What is struct initialization in D programming?

What is a struct in D programming?

A struct is a data type that allows the combinations of different data items which are user-defined.

How to initialize a struct?

Structs can be initialized in two ways:

  1. The construtor format
  2. The {} format

Example

Let’s look at the example below:

import std.stdio;
struct Clothes { 
   char [] color; 
   int   size; 
  
}; 
 
void main( ) { 
//Initializing a struct using a constructor
   Clothes Clothe1 = Clothes("Yellow".dup,50 ); 
   printClotheDetails( Clothe1 ); 
   
 
   // initializing a struct using the {}
   Clothes Clothe2 =  {color:"Purple".dup, size:40};
   printClotheDetails( Clothe2 ); 
}
  
void printClotheDetails( Clothes clothe ) { 
   writeln( "Clothe color : ", clothe.color); 
   writeln( "Clothe size : ", clothe.size); 
  
}

Explanation

  • Line 3: We define the Clothes struct using the struct keyword.

  • Lines 4 and 5: We define our struct data items.

  • Line 11: We initialize an instance of the Clothes struct as Clothe1, giving the data items values. Here, we use the constructor method for initialization.

  • Line 16: We initialize an instance of the Clothes struct as Clothe2, giving the data items values. Here, we use {} format for initialization.

  • Lines 21 and 22: We print our output.

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