Recent questions tagged C++

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c++ - Proper cleanup with a suspended coroutine

I'm wondering what the best (cleanest, hardest to mess up) method for cleanup is in this situation. void MyClass ... that it gets done cleanly. 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++ - Order of function calling

What will be the order the function calls in the following expression: a = f1(23, 14) * f2(12/4) + f3(); Does it depend on the compiler? 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++ - std::map::operator[]

I was doing a simple map program but ended up with this question. The c++ doc says this: Access element ... constructor? or what is happening? 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++ - error C3017: termination test in OpenMP 'for' statement has improper form

I have a for loop that has all variables defined #pragma omp parallel for for(long long l = 1; l<=sqrtt; l++) ... do I apply it to my for loop? 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++ - Doesnt stl sort require a strict weak ordering to work?

From http://stdcxx.apache.org/doc/stdlibref/less-equal.html -- You can pass a less_equal object to any ... is the documentation above correct ? 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++ - min and max in opencv

I have a huge amount of points data set. so i want to find min and max values from these points set. now i ... so plese any one help me. 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 doesn't the OS crash if I dereference a null pointer?

Dereferencing a null pointer results in undefined behavior. In practice it usually means that my program will crash ... of "undefined behavior"? 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++ - Weird evaluation order in chained functions

I have this code, which is used to build a graphic interface on a LCD display on a controller; the code ... whole stuff in multiple statements ? 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++ - Cant insert to std::map (G++)

I have a following trouble: struct ServerPP { std::string name; int id; int expires; }; std::map<std::string, ... ++, on windows all ok 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++ - GetDiskFreeSpaceEx reports wrong number of free bytes

__int64 i64FreeBytes unsigned __int64 lpFreeBytesAvailableToCaller, lpTotalNumberOfBytes, lpTotalNumberOfFreeBytes; // variables used ... ? 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++ - Null character in encrypted data

Is it possible that after cbc encryption, null character appears in the resulting multibyte data. If yes, what ... I take to avoid 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++ - Templated Function Pointer Arrays in Visual Studio

Guillaume Racicot gave an excellent answer to this question on how I could specialize template variables. But I'm ... do to work around 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++ - How to serialize and deserialize rich text in QTextEdit?

Say I have a structure like this: class AAA { BBB bb_member; double dbl_member; .................... } ... while calling out << AAA_object; ??? 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 select a member variable with a type parameter?

I have a cache object that caches a number of different types of objects, as illustrated below: class Cache { ... find a better way. 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++ - Moving inline methods from a header file to a .cpp files

I have the following class defined in a foo.h header file class Foo { public: inline int Method(); }; ... Thank you very much 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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666 views

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c++ - Logarithm of the very-very large number

I have to find log of very large number. I do this in C++ I have already made a function of ... big numbers, it will work correctly? 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 lambdification of a concept an improvement or bad practice?

It appears that you can put lambda in the concept and then write code in it. Let us take this as an ... practice? From readability point too. 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++ - Time complexity of an iterative algorithm

I am trying to find the Time Complexity of this algorithm. The iterative: algorithm produces all the bit-strings within a ... 15 vector a = 3 4 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::dynamic_properties and immutable graph object

after implementing some algorithm using the BGL, im trying to provide io functions using GraphML. However, i dont ... See here! Regards, Marti See Question&Answers more detail:os...

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

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670 views

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c++ - Handling UTF-8 encoded strings between std::wstring and std::string

I am using two libraries one that stores UTF-8 strings in std::wstring and another stores strings ( UTF-8 ... would prefer a portable 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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720 views

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c++ - gcc undefined reference to `std::ios_base::Init::Init()'

Write a boost test whether the installation was successful demo #include<iostream> #include<boost/lexical_cast.hpp> int ... ::exception()': 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++ - segmentation-fault with boost::polygon

I have got polygon-data which I processed. Now I want to see how well my processed data fits my original data. ... wrong? Thanks for your help! See Question&Answers more detail:os...

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

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628 views

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c++ - Static templated constexpr nested class member

I have the following sample class Foo with nested class Bar and everything is constexpr: class Foo { private: template ... into what's going on) See Question&Answers more detail:os...

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

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571 views

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c++ - gcov is not generating coverage information for header files

I'm using gcov for the first time and I'm having a problem which is similar to the one reported in this ... ? Sorry for the length. 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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727 views

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c++ - How to compile Box2D in Linux?

Compiling the Box2d Tesbed is supposed to be simple: from iforce2d: Download the Box2D source code archive from here. ... can this be done ? See Question&Answers more detail:os...

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

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807 views

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c++ - Conditional compilation and non-type template parameters

I am having trouble understanding non-type template arguments and was hoping someone could shed light on this ... something like 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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496 views

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c++ - Send data to a barcode scanner over RS232 serial port

I have a bar-code scanner which is connecting through RS232 serial port. I need to write a program to ... and suggestions are welcome. 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++ - Using SQLite custom functions with Qt

I'm trying to create a custom function for a SQLite database I'm using with Qt. I found information on how ... result is a segfault? 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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