is it possible to discern between these two methods? should one not mutate an rvalue when in this case seems perfectly reusable? TYPE a; TYPE b = -a; // unary operator- of a TYPE& aka lvalue ref TYPE c = -(a+b); // unary operator- of a TYPE&& aka rvalue ref Answer You can use reference … Read more
I am trying to convert a uint16_t input to a uint32_t bit mask. One bit in the input toggles two bits in the output bit mask. Here is an example converting a 4-bit input to an 8-bit bit mask: Input Output ABCDb -> AABB CCDDb A,B,C,D are individual bits Example outputs: 0000b -> 0000 0000b … Read more
If we have this example functions code in C++ void foo(int x) { std::cout << “foo(int)” << std::endl; } void foo(int& x) { std::cout << “foo(int &)” << std::endl; } Is it possible to difference what function to call doing any modification in the calling arguments? If the function foo is called in some of … Read more
The following code #include <initializer_list> #include <vector> template<int …> const std::vector<int>*make_from_ints(int args…) { return new std::vector<int>(std::initializer_list<int>{args}); } is compiling (with GCC 6.3, on Debian/Sid/x86-64) correctly, and I expect it for a call like auto vec = make_from_ints(1,2,3); to return a pointer to some vector of integers containing 1, 2, 3. However, if I replace int … Read more
I am struggling to install .NET Framework 3.5 on docker container. I have 4.5 installed already, but need 3.5 to run one Service. Here is my Dockerfile: FROM microsoft/windowsservercore SHELL [“powershell”] RUN Install-WindowsFeature NET-Framework-45-ASPNET ; \ Install-WindowsFeature Web-Asp-Net45 RUN dism /online /enable-feature /featurename:NetFX3 /all COPY Startup Startup COPY Service Service RUN “C:\Windows\Microsoft.NET\Framework\v4.0.30319\installutil.exe” WCS.WindowsService.exe RUN mkdir … Read more
I have a QML ListView which uses a QAbstractListModel subclass as a model. ListView { id: myListView x: 208 y: 19 width: 110 height: 160 delegate: myListDelegate {} model: MyListModel opacity: 0 } The model is a list of MyListItems. class MyListModel : public QAbstractListModel { Q_OBJECT public: enum MyRoles { HeadingRole = Qt::UserRole + … Read more
Probably I am missing something, but I do not understand why Encoding.UTF8.GetString and Encoding.UTF8.GetBytes are not working as inverse transformation of each other? In the following example the myOriginalBytes and asBytes are not equal, even their length is different. Could anyone explain what am I missing? byte[] myOriginalBytes = GetRandomByteArray(); var asString = Encoding.UTF8.GetString(myOriginalBytes); var … Read more
I want to debug an executable generated with Bazel. The gdb debugger is lost with the links generated by Bazel and is not able to show me the C++ source code. How to fix that? The project root directory is /home/…/Cpp/ ./Cpp/ ├── bazel-bin -> /home/picaud/.cache/bazel/_bazel_picaud… ├── bazel-Cpp -> /home/picaud/.cache/bazel/_bazel_picaud… ├── bazel-genfiles -> /home/picaud/.cache/bazel/_bazel_picaud… ├── … Read more
Can a relationship one-to-one be created only one way? public class Class1 { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Class1Id { get; set; } … } public class Class2 { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Class2Id { get; set; } public int? RelationshipId { get; set; } public virtual Class1 Relationship { get; set; } … } And … Read more
Assume I have an EF entity class Person, with a PhoneNumber on it. PhoneNumber is stored as a string type, but I want all accesses on the Person to go through Phone which has some nice accessor functions, e.g. validation or GetAreaCode(). I want to back it in the db as a string, but when … Read more
