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Memory management in Qt?
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If one class somewhere in the inheritance tree has a virtual destructor, every child class below will have a virtual destructor. Now, if there is a leaf parent class outside such a virtual destructor chain without a virtual dest...
What is the preferred/idiomatic way to insert into a map?
... be of interest (most notably to determine if insertion has actually been done).
From all the listed possibilities to call insert, all three are almost equivalent. As a reminder, let's have look at insert signature in the standard :
typedef pair<const Key, T> value_type;
/* ... */
pair&...
When to use the different log levels
...tion:
Trace - Only when I would be "tracing" the code and trying to find one part of a function specifically.
Debug - Information that is diagnostically helpful to people more than just developers (IT, sysadmins, etc.).
Info - Generally useful information to log (service start/stop, configuration ...
Understanding Fragment's setRetainInstance(boolean)
...please confirm the following: Even though setRetainInstance(true) is used, one still has to implement their own persistence (savedInstanceState or otherwise) to be able to handle all scenarios: e.g. "home key, rotate, back to app" recreates my fragment with constructor call, losing all state variabl...
No == operator found while comparing structs in C++
...ring vs. using extra memory to sort temporaries each time a comparison is done
how many array elements currently hold valid values that should be compared (is there a size somewhere or a sentinel?)
which member of a union to compare
normalisation: for example, date types may allow out-of-range day-o...
Re-raise exception with a different type and message, preserving existing information
...ion? I regret that I gave such a godawful answer, but it's weird that this one got accepted.
– Devin Jeanpierre
Apr 4 '11 at 6:52
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How to set tbody height with overflow scroll
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GCyrillus : you are closest. But there is one issue. table width went too high. Can we fix table width?
– Maverick
Jun 2 '14 at 8:19
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What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
... with all the possible datatypes which imply similar contents, so could anyone tell me the difference between the following data-types?
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Why use symbols as hash keys in Ruby?
...it's separate entity, e.g. if you have a string "name" multiple times mentioned in your source code, Ruby needs to store these all in separate String objects, because they might change later on (that's the nature of a Ruby string).
If you use a string as a Hash key, Ruby needs to evaluate the strin...
Rename specific column(s) in pandas
I've got a dataframe called data . How would I rename the only one column header? For example gdp to log(gdp) ?
5 Answe...