Recent questions tagged C++

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c++ - Defining a variable in the condition part of an if-statement?

I was just shocked, that this is allowed: if( int* x = new int( 20 ) ) { std::cout << *x << "! " ... thing, that came to my mind, as an example. 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 do I get the window handle of the desktop?

The Windows API provides an API GetDesktopWindow( ) which returns the window handle But I tested with Spy++ and ... this using the Windows SDk 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 a wide character string literal starting with L like L"Hello World" guaranteed to be encoded in Unicode?

I've recently tried to get the full picture about what steps it takes to create platform independent C++ ... files plus proper compiler options? 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 a class in DLL?

Can I put a class inside a DLL? The class i wrote is this: class SDLConsole { public: SDLConsole(); ~SDLConsole( ... a DLL? Thank you very much. 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++ - Tell gdb to skip standard files

I'm debugging C++ code with GDB and when it enters a constructor of some object containing standard library objects, ... next "user-land" code. 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 everybody use unanchored namespace declarations (i.e. std:: not ::std::)?

It seems to me that using unanchored namespaces is just asking for trouble later when someone puts in a new ... s a rather startling prop. 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++ - Calling assignment operator in copy constructor

Are there some drawbacks of such implementation of copy-constructor? Foo::Foo(const Foo& i_foo) { *this = i_foo; } ... I don't remember, 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++ - AllocConsole() not displaying cout

I have a DLL where I use AllocConsole() and cout to display data for debugging purposes. It used to work ... endl; But nothing gets displayed. 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++ - STL Rope - when and where to use

I was wondering under what circumstances you would use a rope over another STL container? 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++ - GCC equivalent of MS's /bigobj

We are making heavy use of boost::serialization and templates in general. All seems to be going well. Except, we've ... that I'm not yet 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++ - Is it possible to prevent stack allocation of an object and only allow it to be instantiated with 'new'?

Is it possible to prevent stack allocation of an object and only allow it to be instiated with 'new' on the heap? 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++ - std::unique_ptr for C functions that need free

Think to a C function that return something that must be freed, for example the POSIX's strdup(). I want ... function open that returns an int? 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++ - friend class with limited access

I want to make a class A friend class of class B. I want to do this as these interact very much and A ... access at all in this case. 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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c++ - How to use libraries compiled with MingW in MSVC?

I have compiled several libraries with MingW/MSYS... the generated static libraries are always .a files. When I ... app. Thanks for any advice. 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++ - Creating array of objects on the stack and heap

Consider the following code: class myarray { int i; public: myarray(int a) : i(a){ } } How can you create ... an array of objects on the heap? 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++ - BOOST_STATIC_ASSERT without boost

Since boost is forbidden in a company I work for I need to implement its functionality in pure C++. I've looked ... to use any C++0x features. 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 set Visual Studio Filters for nested sub directory using cmake

I have following structure Main (dir) +-- CMakeLists.txt +-- File.cpp +-- File.hpp +-- Dir (dir) + ... will work for any level sub directory 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++ - Inserting into an unordered_set with custom hash function

I have the following code to make an unordered_set<Interval>. This compiles fine. struct Interval { unsigned int begin; ... Hash*' to Hash*' 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++ - Switch passed type from template

Is it possible in C++ to check the type passed into a template function? For example: template <typename T> void Foo() ... ) == 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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c++ - Random number generator that produces a power-law distribution?

I'm writing some tests for a C++ command line Linux app. I'd like to generate a bunch of integers with a power ... C/C++ would be great. 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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c++ - Why is CLOCKS_PER_SEC not the actual number of clocks per second?

I have just written this short C++ program to approximate the actual number of clock ticks per second. #include < ... What's going on 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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c++ - Visual studio 2015 run-time dependencies or how to get rid of Universal CRT?

Compiled couple of .dll's using visual studio 2015, and tried to deploy on some older windows 7 / 64 bit. ... Visual studio 2017 to arrive ? 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 implement 2D vector array?

I'm using the vector class in the STL library for the first time. How should I add to a specific row of ... have a different number of columns)? 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 does std::end know the end of an array?

std::begin and std::end know the beginning and end of a container or an array. It so easy to know ... answer with some low-level information. 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++ - C++11 Thread safety of Random number generators

In C++11 there are a bunch of new Random number generator engines and distribution functions. Are they thread safe ... }); } using libdispatch. See Question&Answers more detail:os...

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

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133 views

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c++ - std::string in a multi-threaded program

Given that: 1) The C++03 standard does not address the existence of threads in any way 2) The C++03 ... ? And what is a good workaround? See Question&Answers more detail:os...

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

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211 views

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c++ - What's the motivation behind having copy and direct initialization behave differently?

Somewhat related to Why is copy constructor called instead of conversion constructor? There are two syntaxes for initialization, ... So... 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++ - <dirent.h> in visual studio 2010 or 2008

I want to use #include<dirent.h> in my code but this error happen: Cannot open include file: 'dirent.h': No ... How can I 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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