Recent questions tagged C++

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c++ - Undefined reference to a static member of the class

I am working on a homework assignment, and I have almost everything done except for this obnoxious static value ... Class1::value is private See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - QSqlDatabase: QMYSQL driver not loaded on Ubuntu 15.04 64bits

In Ubuntu 15.04 64 bits I installed Qt5.6 (online installer) and while trying to move my development environment ... ? How should I proceed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Are the "usual arithmetic conversions" and the "integer promotions" the same thing?

Are the "usual arithmetic conversions" and the "integer promotions" the same thing? I have read that the ... usual arithmetic conversions" only. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When should I use the keyword "typename" when using templates

I've been working lately on a small project, and I couldn't figure out something.. I've been given a .h ... a template? Thanks for your time. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Aligning static string literals

I have a static array of structures: struct CommandStruct { char* data; unsigned ans_size; }; static const ... a single block of code. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calculating the info-hash of a torrent file

I'm using C++ to parse the info hash of a torrent file, and I am having trouble getting a "correct" ... parse this as hex first or something? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Visual Studio debug iterators

What is the relation between _SECURE_SCL and _HAS_ITERATOR_DEBUGGING. Is it possible to turn on/off range checking ... 2008 and 2010 versions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - unique_ptr and OpenSSL's STACK_OF(X509)*

I use some using statements and unique_ptr to work with OpenSSL, as suggested in another question. Without, code ... OpenSSL's STACK_OF(X509)*? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What happens when you bit shift beyond the end of a variable?

If you have some variable (on the stack) and you left or right bit shift beyond its end what happens? i.e. byte x = 1; ... ; *x = 1; *x >> N; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using << operator to write to both a file and cout

I'd like to overload << operator to write the value it takes to a file and cout. I have tried to do it with ... !!" << endl; return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Dependent name resolution & namespace std / Standard Library

While answering this SO question (better read this "duplicate"), I came up with the following solution to ... of the custom operator>>. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Print 2-D Array in clockwise expanding spiral from center

I have an guaranteed to be a perfect square matrix. I want to start at the center of the matrix in this case it ... 18 19 20 21 22 23 24 25 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to include data object files (images, etc.) in program and access the symbols?

I've turned a couple of resource files into .obj files using objcopy and i link them with my programs ... get unresolved symbol link errors. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Question about pure virtual destructor

If we define a abstract class which has a pure virtual destructor, why do we have to give a definition of a destructor in the abstract class? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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605 views

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c++ - How to parse csv using boost::spirit

I have this csv line std::string s = R"(1997,Ford,E350,"ac, abs, moon","some "rusty" parts",3000.00)"; ... abs, moon some "rusty" parts 3000.00 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

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c++ - Memory allocation and deallocation across dll boundaries

I understand that memory allocations made in one dll then subsequently free'd in another can cause all sort of ... we can solve this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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638 views

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c++ - CPack: Exclude INSTALL commands from subdirectory (googletest directory)

I'm using CMake for a project and googletest for my test cases. Looking around the internet, it seems to ... disable these installs in CPack? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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823 views

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c++ - Deduction guides and variadic class templates with variadic template constructors - mismatched argument pack lengths

Consider the following class definition and deduction guide: template <typename... Ts> struct foo : Ts... { template ... Is my code ill-formed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How bad is redefining/shadowing a local variable?

While upgrading a legacy project to VS2015, I noticed there were a lot of errors where a local variable was redefined ... is low or no risk? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - C++11 range based loop: How does it really work

I know how this loop works, and how I can use it in practical problems. But I want to know what is ... iteration the x value is different? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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558 views

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c++ - gcc can compile a variadic template while clang cannot

I'm reading some slides named An Overview of C++11 and C++14 presented by Mr. Leor Zolman. At Page 35 he introduces a ... of c++11 or c++14)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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576 views

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c++ - Compare equality of char[] in C

I have two variables: char charTime[] = "TIME"; char buf[] = "SOMETHINGELSE"; I want to check if these two are ... be different in C and C++? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Ordering of using namespace std; and includes?

I recently saw this code being used in a source file in a C++ project: using namespace std; #include < ... , that would be most appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Deleted Function in std::pair when using a unique_ptr inside a map

I have a piece of C++ code for which I am not sure whether it is correct or not. Consider the following ... Or is the second one also wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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405 views

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c++ - When pass a variable to a function, why the function only gets a duplicate of the variable?

When pass a variable to a function, why the function only gets a copy/duplicate of the variable? int n=1; ... off with convenience. Am I right? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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649 views

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c++ - Pointer array and sizeof confusion

Why does the following code output 4? char** pointer = new char*[1]; std::cout << sizeof(pointer) << " " ... should have length 1, shouldn't it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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694 views

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c++ - How to initialize the reference member variable of a class?

Consider the following code C++: #include<iostream> using namespace std; class Test { int &t; public: ... directly call the Constructor? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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550 views

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c++ - Unordered set of pairs, compilation error

I am trying to create an unordered set of pairs So far I have : typedef std::pair<int, int> Move; typedef ... ) http://fixee.org/paste/528pvoq/ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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