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What is the difference between assert, expect and should in Chai?
...upport custom messages just about everywhere. For instance:
assert.isTrue(foo, "foo should be true");
expect(foo, "foo should be true").to.be.true;
The message "foo should be true" will be output together with the failed assertion if the assertion fails. You don't get the opportunity to set a cus...
How can I select multiple columns from a subquery (in SQL Server) that should have one record (selec
...rom a subquery:
SELECT
A.SalesOrderID,
A.OrderDate,
SQ.Max_Foo,
SQ.Max_Foo2
FROM
A
LEFT OUTER JOIN
(
SELECT
B.SalesOrderID,
MAX(B.Foo) AS Max_Foo,
MAX(B.Foo2) AS Max_Foo2
FROM
B
GROUP BY
B.SalesOrderID
...
std::unique_ptr with an incomplete type won't compile
...If you use pimpl with unique_ptr, you need to declare a destructor:
class foo
{
class impl;
std::unique_ptr<impl> impl_;
public:
foo(); // You may need a def. constructor to be defined elsewhere
~foo(); // Implement (with {}, or with = default;) where impl is complete
};
...
What is the difference between the dot (.) operator and -> in C++? [duplicate]
...
foo->bar() is the same as (*foo).bar().
The parenthesizes above are necessary because of the binding strength of the * and . operators.
*foo.bar() wouldn't work because Dot (.) operator is evaluated first (see operator...
Is there a difference between foo(void) and foo() in C++ or C?
...
In C:
void foo() means "a function foo taking an unspecified number of arguments of unspecified type"
void foo(void) means "a function foo taking no arguments"
In C++:
void foo() means "a function foo taking no arguments"
void...
How to load all modules in a folder?
...
Update in 2017: you probably want to use importlib instead.
Make the Foo directory a package by adding an __init__.py. In that __init__.py add:
import bar
import eggs
import spam
Since you want it dynamic (which may or may not be a good idea), list all py-files with list dir and import them...
Django REST Framework: adding additional field to ModelSerializer
...
I think SerializerMethodField is what you're looking for:
class FooSerializer(serializers.ModelSerializer):
my_field = serializers.SerializerMethodField('is_named_bar')
def is_named_bar(self, foo):
return foo.name == "bar"
class Meta:
model = Foo
fields = ('id', 'na...
Callback functions in C++
...rguably the worst) type a callback can have.
Let's have a simple function foo:
int foo (int x) { return 2+x; }
1.1 Writing a function pointer / type notation
A function pointer type has the notation
return_type (*)(parameter_type_1, parameter_type_2, parameter_type_3)
// i.e. a pointer to foo...
Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
...ay.
The fundamental reason why all of these work is that a function (like foo) is implicitly convertible to a pointer to the function. This is why void (*p1_foo)() = foo; works: foo is implicitly converted into a pointer to itself and that pointer is assigned to p1_foo.
The unary &, when app...
Calling C/C++ from Python?
...e you have a simple C++ example class you want to talk to in a file called foo.cpp:
#include <iostream>
class Foo{
public:
void bar(){
std::cout << "Hello" << std::endl;
}
};
Since ctypes can only talk to C functions, you need to provide those de...