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Which, if any, C++ compilers do tail-recursion optimization?
...t for program correctness.
#include <stdio.h>
static int atoi(const char *str, int n)
{
if (str == 0 || *str == 0)
return n;
return atoi(str+1, n*10 + *str-'0');
}
int main(int argc, char **argv)
{
for (int i = 1; i != argc; ++i)
printf("%s -> %d\n", argv[i], at...
Python - Create a list with initial capacity
...
This isn't valid; you're formatting a string with each iteration, which takes forever relative to what you're trying to test. Additionally, given that 4% can still be significant depending on the situation, and it's an underestimate...
– Ph...
What is boxing and unboxing and what are the trade offs?
...d structures, enumerations.
Reference Types are:
Classes,interfaces,arrays,strings and objects
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How do you add swap to an EC2 instance?
...nce.
Paging works by creating an area on your hard drive and using it for extra memory, this memory is much slower than normal memory however much more of it is available.
To add this extra space to your instance you type:
sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
sudo /sbin/mkswa...
How to get current user, and how to use User class in MVC5?
...serId();
In the default template of MVC 5, user ID is a GUID stored as a string.
No best practice yet, but found some valuable info on extending the user profile:
Overview of Identity: https://devblogs.microsoft.com/aspnet/introducing-asp-net-identity-a-membership-system-for-asp-net-application...
Why split the tag when writing it with document.write()?
...s a valid escape sequence for /, so why not just use that instead of those string literal escapes for <? E.g. document.write('<script src=foo.js><\/script>');. Also, </script> is not the only character sequence that can close a <script> element. Some more info here: mathia...
Are HLists nothing more than a convoluted way of writing tuples?
...(t2)
val t2b = f2.tupled
// Inferred type of t2b is (Int, Boolean, Double, String, String, Int, Boolean)
Without using HLists (or something equivalent) to abstract over the arity of the tuple arguments to flatten it would be impossible to have a single implementation which could accept arguments o...
Unnecessary curly braces in C++?
...
The extra braces are used to define the scope of the variable declared inside the braces. It is done so that the destructor will be called when the variable goes out of scope. In the destructor, you may release a mutex (or any ot...
iOS app error - Can't add self as subview
...NavigationController+Consistent.h"
#import <objc/runtime.h>
/// This char is used to add storage for the isPushingViewController property.
static char const * const ObjectTagKey = "ObjectTag";
@interface UINavigationController ()
@property (readwrite,getter = isViewTransitionInProgress) BOOL ...
How can I override the OnBeforeUnload dialog and replace it with my own?
...saved changes!';
}
Here's a reference to this from Microsoft:
When a string is assigned to the returnValue property of window.event, a dialog box appears that gives users the option to stay on the current page and retain the string that was assigned to it. The default statement that appears in...