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Create a new object from type parameter in generic class
... This is a WRONG answer, even in JavaScript. If you have a class Foo{ method() { return true; }, casting {} to T will not give you this method!
– JCKödel
Apr 26 '19 at 16:12
...
Best practices for SQL varchar column length [closed]
...).
-- try to create a table with max varchar length
drop table if exists foo;
create table foo(name varchar(65535) not null)engine=innodb;
MySQL Database Error: Row size too large.
-- try to create a table with max varchar length - 2 bytes for the length
drop table if exists foo;
create table fo...
Difference in make_shared and normal shared_ptr in C++
...ssary for both the control block and the data. In the other case, new Obj("foo") invokes a heap-allocation for the managed data and the std::shared_ptr constructor performs another one for the control block.
For further information, check out the implementation notes at cppreference.
Update I: Exc...
How do arrays in C# partially implement IList?
...ce implementation.
Here's a simple standalone example:
public interface IFoo
{
void M1();
void M2();
}
public class Foo : IFoo
{
// Explicit interface implementation
void IFoo.M1() {}
// Implicit interface implementation
public void M2() {}
}
class Test
{
static ...
Calling class staticmethod within the class body?
... and find that out (a C&P from my Python session):
>>> class Foo(object):
... @staticmethod
... def foo():
... return 3
... global z
... z = foo
>>> z
<staticmethod object at 0x0000000002E40558>
>>> Foo.foo
<function foo at 0x00000000...
Java: How to test methods that call System.exit()?
... void CallsExit(ExitManager exitManager) {
// whatever
if (foo) {
exitManager.exit(42);
}
// whatever
}
}
The production code uses the ExitManagerImpl and the test code uses ExitManagerMock and can check if exit() was called and with which exit code....
Why does instanceof return false for some literals?
...h code, perhaps it's not possible. This is probably why people use typeof "foo" === "string" instead of instanceof.
An easy way to remember things like this is asking yourself "I wonder what would be sane and easy to learn"? Whatever the answer is, Javascript does the other thing.
...
Difference between abstraction and encapsulation?
...rmation hiding.
Abstraction:-- Implementation hiding.
Example:
class foo{
private:
int a, b;
public:
foo(int x=0, int y=0): a(x), b(y) {}
int add(){
return a+b;
}
}
Internal representation of any object of foo class is hidden out...
Replace whole line containing a string using Sed
...:
sed -i '/TEXT_TO_BE_REPLACED/c\This line is removed by the admin.' /tmp/foo
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What's the @ in front of a string in C#?
.... It means that escaping isn't applied. For instance:
string verbatim = @"foo\bar";
string regular = "foo\\bar";
Here verbatim and regular have the same contents.
It also allows multi-line contents - which can be very handy for SQL:
string select = @"
SELECT Foo
FROM Bar
WHERE Name='Baz'";
Th...