Recent questions tagged C++11

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c++11 - Difference between char and signed char in c++?

Consider the following code : #include <iostream> #include <type_traits> int main(int argc, char* argv[]) { std:: ... signed char to a char) ? 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 - Initializing c++ std::bitset at compile time

I'm trying to initialize a std::bitset<256> at compile time with some of its indices, lets say 50-75 and ... wouldn't work for large indices? 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 control compiler flag invoked when specifing CMAKE_CXX_STANDARD?

I would like to have cmake manage the inclusion of the "-std=c++14" compiler flag. This is easy to do using the ... instead of "-std=gnu++14"? 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 - Move or swap a stringstream

I want to move a stringstream, in the real world application I have some stringstream class data member, which ... swap or move a stringstream? 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++ std::mem_fn with overloaded member function

When compiling the following code, Visual Studio reports: main.cpp(21): error C2664: 'std::_Call_wrapper<std::_Callable_pmd ... (ClassA(), 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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c++11 - How to efficiently compare vectors with C++?

I need advice for micro optimization in C++ for a vector comparison function, it compares two vectors for equality and ... I use C++11. 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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c++11 - How to initialize multiple variables in C++ to the same value?

Would this kind of variable assignment work? double a = 2.0, x, y, z = 0.5; Would the second line of code work ... x, y, z each to 0.5? 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 efficiently compare vectors with C++?

I need advice for micro optimization in C++ for a vector comparison function, it compares two vectors for equality and ... I use C++11. 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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c++11 - How to initialize multiple variables in C++ to the same value?

Would this kind of variable assignment work? double a = 2.0, x, y, z = 0.5; Would the second line of code work ... x, y, z each to 0.5? 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++ Forward declaring class scoped enumeration

I'm wondering if it's possible to forward declare an enum that's defined within another class scope. For example, ... there any way to do this? 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 use shared_ptr using PostThreadMessage?

I would like to upgrade my MFC production code to use the std::shared_ptr smart pointer when ... function signature using forward_as_tuple. 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 implicit conversions good or bad in modern C++?

In this proposal: N3830 Scoped Resource - Generic RAII Wrapper for the Standard Library a scoped_resource RAII ... , seems very convenient. 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++ function returning reference to array

Is there any other way to receive a reference to an array from function returning except using a pointer? Here is ... asked at the beginning :) 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 - Using c++ typedef/using type alias

I am reading C++ primer book and completely don't understand one line: using int_array = int[4]; typedef ... is int_array in for loop? 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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c++11 - Is specialization of std::to_string for custom types allowed by the C++ standard?

In C++11 and later, is it allowed to specialize std::to_string in the std namespace for custom types? namespace std { ... (c) << std::endl; } 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++ version supported by cuda 5.0

I can't find which version/which concepts of c++ is/are supported by CUDA 5.0. I could not find any ... a place to look for this information? 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 - Check if two types are equal in C++

How to check if types are equal in C++11? std::uint32_t == unsigned; //#1 And another snippet template<typename T> ... ? "unsigned" : "other"; } 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 - For std::tuple, how to get data by type, and how to get type by index?

The title says it: Given an std::tuple, I'd like to get the first element of a given type get the type of the ... =c++11 -Wall main.cpp -o main 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++ Thread taking reference argument failed compile

#include<iostream> #include<thread> using namespace std; void f1(double& ret) { ret=5.; } int main() ... and reference as thread parameter 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++ Thread taking reference argument failed compile

#include<iostream> #include<thread> using namespace std; void f1(double& ret) { ret=5.; } int main() ... and reference as thread parameter See Question&Answers more detail:os...

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

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351 views

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c++11 - C++ Thread taking reference argument failed compile

#include<iostream> #include<thread> using namespace std; void f1(double& ret) { ret=5.; } int main() ... and reference as thread parameter See Question&Answers more detail:os...

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

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317 views

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c++11 - For std::tuple, how to get data by type, and how to get type by index?

The title says it: Given an std::tuple, I'd like to get the first element of a given type get the type of the ... =c++11 -Wall main.cpp -o main See Question&Answers more detail:os...

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

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311 views

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c++11 - C++ Thread taking reference argument failed compile

#include<iostream> #include<thread> using namespace std; void f1(double& ret) { ret=5.; } int main() ... and reference as thread parameter 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 - Fixed-width integer literals in C++?

C++11 first introduced support for defining new literals into C++ by means of user-defined literals. Does C++ ... for types in <cstdint>? See Question&Answers more detail:os...

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

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398 views

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c++11 - std::move() is just casting?

I have read a few (pesudo) implementions of std::move(). And all are just casting away the reference ... optimization? Thanks in advance. 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 ip::tcp::socket.close() thread safe?

If there is a async_read on the socket ongoing, there should be a internal thread of io_service checking the ... a single strand my_strand? 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 - Changes between C++ standard working drafts?

N3337 is a working draft of the C++ standard that was published on 2012-01-16: N3337 (pdf) It has only ... location or in a standard format? 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 - Why use identity in forward definition for C++0x rvalue reference?

In A Brief Introduction to Rvalue References, forward is defined as follows: template <typename T> struct identity { typedef ... ) { return a; } See Question&Answers more detail:os...

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

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