Recent questions tagged C++

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c++ - What is the difference between square bracket arrays and pointer arrays?

As a non-C/C++ expert I always considered square brackets and pointers arrays as equal. ie : char * ... key concept of that languages. 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++ - Which tags are required in the manifest for registration free COM?

TL;DR Do all registry entries produced by regsvr32 need to be present in a SxS reg-free-COM manifest and vice ... 't request a specific version? 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++ - Compiling and Using JSONCPP on Visual Studio10 with Boost

I have recently compiled the SVN version of JSONCPP using the VS71 makefiles. It worked, but I get a ... ) already defined in JSONCPP.lib(json_writer.obj) 1>...

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

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c++ - Do inline functions have addresses?

In section 7.1.1 of the book "The C++ Programming Language" the author states: "inline function still has a ... Does this happen in C also? 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++ - multiple threads writing to std::cout or std::cerr

I have OpenMP threads that write to the console via cout and cerr. This of course is not safe, since output ... such a class for that purpose? 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 call a function after every 15 seconds using QT

I know my question is similar to this QUESTION but i cant find solution from there. Can anyone give a ... with timer or something like that 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++ - Reducing code duplication between operator= and the copy constructor

I have a class that requires a non-default copy constructor and assignment operator (it contains lists of ... and the assignment operator? 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 detect the first and the last argument in the variadic templates?

How to detect the first and the last argument in the variadic templates? For the 1st argument it is easy (just compare ... 5) << 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++ - Prevent a QMenu from closing when one of its QAction is triggered

I'm using a QMenu as context menu. This menu is filled with QActions. One of these QActions is checkable, and I ... no luck. Any ideas? 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++ - Basic spin-lock mutex implementation ordering

There is a popular spin-lock mutex version which is spreaded across the Internet and which one might encounter in ... truth - comment on 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++ - vector::push_back insists on using copy constructor though a move constructor is provided

I was receiving a strange error from gcc and cannot figure out why. I made the following example code to make the ... helpful to me. 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++ - Alternative to std::function for passing function as argument (callbacks, etc.)

I stumbled across this during my experiments with C++11. I find that it is an obvious solution, but I haven't ... famous last words 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++ - Creating an std::unordered_map with an std::pair as key

I am trying to create an std::unordered_map with an std::pair as key. As you can imagine, this would require me to ... , PairHash<int, int> > > >' insert(const value_type& __x)...

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

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c++ - How can a returned object be assignable?

In Effective C++, Item 3, Scott Meyers suggests overloading operator* for a class named Rational: class Rational ... problem I exposed 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++ - How an 'if (A && B)' statement is evaluated?

if( (A) && (B) ) { //do something } else //do something else The question is, would the statement ... right side if the left is 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++ - <: cannot begin a template argument list

I get an error <: cannot begin a template argument list on g++ compiler. Code template<typename T> class ... ; SomeClass<::Class>* cls; 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 `std::function` allowed to move its arguments?

While working on this question, I noticed that GCC (v4.7)'s implementation of std::function moves its ... multiple occurrences of placeholders? 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++ - _GLIBCXX_USE_CXX11_ABI, GCC 4.8 and ABI compatibility

We received some libraries (.a) compiled for linux (probably compiled with GCC 6.x). We are using GCC 4.8 and ... we can make this work? 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++ - How to debug programs with "sudo" in VSCODE

I am trying to debug a program in VSCODE. The program needs to be launched as root or with "sudo" ... configuration would be helpful. 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++ - Why is this const const const declaration valid

A friend asked me to explain why const const const const const int const i = 0; is valid syntax. I declined ... should probably add the C tag. 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 create a cmake header-only library that depends on external header files?

I have a project with the following file structure: project | |-------> lib1 | |----> lib1.h | |---- ... What's the problem in the cmake files? 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++ - Function checking if an integer type can fit a value of possibly different (integer) type

Is it possible to create a templated function that checks if a primitive data type can fit a value of potentially ... was inspired by this post 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++ - Detect dangling references to temporary

Clang 3.9 extremely reuses memory used by temporaries. This code is UB (simplified code): template <class T> ... is NOT about code design. 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 query a constexpr std::tuple at compile time?

In C++0x, one can create a constexpr std::tuple, e.g. like #include <tuple> constexpr int i = 10; constexpr ... Thanks a lot in advance! - lars 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++ - Multiple mutex locking strategies and why libraries don't use address comparison

There is a widely known way of locking multiple locks, which relies on choosing fixed linear ordering and aquiring ... on a library level? 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++ - Convert std::vector to array

I have a library which expects a array and fills it. I would like to use a std::vector instead of using an array. ... if you do not use C++11! 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 redirect standard output to output window from Visual Studio

Is it possible to redirect standard output to the output window from Visual Studio? I use OutputDebugString in my ... printf's or cout's. 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 are arrays passed?

Are arrays passed by default by ref or value? 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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