Recent questions tagged C++11

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In C++ using ptree from boost, I need to find the relative key to access a.b.c2.e1 from a.b. This key is c2 ... ,pt_b)<<std::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++11 - performing vector intersection in C++

I have a vector of vector of unsigned. I need to find the intersection of all these vector of unsigned's for ... in vector "t" are sorted. 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++11 - Clone pattern for std::shared_ptr in C++

Why do you need (in order to make it compile) the intermediate CloneImplementation and std::static_pointer_cast (see Section ... b->Clone(); } 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++11 - c++ chrono duration_cast to milliseconds results in seconds

I want to have the number of milliseconds since epoch. A popular solution looks like follows (one of the solutions of this ... .8.1-2) 4.8.1 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++11 - CUDA: how to use barrier.sync

I have read https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#parallel-synchronization-and-communication- ... return 1; } 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++11 - How can I write a template function that takes a generic C++ standard library container

I have a function that needs to be able to work for different container types, for example void foo(const ... /definition I'm using MSVC2015. 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++11 - What part of regex is supported by GCC 4.9?

I don't get this. GCC is supposed to support but accoriding to their http://gcc.gnu.org/onlinedocs/libstdc++/ ... the standard and what is not? 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++11 - C++ size_t modulus operation with negative operand

So there are three values that a modulus operation can give you: Then: -7 % 5 = 3 (math, remainder >= ... unsigned operands calculated in C++? 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++11 - C++ compiler that supports C++0x features?

Is where any C++ compiler that supports C++0x features already? 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++11 - C++. How to return null pointer instead of function return type?

I have a function that checks regex and returning std::vector<int> according to regex result. I need to check if ... == nullptr) // do smth 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++11 - Finding the closest floating point value less than a specific integer value in C++?

I have an input floating point value that is 0.0f <= value < 1.0f (note less than one). When multiplying this ... and std::nexttoward for C++03? 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++11 - Can't create Direct2D DXGI Surface

I'm calling this method: http://msdn.microsoft.com/en-us/library/dd371264(VS.85).aspx The call fails with ... I am running a DX11 system. 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++11 - std::bind a member function to an object pointer

I have class with member functions: typedef std::function<bool (const std::string &)> InsertFunction; bool ... more info, please ask! 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++11 - literal and rvalue reference

void test(int && val) { val=4; } void main() { test(1); std::cin.ignore(); } Is a int is created ... by default in c++ literals are int type? 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++11 - Is the sealed command c++ 0x or is it only microsoft who has it

Is the sealed command going to be in c++ 0x or is it only MS who use 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++11 - Are variable length arrays an extension in Clang too?

I understand that VLAs are not part of C++11 and I have seen this slip by GCC. It is part of the reason ... generator); return i + random_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++11 - Does x86-SSE-instructions have an automatic release-acquire order?

As we know from from C11-memory_order: http://en.cppreference.com/w/c/atomic/memory_order And the same from C++11 ... -acquire of order, is 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++11 - How to use static_assert for constexpr function arguments in C++?

I have several brief constexpr functions in my libraries that perform some simple calculations. I use them both in run- ... ? mMax : mValue); } 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++11 - Is unique_ptr<Derived> to unique_ptr<Base> up-casting automatic?

I know it is possible that a derived class unique_ptr can take place where base class unique_ptr is required ... perform it using dynamic_cast? 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++11 - Unusual C++ linker error - 'Defined in discarded section'

I am attempting to link my program executable, but I keep getting errors. Having boost::this_thread:: ... -virtual thunk to boost::exception_detail::error_info_injector<boost::...

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

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c++11 - R-value in C++0x

Rvalues IMHO are great improvement in C++, but at the beginning they're quite confusing. Please look at code below ... returned by foo(), right? 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++11 - Cout a whole array in c++

I am fairly new to c++, is there a way in c++ through which we can cout a whole static array apart from ... of the first element in the 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++11 - Can non-special C++ member functions be deleted (or defaulted)?

A lot of attention has been received by = default and = delete with respect to the special members (default ... any restrictions on its 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++11 - C++ guarantee and name for POD-like data, memcpy capable

In another question I incorrectly used the term POD to refer to data types that aren't actually POD types (on ... implies memcpy would be safe. 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++11 - C++ detecting free function existence with explicit parameters

I'm writing some type traits to see if a free function exists with a specific set of parameters. The functions have ... int>(); // return false 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++11 - C++ lambda - capture member variable

I have a class that has function pointer to kernel function, that can change from outside. class Bar { public: ... is not very nice solution. 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++11 - No type named 'unique_ptr' in namespace 'std' when compiling under LLVM/Clang

I'm catching a compile error when attempting to use unique_ptr on Apple platforms with -std=c++11: $ make c++ -std ... argv[]) { return argc; } 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++11 - Is it safe to create a const reference to result of ternary operator in C++?

There's something quite non-obvious going on in this code: float a = 1.; const float & x = true ? a : 2.; // Note: ... < ", " << x; output: 4, 3 See Question&Answers more detail:os...

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

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