Recent questions tagged c++

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c++ - Exported project template in VS2017 misses source files

When I use the Project -> Export template option in Visual Studio 2017, the resulting ZIP file includes the main ... an update at some point. 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++ - cross platform macro for silencing unused variables warning

In porting a large piece of C++ code from Visual Studio (2008) to Xcode (4.4+), I encounter lines such as ... to work. Did I miss anything? 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++ - Can the type of a base class be obtained from a template type automatically?

I am trying to use template meta-programming to determine the base class. Is there a way to get the base ... and would fail for private bases. 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++ - Compare between a char in a string to a given char

I have the following: int findPar(char* str) { int counter=0; while (*str) { if(str[0] == "(") <---- ... should) be correct. how should i do 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++ - How-to use Clang Static Analyzer on Windows?

I'm currently trying to integrate the Clang Static Analyzer v9.0.1 into my CMake v3.16.5 build system using ... 50Z Add mention of clang-tidy. 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 do I solve these libcurl linking errors?

[Administrator@windows ~]$ g++ client.cpp -lcurl -o client.exe C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp: ... a static version of 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++ - A-star algorithm

I'm having issues with my A-star implemention. It does find path from my point A to B but not if the terrain is ... } cin.get(); 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++ - Are std::move and std::copy identical?

I tried to do something like: std::copy(std::make_move_iterator(s1.begin()), std::make_move_iterator(s1.end()), std:: ... ::cout << s2.data; } 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 hardcode float precise if it can be represented by binary format in IEEE 754?

for example, 0 , 0.5, 0.15625 , 1 , 2 , 3... are values converted from IEEE 754. Are their hardcode version ... - 0.125), is the value precise? 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++ - Implementing a "string pool" that is guaranteed not to move

I need a "string pool" object into which I can repeatedly insert a "sequence of chars" (I use this ... string or null-terminated char 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++ - Load multiple copies of dll in same process

I have a dll produced by a third party that has some sort of internal datastructure that limits it's size to X ... load a native c++ dll. See Question&Answers more detail:os...

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

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400 views

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c++ - How to write qHash for a QSet<SomeClass*> container?

I need to implement a set of sets in my application. Using QSet with a custom class requires providing a qHash() ... *>) will be unique enough? 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 a default constructor is needed using unordered_map and tuple?

In the program below, I store some information in an hash table (std::unordered_map), the key is an object of the ... >second) << 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++ - string conversion with boost locale: different behaviour on windows and linux

This is my sample code: #pragma execution_character_set("utf-8") #include <boost/locale.hpp> #include <boost/ ... advance for your support! 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++ - Avoiding temporary when using boost::optional

boost::optional support in_place construction like so: #include <boost/optional.hpp> #include <boost/utility/ ... ,3); 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++ - return pointer to data declared in function

I know this won'T work because the variable x gets destroyed when the function returns: int* myFunction() { int x = 4; ... this - in C and 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++ - How to check if a template parameter is an iterator type or not?

template<class T> struct is_iterator { static const bool value = ??? // What to write ??? }; int main ... make the five assert statements pass? 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++ - In C++11, when are a lambda expression's bound variables supposed to be captured-by-value?

I have a Visual Studio 2010 C++ program, the main function of which is: vector<double> v( ... transparency for functional programming? 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++ - Zero-length C-array binds to pointer type

I recently wrote a function template which takes a reference to a C-array: template <class T, size_t N> ... why this behavior is necessary? 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++ - AVX log intrinsics (_mm256_log_ps) missing in g++-4.8?

I am trying to utilise some AVX intrinsics in my code and have run into a brick wall with the logarithm intrinsics ... the Intel SVML for ICC. 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 send artificial QKeyEvent to QWebEngineView?

Context: I'm creating a small web browser with a custom on-screen keyboard. It was working almost fine with Qt ... I find this too dirty 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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395 views

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c++ - cin.clear() doesn't reset cin object

I have the following loop. It should read numbers until EndOfFile, or the user input -999 int arr[100]; ... the error state or stopping. 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++ - deducing references to const from rvalue arguments

Okay, this may seem like a silly question, but here it goes: template <typename T> void foo(T& x) { } ... template with T = const int instead? 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++ - Using a prebuilt shared Library in Android Studio (cmake)

I want to use a C++ shared library inside my Android App. I tried to follow along the hello-libs example from ... the one on my local maschine. 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++ - Exception handling in Boost.Asio

Boost.Asio documentation suggests the following exception handling pattern: boost::asio::io_service io_service; ... for ... in try/catch blocks? 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++ - Purpose of uppercase VOID macro & INT typedef in winnt.h

Anyone any clue as to why there is an uppercase VOID macro defined in the winnt.h header? To make matters ... library/bb205867(v=vs.85).aspx See Question&Answers more detail:os...

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

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365 views

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c++ - QWidget on Mac OS X not focusing in Qt 5.x

I have QSystemTrayIcon with QAction that opens new window of type QWebView. When the window loses focus and I ... there any known workaround? See Question&Answers more detail:os...

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

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401 views

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c++ - Rcpp NumericMatrix - how to erase a row / column?

A novice question as I learn the Rcpp classes / data structures: Is there a member function to erase a row / column for ... ; } } return x2; }') See Question&Answers more detail:os...

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

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