRIANGLES, 0, 10000); 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 get the exact message from recv() in winsock programming?

I'm developing a server-client application using Winsock in c++ and have a problem. For getting the ... What am I 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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179 views

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c++ - Constructing std::function argument from lambda

I have the following templated function (C++ latest standard is enabled in the compiler - but maybe 17 would be ... via some "callable traits"? 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++ - force exit from readline() function

I am writing program in c++ which runs GNU readline in separate thread. When main thread is exited I ... readline function? Thanks in advance. See Question&Answers more detail:os...

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

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287 views

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c++ - struct sizeof result not expected

I have a a struct defined thusly: typedef struct _CONFIGURATION_DATA { BYTE configurationIndicator; ULONG32 baudRate; BYTE ... the Windows DDK. See Question&Answers more detail:os...

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

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306 views

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c++ - How to get tooltip text for a given HWND?

I'm looking for a way to get the tooltip control (if any) which is associated with a given HWND. The text of ... using plain Windows API 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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340 views

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c++ - Too many initializers error for a simple array in bcc32

Compiling the following example struct S {}; int main() { S array[1] = { S() }; } with bcc32 ... and GCC compile this example without problems. See Question&Answers more detail:os...

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

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218 views

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c++ - OpenCV 3.0 Can't load neural network

I need to use a neural network in my OpenCV (version 3.0) project. I've created and trained neural network ... wrong? Where is the 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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c++ - Using operator new and operator delete with a custom memory pool/allocator

I'm working on a memory pool/memory allocator implementation and I am setting it up in a manor where only a ... advance to anyone who can 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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512 views

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c++ - std::cout deal with uint8_t as a character

If I run this code: std::cout << static_cast<uint8_t>(65); It will output: A Which is the ASCII equivalent of the ... P.S. I am using MSVS 2013. See Question&Answers more detail:os...

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

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184 views

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c++ - Comparing std::tr1::function<> objects

I've been trying to implement a C#-like event system in C++ with the tr1 function templates used to store a ... will be a bit clumsy :) See Question&Answers more detail:os...

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

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222 views

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c++ - How to check std::string if its indeed an integer?

The following code converts an std::string to int and the problem lies with the fact that it cannot discern from a ... <std::endl; return 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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305 views

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c++ - Why does explicit template instantiation not break ODR?

This question arised in the context of this answer. As I would expect, this translation unit does not compile: ... avoid this sort of 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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158 views

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c++ - How to link libs in netbeans (linux)?

I'm trying to write a program in c++ to analyze sound. I want to use libsndfile library. I added an option - ... } WavReader::~WavReader() { } } See Question&Answers more detail:os...

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

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264 views

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c++ - Converting Unicode to Multibyte

I have smalll problem i want to convert unicode into Multi byte is there any way See Question&Answers more detail:os...

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

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356 views

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c++ - Non-repeating random number generator

I'd like to make a number generator that does not repeat the number it has given out already (C++). ... reappear. Does anyone know the syntax? See Question&Answers more detail:os...

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

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181 views

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c++ - Eclipse can't find header filers even though include paths have been set

When creating a new C project in a particular Eclipse environment which uses GCC, I run into a peculiar linker ... of this problem with others) See Question&Answers more detail:os...

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

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102 views

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c++ - Spirit unable to assign attribute to single-element struct (or fusion sequence)

My goal is to have my qi::grammar return an attribute. I'm having significant difficulty doing this with a spirit:: ... ::basic_string<char>, char, unsigned long> >' requested here...

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

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190 views

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c++ - Is not calling delete on a dynamically allocated object always a memory leak?

From the discussion started here, I'd like to know whether the following code has a memory leak: int main() { ... whatever have to say about 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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174 views

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c++ - map with incomplete value type

I'm getting an error with the following: class Test { std::map<std::string,Test> test; }; The error is " ... error and not a bug. Cheers! See Question&Answers more detail:os...

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

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