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What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
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In the above answers, it is important to understand what is meant by "values are expanded at declaration/use time". Giving a value like *.c does not entail any expansion. It is only when this string is used by a command that it will maybe trigger some globbing. Similarly, a value like $(wil...
Is it a good practice to place C++ definitions in header files?
...e merit to putting code in the header, this can allow more clever inlining by the compiler. But at the same time, it can destroy your compile times since all code has to be processed every time it is included by the compiler.
Finally, it is often annoying to have circular object relationships (some...
How do I wrap link_to around some html ruby code?
...ink around view code? I can't figure out how to pass multiple lines with ruby code to a single link_to method. The result I am looking for is that you click the column and get the show page:
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MySQL: Set user variable from result of query
...Without using keyword 'SET' and using ':='.
Example:-
mysql > @a:=1;
By using 'SELECT' statement.
Example:-
mysql > select 1 into @a;
Here @a is user defined variable and 1 is going to be assigned in @a.
Now how to get or select the value of @{variable_name}.
we can use select statement l...
Is effective C++ still effective?
...only code. The Effective C++ is still very relevant, and is not superseded by the new book. Buy it, read it, enjoy :)
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MongoDB: Combine data from multiple collections into one..how?
...is real-time, you can run map-reduce multiple times to merge data together by using the "reduce" out option in MongoDB 1.8+ map/reduce (see http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Outputoptions). You need to have some key in both collections that you can use as an _id.
For example,...
Python TypeError: not enough arguments for format string
... for the logging module as well? Is this kind of interpolation understood by it?
– AllTradesJack
Aug 20 '14 at 18:35
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“unary operator expected” error in Bash if condition
...unts to two processes ("[" is actually a program) instead of one.
It goes by this syntax: ${VARIABLE:-default}.
The whole thing has to be thought in such a way that this "default" value is something distinct from a "valid" value/content.
If that's not possible for some reason you probably need to...
Escape double quotes in a string
...he extra " characters are part of the string literal; they are interpreted by the compiler as a single ".
The actual value of your string is still He said to me , "Hello World".How are you ?, as you'll see if you print it at runtime.
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Recursively remove files
... point. Wouldn't command rm be a better (that is, more direct) solution? (By "direct" I mean it deals specifically with the problem at hand and nothing else, and therefore is less likely to have any unwanted side-effects, and is also going to be more self-explanatory to anyone who has to maintain t...