Recent questions tagged C++

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Disclaimer: I'm quite new to the MSFT tech world and only started Windows Phone development a month or so ... is this not documented anywhere? 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 Delete selected row in QTableView

I want to delete a selected row from the table when I click on the delete button. But I can't find ... in the Qt documentation. 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++ - C++11: pass (lambda or other) function object by reference or value?

This was originally part of this question: Passing lambda declared using auto-keyword by non-const reference as ... by reference or value? 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++ - Cannot open include file: 'VersionHelpers.h': No such file or directory

I'm trying to use IsWindows7SP1OrGreater function, declared in VersionHelpers.h header. And I get: 'VersionHelpers.h': ... . What's the problem? 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 initialise an array of non-POD with operator new and initialiser syntax?

I have just read and understood Is it possible to initialise an array in C++ 11 by using new operator, but ... Why does this syntax not work? 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 avoid char input for an int variable?

The program below shows a 'int' value being entered and being output at the same time. However, when I entered a ... <<endl; } 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++ - Why doesn't std::bind account for function arity?

If I have this simple case: struct Foo { void bar(); void baz(int ); }; It makes sense that this ... right order without having to specify 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++ - g++ and clang++ different behaviour with friend template function defined inside a template class

Another question of type "who's right between g++ and clang++?" for C++ standard gurus. The following ... equals with more recent versions. 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++ - Number of comparisons made in median of 3 function?

As of right now, my functioin finds the median of 3 numbers and sorts them, but it always makes three ... make that nested if statement. 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++ - calling non constexpr function from constexpr allowed in some conditions

Coming from that question: How to build a custom macro that behaves differently when used as constexpr (like assert ... used in constexpr term. 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++ type/value mismatch at argument 1 in template parameter list

#include <iostream> using namespace std; template<class T> class people{ public: virtual void insert(T item)=0; ... of non-class type 'int' 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++ - Should bit-fields less than int in size be the subject of integral promotion?

Let's say I have following struct: struct A { unsigned int a : 1; unsigned int b : 1; }; What ... unsigned int is type of such expression) 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 does vkGetPhysicalDeviceMemoryProperties return multiple identical memory types?

So, I'm gathering some info about my device in Vulkan during initialization and find a unique (or rather, quite ... you would do with queues? 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++ - boost::enable_if class template method

I got class with template methods that looks at this: struct undefined {}; template<typename T> struct ... class template arguments Thank you 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 does std::bitset expose bits in little-endian fashion?

When I use std::bitset<N>::bitset( unsigned long long ) this constructs a bitset and when I access it via the ... etc.). Why be different here? 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++ - Suppression files for Qt memory leaks with Valgrind

I usually write my classes in C++ and check if they leak memory using valgrind on Linux platform. I'm not ... how to cope with this problem? 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 select next row in QTableView programmatically

I have QTableView subclass that I am marking and saving its state with this : connect(this, SIGNAL(clicked(const ... shall i do that ? 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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441 views

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c++ - std::vector::push_back a non-copyable object gives compiler error

I get compilation errors on g++ (GCC) 4.7.2 but not on MSVC-2012 when trying to std::vector::push_back ... (or another class with private ctor) 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 causes std::sort() to access address out of range

I understand that to use std::sort(), the compare function must be strict weak order, otherwise it will crash due ... that I should be aware of. 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++ - Rounding differences on Windows vs Unix based system in sprintf

I have problem on UNIX based systems sprintf does not round up properly value. For example double tmp = ... way on Win/Unix 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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537 views

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c++ - What is the cyclic dependency issue with shared_ptr?

I read about shared pointers and understood how to use. But I never understood the cyclic dependency problem ... explain this problem clearly? See Question&Answers more detail:os...

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

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605 views

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c++ - extern const char* const SOME_CONSTANT giving me linker errors

I want to provide a string constant in an API like so: extern const char* const SOME_CONSTANT; But if I ... export it with pointer const-ness? See Question&Answers more detail:os...

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

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312 views

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c++ - Qt - Centering a checkbox in a QTable

In QtCreater I added a table to my project. in my code I am generating some data to output into the ... (rowCount,0, new QCheckBox); See Question&Answers more detail:os...

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

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323 views

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c++ - Debugger steps deeper when trying to step out of C++11 std lib

I'm using (Apple) LLVM 4.1 within Xcode 4.5 (but I saw the same thing in an earlier beta). I have it ... but better still knows what's going on? 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 debug error "Symbol lookup error: undefined symbol"

I created an app (api_tests) that uses a library (libstorage.so) that linked to oracle occi library (libocci ... compiled but failes in runtime. See Question&Answers more detail:os...

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

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282 views

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c++ - Should we use temporary variables for the returned values of functions?

I thought about this: Is there a performance difference in these two practices: Store the return value of a function ... was the same. 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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319 views

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c++ - return (a) vs. return a

I have seen both in the C and C++ code I have been looking at. What is the difference? See Question&Answers more detail:os...

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

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461 views

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c++ - disallow passing of rvalue reference to a function

We have the following convenience function that fetches a value from a map or returns a fallback default ... and static assert? See Question&Answers more detail:os...

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

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