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How to sum up elements of a C++ vector?
...
Actually there are quite a few methods.
int sum_of_elems = 0;
C++03
Classic for loop:
for(std::vector<int>::iterator it = vector.begin(); it != vector.end(); ++it)
sum_of_elems += *it;
Using a standard algorithm:
#include <numeric>
sum_of_elems...
How to enable C++11 in Qt Creator?
... that web page). It requires Qt 5.
The other answers, suggesting
QMAKE_CXXFLAGS += -std=c++11 (or QMAKE_CXXFLAGS += -std=c++0x)
also work with Qt 4.8 and gcc / clang.
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Calculating how many minutes there are between two times
... Yes TotalMinutes is what i was looking for. Thank you very much ^_^
– Wahid Bitar
Mar 28 '16 at 19:34
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How can I remove a key and its value from an associative array?
...ample:
$array = array("key1" => "value1", "key2" => "value2");
print_r($array);
unset($array['key1']);
print_r($array);
unset($array['key2']);
print_r($array);
Output:
Array
(
[key1] => value1
[key2] => value2
)
Array
(
[key2] => value2
)
Array
(
)
...
Convert xlsx to csv in Linux with command line
...dsheet formats:
$ ssconvert Book1.xlsx newfile.csv
Using exporter Gnumeric_stf:stf_csv
$ cat newfile.csv
Foo,Bar,Baz
1,2,3
123.6,7.89,
2012/05/14,,
The,last,Line
To install on Ubuntu:
apt-get install gnumeric
To install on Mac:
brew install gnumeric
...
Rails.env vs RAILS_ENV
...
According to the docs, #Rails.env wraps RAILS_ENV:
# File vendor/rails/railties/lib/initializer.rb, line 55
def env
@_env ||= ActiveSupport::StringInquirer.new(RAILS_ENV)
end
But, look at specifically how it's wrapped, using ActiveSupport::String...
How to do a batch insert in MySQL
... within
parentheses and separated by commas.
Example:
INSERT INTO tbl_name (a,b,c) VALUES(1,2,3),(4,5,6),(7,8,9);
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How do you serve a file for download with AngularJS or Javascript?
...
Try this
<a target="_self" href="mysite.com/uploads/ahlem.pdf" download="foo.pdf">
and visit this site it could be helpful for you :)
http://docs.angularjs.org/guide/
...
Best way to check if a Data Table has a null value in it
...
I will do like....
(!DBNull.Value.Equals(dataSet.Tables[6].Rows[0]["_id"]))
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How to check if a value exists in an array in Ruby
... as pointed out by @campaterson. So within Rails, or if you require 'active_support', you can write:
'Unicorn'.in?(['Cat', 'Dog', 'Bird']) # => false
OTOH, there is no in operator or #in? method in Ruby itself, even though it has been proposed before, in particular by Yusuke Endoh a top notch ...