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Return array in a function
... a normal array:
int main()
{
int y[10];
int *a = fillarr(y);
cout << a[0] << endl;
}
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How should one use std::optional?
...
The simplest example I can think of:
std::optional<int> try_parse_int(std::string s)
{
//try to parse an int from the given string,
//and return "nothing" if you fail
}
The same thing might be accomplished with a reference argument instead (as in the following...
Simplest way to serve static data from outside the application server in a Java web application
...les are all located outside the webapp, and you want to have Tomcat's DefaultServlet to handle them, then all you basically need to do in Tomcat is to add the following Context element to /conf/server.xml inside <Host> tag:
<Context docBase="/path/to/files" path="/files" />
This way the...
What is the fastest way to get the value of π?
...tes π by looking at its own area.
IOCCC 1988 : westley.c
#define _ -F<00||--F-OO--;
int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()
{
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erb, haml or slim: which one do you suggest? And why? [closed]
... (taken from official HAML site):
In ERB your view will look like this:
<div id="profile">
<div class="left column">
<div id="date"><%= print_date %></div>
<div id="address"><%= current_user.address %></div>
</div>
<div class="...
How to cast List to List
...object to any type by up-casting it to Object first. in your case:
(List<Customer>)(Object)list;
you must be sure that at runtime the list contains nothing but Customer objects.
Critics say that such casting indicates something wrong with your code; you should be able to tweak your type ...
How do I rename a local Git branch?
...u want to rename a branch while pointed to any branch, do:
git branch -m <oldname> <newname>
If you want to rename the current branch, you can do:
git branch -m <newname>
A way to remember this is -m is for "move" (or mv), which is how you rename files. Adding an alias could ...
Difference between Lookup() and Dictionary(Of list())
...kely to be equivalent in efficiency - the lookup may well use a Dictionary<TKey, GroupingImplementation<TValue>> behind the scenes, for example. Choose between them based on your requirements. Personally I find that the lookup is usually a better fit than a Dictionary<TKey, List<TV...
Empty arrays seem to equal true and false at the same time
...xt rule that applies is #19:
19. If Type(y) is Boolean, return the result of the comparison x ==
ToNumber(y).
The result of ToNumber(false) is 0, so we now have:
[] == 0
Again, rule #1 tells us to jump to step #14, but the next step that actually applies is #21:
21. If Type(x) is Obje...
Java ArrayList - how can I tell if two lists are equal, order not mattering?
...ts of Strings it would be something like:
public boolean equalLists(List<String> one, List<String> two){
if (one == null && two == null){
return true;
}
if((one == null && two != null)
|| one != null && two == null
|| one.s...