fork download
copy 
  1. import std.exception, std.stdio;
  2.  
  3. struct CustomInteger(T, T minValue, T maxValue)
  4. {
  5. 	T value_;
  6.  
  7. 	alias value this;
  8.  
  9. 	@property T value() const
  10. 	{
  11. 		enforce((value_ >= minValue) &&
  12. 				(value_ <= maxValue));
  13.  
  14. 		return value_;
  15. 	}
  16.  
  17. 	@property void value(T v)
  18. 	{
  19. 		value_ = v;
  20. 	}
  21.  
  22. 	ref CustomInteger opOpAssign(string op, T2)(T2 rhs)
  23. 	{
  24. 		static if (is (T2 == CustomInteger)) {
  25. 			mixin("value_ " ~ op ~ "= rhs.value_;");
  26. 			return this;
  27.  
  28. 		} else {
  29. 			return opOpAssign!op(CustomInteger(rhs));
  30. 		}
  31. 	}
  32.  
  33. }
  34.  
  35. void main()
  36. {
  37. 	alias Balance = CustomInteger!(int, -32_000, 32_000);
  38.  
  39. 	auto b = Balance(42);
  40.  
  41. 	b += 5; // OK
  42.  
  43. 	writeln(b); // 47
  44. }
Success #stdin #stdout 0s 4152KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
47
https://ideone.com/Ekx0wC
language:
D (gdc 8.3)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!