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C++11 rvalues and move semantics confusion (return statement)
...tor<int> return_vector(void)
{
std::vector<int> tmp {1,2,3,4,5};
return tmp;
}
std::vector<int> &&rval_ref = return_vector();
The first example returns a temporary which is caught by rval_ref. That temporary will have its life extended beyond the rval_ref definiti...
Stop setInterval call in JavaScript
...
2224
setInterval() returns an interval ID, which you can pass to clearInterval():
var refreshInterva...
What's the function like sum() but for multiplication? product()?
... return reduce(operator.mul, iterable, 1)
>>> prod(range(1, 5))
24
Note, in Python 3, the reduce() function was moved to the functools module.
Specific case: Factorials
As a side note, the primary motivating use case for prod() is to compute factorials. We already have support for that i...
How can jQuery deferred be used?
...|
edited Dec 28 '16 at 15:44
Cœur
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answere...
Is it possible to use JS to open an HTML select to show its option list? [duplicate]
...
GarethGareth
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19
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How can I detect if a browser is blocking a popup?
...
edited Feb 22 '18 at 16:54
Dez
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answered Aug 5 '...
Using boolean values in C
... true } bool;
Option 3
typedef int bool;
enum { false, true };
Option 4
typedef int bool;
#define true 1
#define false 0
Explanation
Option 1 will work only if you use C99 and it's the "standard way" to do it. Choose this if possible.
Options 2, 3 and 4 will have in practice the same ident...
Retain precision with double in Java
...se the BigDecimal class, if you want to have an exact representation of 11.4.
Now, a little explanation into why this is happening:
The float and double primitive types in Java are floating point numbers, where the number is stored as a binary representation of a fraction and a exponent.
More spe...
Filtering Pandas DataFrames on dates
...based indexing or .iloc for positional indexing.
For example:
df.loc['2014-01-01':'2014-02-01']
See details here http://pandas.pydata.org/pandas-docs/stable/dsintro.html#indexing-selection
If the column is not the index you have two choices:
Make it the index (either temporarily or permanentl...
Get table names using SELECT statement in MySQL
... |
edited Aug 29 '19 at 14:55
Kohjah Breese
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ans...