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What are libtool's .la file for?
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It allows libtool to create platform-independent names.
For example, libfoo goes to:
Under Linux:
/lib/libfoo.so # Symlink to shared object
/lib/libfoo.so.1 # Symlink to shared object
/lib/libfoo.so.1.0.1 # Shared object
/lib/libfoo.a # Static library
/lib/libfoo.la # 'li...
How to write a switch statement in Ruby
...sing the === operator. For example, 1..5 === x, and not x === 1..5.
This allows for sophisticated when clauses as seen above. Ranges, classes and all sorts of things can be tested for rather than just equality.
Unlike switch statements in many other languages, Ruby’s case does not have fall-thr...
What is the difference between bindParam and bindValue?
...value, if any, of their associated parameter markers
Example:
$value = 'foo';
$s = $dbh->prepare('SELECT name FROM bar WHERE baz = :baz');
$s->bindParam(':baz', $value); // use bindParam to bind the variable
$value = 'foobarbaz';
$s->execute(); // executed with WHERE baz = 'foobarbaz'
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Show percent % instead of counts in charts of categorical variables
...for 'ggplot count vs percentage histogram' so hopefully this helps distill all the information currently housed in comments on the accepted answer.
Remark: If hp is not set as a factor, ggplot returns:
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C++, copy set to vector
...hold the input range.
std::back_inserter creates an output iterator that calls push_back on a container for each element, so each element is inserted into the container. Alternatively, you could have created a sufficient number of elements in the std::vector to hold the range being copied:
std::v...
Why is there no logical xor in JavaScript?
...r. Mainly because it's not useful. Bitwise XOR is extremely useful, but in all my years of programming I have never needed a logical XOR.
If you have two boolean variables you can mimic XOR with:
if (a != b)
With two arbitrary variables you could use ! to coerce them to boolean values and then u...
Is #pragma once a safe include guard?
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It shouldn't be any slower at all (with GCC anyway).
– Jason Coco
Apr 24 '09 at 21:07
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Is SQL syntax case sensitive?
... are case-insensitive (SELECT, FROM, WHERE, etc), but are often written in all caps. However in some setups table and column names are case-sensitive. MySQL has a configuration option to enable/disable it. Usually case-sensitive table and column names are the default on Linux MySQL and case-insensit...
Why can't C# interfaces contain fields?
For example, suppose I want an ICar interface and that all implementations will contain the field Year . Does this mean that every implementation has to separately declare Year ? Wouldn't it be nicer to simply define this in the interface?
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How to get the current working directory in Java?
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@ubuntudroid: that's why i mentioned specifically that it will print the path from where the application had initialized. My guess the thread starter directly run the jar/program after starting commnad prompt (which is basically at C:\WINDOWS\system32). I hope you under...