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What is a C++ delegate?
... {
return (int) d + 1;
}
};
// Use:
Functor f;
int i = f(3.14);
Option 2: lambda expressions (C++11 only)
// Syntax is roughly: [capture](parameter list) -> return type {block}
// Some shortcuts exist
auto func = [](int i) -> double { return 2*i/1.15; };
double d = func(...
How does Python manage int and long?
...ns back. Before that it was possible to overflow an int through math ops.
3.x has further advanced this by eliminating long altogether and only having int.
Python 2: sys.maxint contains the maximum value a Python int can hold.
On a 64-bit Python 2.7, the size is 24 bytes. Check with sys.getsize...
Checking if a field contains a string
...
730
You can do it with the following code.
db.users.findOne({"username" : {$regex : ".*son.*"}});
...
Why should I prefer to use member initialization lists?
...) { x = x_; }
int x;
};
class B
{
public:
B()
{
a.x = 3;
}
private:
A a;
};
In this case, the constructor for B will call the default constructor for A, and then initialize a.x to 3. A better way would be for B's constructor to directly call A's constructor in the ini...
How to use relative/absolute paths in css URLs?
...
3 Answers
3
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Print multiple arguments in Python
..._future__ import print_function
Use the new f-string formatting in Python 3.6:
print(f'Total score for {name} is {score}')
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How to get the parents of a Python class?
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answered Apr 10 '10 at 1:35
Ayman HouriehAyman Hourieh
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What's the difference between Task.Start/Wait and Async/Await?
...
398
I may be missing something
You are.
what is the difference between doing Task.Wait a...
Is it possible to make abstract classes in Python?
...ct using one of three ways, depending upon your Python version.
In Python 3.4 and above, you can inherit from ABC. In earlier versions of Python, you need to specify your class's metaclass as ABCMeta. Specifying the metaclass has different syntax in Python 3 and Python 2. The three possibilities ar...
Confusion: @NotNull vs. @Column(nullable = false) with JPA and Hibernate
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330
@NotNull is a JSR 303 Bean Validation annotation. It has nothing to do with database constrain...