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Enum “Inheritance”
...
You can achieve what you want with classes:
public class Base
{
public const int A = 1;
public const int B = 2;
public const int C = 3;
}
public class Consume : Base
{
public const int D = 4;
public const int E = 5;
}
Now you can use these classes similar as w...
What are the rules for calling the superclass constructor?
...
Base class constructors are automatically called for you if they have no argument. If you want to call a superclass constructor with an argument, you must use the subclass's constructor initialization list. Unlike Java, C++...
How do I copy directories recursively with gulp?
...more appropriate but I'd be happy to look at how it works compared to the {base:"."} method.
– M1ke
Mar 26 '15 at 10:08
2
...
Adding header for HttpURLConnection
...redentials = "username:password";
String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userCredentials.getBytes()));
myURLConnection.setRequestProperty ("Authorization", basicAuth);
myURLConnection.setRequestMethod("POST");
myURLConnection.setRequestProperty("Content-Type", "applicat...
How to generate a git patch for a specific commit?
... commit, you can use the new git 2.9 (June 2016) option git format-patch --base
git format-patch --base=COMMIT_VALUE~ -M -C COMMIT_VALUE~..COMMIT_VALUE
# or
git format-patch --base=auto -M -C COMMIT_VALUE~..COMMIT_VALUE
# or
git config format.useAutoBase true
git format-patch -M -C COMMIT_VALUE~....
How can I make my own base image for Docker?
... Docker documentation , to build your own image, you must always specify a base image using the FROM instruction.
5 Answe...
Where do “pure virtual function call” crashes come from?
...bject hasn't been constructed or has already been destroyed), it calls the base class version, which in the case of a pure virtual function, doesn't exist.
(See live demo here)
class Base
{
public:
Base() { doIt(); } // DON'T DO THIS
virtual void doIt() = 0;
};
void Base::doIt()
{
s...
error: cannot dynamic_cast ‘b’ (of type ‘class Base*’) to type ‘c...
error: cannot dynamic_cast ‘b’ (of type ‘class Base*’) to type ‘class Derived*’ (source type is not polymorphic)在将父类型转换为子类型时,可以使用static_cast和dynamic_cast.如果使用dynamic_cast,它要求父类必须为多态的,即要求至少有一个虚函数,因此....
How do I change the background color of a plot made with ggplot2
...ement_rect(fill='green', colour='red'))
To define your own custom theme, based on theme_gray but with some of your changes and a few added extras including control of gridline colour/size (more options available to play with at ggplot2.org):
theme_jack <- function (base_size = 12, base_family ...
Why does the indexing start with zero in 'C'?
...e decision taken by the language specification & compiler-designers is based on the
decision made by computer system-designers to start count at 0.
The probable reason
Quoting from a Plea for Peace by Danny Cohen.
IEEE Link
IEN-137
For any base b, the first b^N
non-negative integers are rep...