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What is the difference between const_iterator and non-const iterator in the C++ STL?
...etty much be self-explanatory. If iterator points to an element of type T, then const_iterator points to an element of type 'const T'.
It's basically equivalent to the pointer types:
T* // A non-const iterator to a non-const element. Corresponds to std::vector<T>::iterator
T* const // A cons...
Use of def, val, and var in scala
...thod, you can call it with or without '()'. If you simply write:
person
then you are calling this method (and if you don't assign the return value, it will just be discarded). In this line of code:
person.age = 20
what happens is that you first call the person method, and on the return value (...
Methods inside enum in C#
...ing ToString()
{
return $"{value} - {displayName}!";
}
}
Then you can use it like an enum, with the possibility to put methods inside it (among another things):
EmployeeType.Manager.ToString();
//0 - Manager
EmployeeType.Servant.ToString();
//1 - Servant
EmployeeType.Assistant.ToS...
When saving, how can you check if a field has changed?
... @callum so that if you make changes to the object, save it, then makes additional changes and call save() on it AGAIN, it will still work correctly.
– philfreo
Mar 14 '12 at 22:57
...
Ruby, Difference between exec, system and %x() or Backticks
...ing will be subject to shell expansion. When using more than one argument, then the first one is used to execute a program and the following are provided as arguments to the program to be invoked.
Open3.popen3
Sometimes the required information is written to standard input or standard error and yo...
Can I get the name of the current controller in the view?
...tly) . If you have a static_pages controller with an about action, you can then highlight the link like so in your view:
<li>
<a class='button <% if controller.controller_name == "static_pages" && controller.action_name == "about" %>active<%end%>' href="/about">
...
How to find all positions of the maximum value in a list?
...could use this to get the first instance of the largest valued element and then set it to a ridiculously large negative number, and then find the next largest valued element, but that would be too complex.
– Neil Chowdhury
Oct 14 '17 at 17:15
...
Execute command on all files in a directory
...
If no files exist in /dir/, then the loop still runs once with a value of '*' for $file, which may be undesirable. To avoid this, enable nullglob for the duration of the loop. Add this line before the loop shopt -s nullglob and this line after the loop...
Creating C formatted strings (not printing them)
... s);
// You'd like to call a function that takes a format string
// and then calls foo():
void foofmt( char* fmt, ...)
{
char buf[100]; // this should really be sized appropriately
// possibly in response to a call to vsnprintf()
va_list vl;
va_start(vl, fm...
Eclipse, regular expression search and replace
... gets loaded with the "('any text'):" or, in the example, the "(_list):"
Then in the replace, just put the $1$2 to replace all three blocks with just the first two.
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