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Why does the C++ map type argument require an empty constructor when using []?
..., among other things, they should be default-constructible.
Without this (and others requirements) it would be needlessly hard to implement the various internal copy/move/swap/compare operations on the data structures with which STL containers are implemented.
Upon reference to the C++ Standard, ...
How to increment datetime by custom months in python without using library [duplicate]
...time.date(2010, 11, 30)
Also, if you're not worried about hours, minutes and seconds you could use date rather than datetime. If you are worried about hours, minutes and seconds you need to modify my code to use datetime and copy hours, minutes and seconds from the source to the result.
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jQuery Event Keypress: Which key was pressed?
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@Marcel: Yes, jQuery's key handling has shortcomings and that is an unfortunate example, but for the Enter key, which is what this question is asking about, the situation is extremely simple.
– Tim Down
Jan 25 '11 ...
When 1 px border is added to div, Div size increases, Don't want to do that
...d), under the html->layout tab.
Just as an example, a div with a width and height of 10px and a border of 1px, will have an outer width and height of 12px.
For your case, to make it appear like the border is on the "inside" of the div, in your selected CSS class, you can reduce the width and he...
How can I check if multiplying two numbers in Java will cause an overflow?
I want to handle the special case where multiplying two numbers together causes an overflow. The code looks something like this:
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Why avoid increment (“++”) and decrement (“--”) operators in JavaScript?
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My view is to always use ++ and -- by themselves on a single line, as in:
i++;
array[i] = foo;
instead of
array[++i] = foo;
Anything beyond that can be confusing to some programmers and is just not worth it in my view. For loops are an exception,...
Insert into … values ( SELECT … FROM … )
... the SQL engine of the day ( MySQL , Oracle , SQL Server , Informix , and DB2 ).
26 Answers
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Database design for a survey [closed]
...estions. For example: text fields for comments, multiple choice questions, and possibly questions that could contain more than one answer (i.e. check all that apply).
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Java synchronized static methods: lock on object or class
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Please answer Elaborate so that everyone can understand.
– Madhu
Sep 2 '09 at 4:49
6
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“unpacking” a tuple to call a matching function pointer
.... doesn't work from the signatures: your std::make_unique expects a tuple, and a tuple can be created from an unpacked tuple only via another call to std::make_tuple. This is what I've done in the lambda (although it's highly redundant, as you can also simply copy the tuple into the unique pointer w...