If a selection on multiple arguments for a type generic expression is wanted, and all types in question are arithmetic types, an easy way to avoid nested _Generic expressions is to use addition of the parameters in the controlling expression:
int max_int(int, int);
unsigned max_unsigned(unsigned, ...
With any variadic function, the function must know how to interpret the variable arguments list. With the printf() or scanf() functions, the format string tells the function what to expect.
The simplest technique is to pass an explicit count of the other arguments (which are normally all the same ...
Prefer
public class Order
{
public OrderLine AddOrderLine(OrderLine orderLine)
{
if (orderLine == null) throw new ArgumentNullException(nameof(orderLine));
...
}
}
Over
public class Order
{
public OrderLine AddOrderLine(OrderLine orderLine)
{
...
First, some terminology:
argument (actual parameter): the actual variable being passed to a function;
parameter (formal parameter): the receiving variable that is used in a function.
In Python, arguments are passed by assignment (as opposed to other languages, where arguments can be passed by...
if ($PSCmdlet.ShouldProcess("Target of action")) {
# Do the thing
}
When using -WhatIf:
What if: Performing the action "Invoke-MyCmdlet" on target "Target of action"
When using -Confirm:
Are you sure you want to perform this action?
Performing operation &qu...
Template may accept both lvalue and rvalue references using forwarding reference:
template <typename T>
void f(T &&t);
In this case, the real type of t will be deduced depending on the context:
struct X { };
X x;
f(x); // calls f<X&>(x)
f(X()); // calls f<X>(...
After receiving the arguments, you can print them as follows:
int main(int argc, char **argv)
{
for (int i = 1; i < argc; i++)
{
printf("Argument %d: [%s]\n", i, argv[i]);
}
}
Notes
The argv parameter can be also defined as char *argv[].
argv[0] may co...
Putting a & (ampersand) in front of an argument will pass it as the method's block. Objects will be converted to a Proc using the to_proc method.
class Greeter
def to_proc
Proc.new do |item|
puts "Hello, #{item}"
end
end
end
greet = Greeter.new
%w(world l...
ArgumentCondition
This method checks to see if the argument specified is true. It also takes in the name of the argument that is logged if the condition fails.
Assert.ArgumentCondition(pageIndex >= 0, "pageIndex", "Value must be greater than or equal to zero.");
ArgumentN...
The following code will print the arguments to the program, and
the code will attempt to convert each argument into a number (to a
long):
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <limits.h>
int main(int argc, char* argv[]) {
for (int ...
If you want two or more arguments to be mutually exclusive. You can use the function argparse.ArgumentParser.add_mutually_exclusive_group(). In the example below, either foo or bar can exist but not both at the same time.
import argparse
parser = argparse.ArgumentParser()
group = parser.add_mut...
Whenever a Python script is invoked from the command line, the user may supply additional command line arguments which will be passed on to the script. These arguments will be available to the programmer from the system variable sys.argv ("argv" is a traditional name used in most programmi...
Overload resolution partitions the cost of passing an argument to a parameter into one of four different categorizes, called "sequences". Each sequence may include zero, one or several conversions
Standard conversion sequence
void f(int a); f(42);
User defined conversion seque...
The ** operator works similarly to the * operator but it applies to keyword parameters.
def options(required_key:, optional_key: nil, **other_options)
other_options
end
options(required_key: 'Done!', foo: 'Foo!', bar: 'Bar!')
#> { :foo => "Foo!", :bar => "Bar!" ...
Consider this simple class:
class SmsUtil
{
public bool SendMessage(string from, string to, string message, int retryCount, object attachment)
{
// Some code
}
}
Before C# 3.0 it was:
var result = SmsUtil.SendMessage("Mehran", "Maryam", "Hello...
interface ITable {
// an indexer can be declared in an interface
object this[int x, int y] { get; set; }
}
class DataTable : ITable
{
private object[,] cells = new object[10, 10];
/// <summary>
/// implementation of the indexer declared in the interface
//...
In JavaScript all arguments are passed by value. When a function assigns a new value to an argument variable, that change will not be visible to the caller:
var obj = {a: 2};
function myfunc(arg){
arg = {a: 5}; // Note the assignment is to the parameter variable itself
}
myfunc(obj);
conso...
local function A(name, age, hobby)
print(name .. "is " .. age .. " years old and likes " .. hobby)
end
A("john", "eating", 23) --> prints 'john is eating years old and likes 23'
-- oops, seems we got the order of the arguments wrong...
-- this happ...
