Recent questions tagged C++

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c++ - At what point does memory allocated by malloc get a type?

This question asks what is the dynamic type of the object allocated by malloc and according to the top answer ... fact that it is uninitialized? 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++ - Couldn't deduce template parameter from function parameter's default argument

I'm trying to make a function which finds the minimum element in a range which satisfies a given condition: #include < ... and how can I fix 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++ - Object-Oriented Suicide or delete this;

The following code compiled with MSVC9.0 runs and outputs Destructor four times, which is logical. #include ... behavior (technically speaking)? 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++ - Template type deduction with std::function

I have discovered the following behaviour with std::function and type deduction, which was unexpected for me: #include ... a workaround for 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++ - What happens to the underlying storage upon vector's copy/move assignment?

For std::vector's copy assignment, is reallocation of storage and shrink of capacity allowed when the source's size is ... is out of the radar)? 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 convert char array to wchar_t array?

char cmd[40]; driver = FuncGetDrive(driver); sprintf_s(cmd, "%c:\test.exe", driver); I cannot use cmd ... convert char array to wchar_t 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++ - Include header path change from Windows to Linux

I'm porting an application written in C++ from Windows to Linux. I have a problem with the header files path. ... . Is there some work around? 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++0x Lambda to function pointer in VS 2010

I am trying to use a lambda to pass in place of a function pointer but VS2010 can't seem to convert it. ... return &Detail2<Signature>::Bind; } 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++ - cin and boolean input

I am new to C++ and I was wondering how the function cin in case of a boolean data works. Let's say ... string value to aSmile. What happened? 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++ - Behavior of decltype

Say I have an object of some of stl container classes obj. I can define other object of same type this way: ... Why? Am I doing something wrong? See Question&Answers more detail:os...

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

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480 views

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c++ - Compare two sets of types for equality

How can one check if two parameter packs are the same, ignoring their internal order? So far I only have the frame ... more than once in a set. 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 return different classes from one function?

I have a question, though it is not limited to C++. How to return totally different class from one function? ... class in one function? 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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217 views

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c++ - msvcr90d.dll not found in debug mode

I found MSVCR90D.dll not found in debug mode with Visual C++ 2008 question but none of given answers really ... within Visual Studio. Anyone? 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::spirit access position iterator from semantic actions

Lets say I have code like this (line numbers for reference): 1: 2:function FuncName_1 { 3: var Var_1 = 3; 4: var ... ----- "; } 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++ - How to stop doubles converting to scientific notation when using a stringstream

I'm making a function to return the number of decimal and whole number digits and am converting the inserted typename ... ; } return length; } See Question&Answers more detail:os...

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

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180 views

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c++ - Qt synchronization barrier?

Is there a Qt equivalent of a barrier for synchronization? The type where the first N-1 callers to wait block ... causes them all to release. See Question&Answers more detail:os...

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

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182 views

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c++ - template disambiguator

I'm trying to find any information about template keyword used as disambiguator, but there is nothing about that. ... link to standard). 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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534 views

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c++ - Parsing JSON string with jsoncpp

I'm trying to parse a JSON string encoded with PHP and sent over TCP to a C++ client. My JSON strings are ... understand what I'm doing wrong ? See Question&Answers more detail:os...

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

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299 views

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c++ - Why does decltype on a string literal not yield an array type?

The standard defines a string literal's type, in §2.13.5/8, as: Ordinary string literals and UTF-8 string ... false false What am I missing? 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 strings between hex format and binary format

Is there any utility or library provides a simple function to convert a string between hex/binary format? I've been ... it's available in 1.44. See Question&Answers more detail:os...

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

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117 views

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c++ - placement new + array +alignment

SomeObj<unsigned int>* Buffer; char* BufferPtr = MemoryManager::giveMeSomeBytes(resX*resY*sizeof(SomeObj<unsigned int>)) ... s going on? 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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204 views

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c++ - Erasing an element from a container while inside a range-based for loop

I want to erase an element from a container which is being currently used within a ranged-based for loop. ... someMap.erase(element.first); } 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++ - Missing Python.h while trying to compile a C extension module

I'm following this tutorial on how to extend Python with CC++ code. The section named "Building the extension module ... I do to solve 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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194 views

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c++ - Qt quncompress gzip data

I stumble upon a problem, and can't find a solution. So what I want to do is uncompress data in qt, ... are more then welcome. Best regards See Question&Answers more detail:os...

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

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471 views

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c++ - Can I initialize an array using the std::initializer_list instead of brace-enclosed initializer?

Can I initialize an array using the std::initializer_list object instead of brace-enclosed initializer? As known, ... to initialize an 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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176 views

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c++ - Generic function to flatten a container of containers

I am trying to get a better hold on iterators and generic functions. I thought it would be a useful exercise to ... don't know what to do. See Question&Answers more detail:os...

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

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340 views

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c++ - Syntax for specialization of nested template class

I'm trying to figure out the correct syntax for explicit specialization of a nested template class. The ... nested approach. Thanks, Shmuel See Question&Answers more detail:os...

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

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376 views

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c++ - FindFirstFile undocumented wildcard or bug?

MSDN says: HANDLE WINAPI FindFirstFile( LPCTSTR lpFileName, LPWIN32_FIND_DATA lpFindFileData ); lpFileName The directory or path ... issue. ..." See Question&Answers more detail:os...

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

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