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How to determine the version of the C++ standard used by the compiler?
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From the Bjarne Stroustrup C++0x FAQ:
__cplusplus
In C++0x the macro __cplusplus will be set to a value that differs
from (is greater than) the current 199711L.
Although this isn't as helpful as one would like. gcc (apparently for nearly 10 years)...
Serialize Class containing Dictionary member
...'t serialize a class that implements IDictionary. Check out this link.
Q: Why can't I serialize hashtables?
A: The XmlSerializer cannot process
classes implementing the IDictionary
interface. This was partly due to
schedule constraints and partly due to
the fact that a hashtable doe...
Query for documents where array size is greater than 1
...);
It will be better solution, and will work much faster (you can create index on it).
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Does MySQL ignore null values on unique constraints?
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note: this also works also unique indexes that have more columns. So if you want columns a, b and c to be unique you can still have in the table double rows with null, b, c
– Mihai Crăiță
Oct 13 '19 at 8:39
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Serialize form data to JSON [duplicate]
...re's a function for this use case:
function getFormData($form){
var unindexed_array = $form.serializeArray();
var indexed_array = {};
$.map(unindexed_array, function(n, i){
indexed_array[n['name']] = n['value'];
});
return indexed_array;
}
Usage:
var $form = $("#for...
Creating a copy of a database in PostgreSQL [closed]
...reate database dialog but you should be able to execute the following in a query window if it doesn't:
CREATE DATABASE newdb WITH TEMPLATE originaldb OWNER dbuser;
Still, you may get:
ERROR: source database "originaldb" is being accessed by other users
To disconnect all other users from the d...
Open URL under cursor in Vim with browser
...word = expand("<cword>")
let url = "http://www.google.com/search?q=" . keyword
let path = "C:/Program Files/Mozilla Firefox/"
exec 'silent !"' . path . 'firefox.exe" ' . url
endfun
You should use getline('.') and matchstr() to extract url under cursor. The rest is the same.
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Creating dataframe from a dictionary where entries have different lengths
...np.array([1,2,3,4]) )
In[21]: df = pd.DataFrame.from_dict(my_dict, orient='index')
In[22]: df
Out[22]:
0 1 2 3
A 1 2 NaN NaN
B 1 2 3 4
In[23]: df.transpose()
Out[23]:
A B
0 1 1
1 2 2
2 NaN 3
3 NaN 4
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how to calculate binary search complexity
... The first time value of N would be equal to (L + H), where L is the first index (0) and H is the last index of the list you are searching for. If you are lucky, the element you try to find will be in the middle [eg. You are searching for 18 in the list {16, 17, 18, 19, 20} then you calculate ⌊...
How can I add a help method to a shell script?
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@sigur, make sure you quote "$usage" every place you use it.
– glenn jackman
Dec 24 '16 at 15:10
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