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Associative arrays in Shell scripts
... It a pretty hackish emulation of associative arrays using BASH parameter substitution. The "key" param-sub substitutes everything before the colon and the value pattern substitutes everything after the colon. Similar to a regex wildcard match. So NOT a true associative array. Not recomme...
How to forward declare a template class in namespace std?
...n in my main. I get errors. Of course, I know that there are more template params for std::list (allocator I think). But, that is beside the point. Do I have to know the full template declaration of a template class to be able to forward declare it?
...
What does the explicit keyword mean?
...
The compiler is allowed to make one implicit conversion to resolve the parameters to a function. What this means is that the compiler can use constructors callable with a single parameter to convert from one type to another in order to get the right type for a parameter.
Here's an example class ...
The shortest possible output from git log containing author and date
...n: "git log output like svn ls -v", i found out that I could add the exact params I needed.
To shorten the date (not showing the time) use --date=short
In case you were curious what the different options were:
%h = abbreviated commit hash
%x09 = tab (character for code 9)
%an = author name
%ad = a...
When should an IllegalArgumentException be thrown?
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Any API should check the validity of the every parameter of any public method before executing it:
void setPercentage(int pct, AnObject object) {
if( pct < 0 || pct > 100) {
throw new IllegalArgumentException("pct has an invalid value");
}
if (o...
Dynamic SQL - EXEC(@SQL) versus EXEC SP_EXECUTESQL(@SQL)
...esql is more likely to promote query plan reuse. When using sp_executesql, parameters are explicitly identified in the calling signature. This excellent article descibes this process.
The oft cited reference for many aspects of dynamic sql is Erland Sommarskog's must read: "The Curse and Blessings ...
Weighted random numbers
...;typename _IntType>
void
discrete_distribution<_IntType>::param_type::
_M_initialize()
{
if (_M_prob.size() < 2)
{
_M_prob.clear();
return;
}
const double __sum = std::accumulate(_M_prob.begin(),
...
When to encode space to plus (+) or %20?
...ww.example.com/path/foo+bar/path?query+name=query+value
In this URL, the parameter name is query name with a space and the value is query value with a space, but the folder name in the path is literally foo+bar, not foo bar.
%20 is a valid way to encode a space in either of these contexts. So if ...
What is the purpose of a self executing function in javascript?
...works.
When you wrap a function definition in parentheses, and include a parameter list (another set or parentheses!) it acts as a function call.
So lets look at our code again, with some self-executing syntax:
(function main() {
var userName = "Sean";
console.log(name());
function n...
Set timeout for ajax (jQuery)
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You can get see what type of error was thrown by accessing the textStatus parameter of the error: function(jqXHR, textStatus, errorThrown) option. The options are "timeout", "error", "abort", and "parsererror".
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