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digitalmars.D.learn - Array Template

reply Vino <vino.bheeman hotmail.com> writes:
Hi All,

   Request your help, Is it possible to an template array 
something similar as below so that we can insert any type of 
value(string, int etc). If possible can you provide me a example 
of how to define such array.

Array!(Tuple!(T n))

From,
Vino.B
Dec 15 2017
next sibling parent "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Fri, Dec 15, 2017 at 05:21:55PM +0000, Vino via Digitalmars-d-learn wrote:

 Hi All,
 
   Request your help, Is it possible to an template array something
 similar as below so that we can insert any type of value(string, int
 etc). If possible can you provide me a example of how to define such
 array.


[...]

-----
import std.variant;
Variant[] array;
-----

Variant can hold any type, so you can store whatever you want in the
array.  To get stuff out, though, you'll need to use .get with the
proper type, e.g.:

	Variant[] array;
	array ~= 123;
	array ~= "abc";

	int i = array[0].get!int;
	string s = array[1].get!string;

.get will throw an exception if the boxed type is not compatible with
the requested type, e.g.:

	// This will throw an Exception because array[1] doesn't hold an
	// int.
	int i = array[1].get!int;


T

-- 
Gone Chopin. Bach in a minuet.
Dec 15 2017
prev sibling parent reply codephantom <me noyb.com> writes:
On Friday, 15 December 2017 at 17:21:55 UTC, Vino wrote:

 Hi All,

   Request your help, Is it possible to an template array 
 something similar as below so that we can insert any type of 
 value(string, int etc). If possible can you provide me a 
 example of how to define such array.

 Array!(Tuple!(T n))

 From,
 Vino.B


Do you  mean 'an array of variable types of tuples'.

If so...good luck with that ;-)
Dec 15 2017
parent reply Vino <vino.bheeman hotmail.com> writes:
On Saturday, 16 December 2017 at 06:42:53 UTC, codephantom wrote:

 On Friday, 15 December 2017 at 17:21:55 UTC, Vino wrote:

 Hi All,

   Request your help, Is it possible to an template array 
 something similar as below so that we can insert any type of 
 value(string, int etc). If possible can you provide me a 
 example of how to define such array.

 Array!(Tuple!(T n))

 From,
 Vino.B


 Do you  mean 'an array of variable types of tuples'.

 If so...good luck with that ;-)


Yes, will give a try.

From,
Vino.B
Dec 16 2017
parent codephantom <me noyb.com> writes:
On Saturday, 16 December 2017 at 14:14:28 UTC, Vino wrote:

 Yes, will give a try.

 From,
 Vino.B



well, this sort of gets there ;-)

// -----
module test;

import std.stdio;
import std.variant;
import std.typecons;
import std.conv;
import std.string;

void main()
{
     Variant[] arr;

     auto x = tuple(5, "hello", 4.3);
     arr ~= cast(Variant)x;

     auto y = tuple("hello", 4.3);
     arr ~= cast(Variant)y;

     auto z = tuple("hello", "world", 1, 2, 3, 5.5);
     arr ~= cast(Variant)z;

     int i = 0;
     foreach(elem; arr)
     {
         writeln(
                 "arr[", i, "] values are : ",
                 to!(string)((to!(string)(elem))
                 [( indexOf( to!(string)(elem), ")" ) + 
2)..($-1)]) );
         i++;
     }

}
// -----
Dec 18 2017