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How to pass optional arguments to a method in C++?
... else
do_something_else();
}
you can call myfunc in both ways and both are valid
myfunc(10); // Mode will be set to default 0
myfunc(10, 1); // Mode will be set to 1
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impr...
Performance of Arrays vs. Lists
...u need to have a list/array of integers which you need iterate frequently, and I mean extremely often. The reasons may vary, but say it's in the heart of the inner most loop of a high volume processing.
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Can I call a base class's virtual function if I'm overriding it?
Say I have classes Foo and Bar set up like this:
7 Answers
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Is it possible to print a variable's type in standard C++?
... update to a very old question: Print variable type in C++.
The accepted (and good) answer is to use typeid(a).name(), where a is a variable name.
Now in C++11 we have decltype(x), which can turn an expression into a type. And decltype() comes with its own set of very interesting rules. For exam...
TypeError: unhashable type: 'dict'
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To convert the resulting frozenset back to dict, just call dict(the_frozenset).
– user
Oct 8 '18 at 21:47
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How to subtract date/time in JavaScript? [duplicate]
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You can use getTime() method to convert the Date to the number of milliseconds since January 1, 1970. Then you can easy do any arithmetic operations with the dates. Of course you can convert the number back to the Date with setTime(). See here an example.
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What's the best way to parse a JSON response from the requests library?
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response = requests.get(...)
json_data = json.loads(response.text)
This converts a given string into a dictionary which allows you to access your JSON data easily within your code.
Or you can use @Martijn's helpful suggestion, and the higher voted answer, response.json().
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Why use double indirection? or Why use pointers to pointers?
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Yes, and if you ever lose track of one of your pointers, here's a pointer: pointerpointer.com
– Andrew Cheong
Aug 21 at 0:50
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How do I sort a vector of pairs based on the second element of the pair?
...to your question, here's some thoughts ...
if you really wanna be creative and be able to reuse this concept a lot, just make a template:
template <class T1, class T2, class Pred = std::less<T2> >
struct sort_pair_second {
bool operator()(const std::pair<T1,T2>&left, const...
How do I determine the size of my array in C?
...ith the type, like this:
int a[17];
size_t n = sizeof(a) / sizeof(int);
and get the proper answer (68 / 4 = 17), but if the type of
a changed you would have a nasty bug if you forgot to change
the sizeof(int) as well.
So the preferred divisor is sizeof(a[0]) or the equivalent sizeof(*a), the siz...