# Re: Ranged Integers

From:
Saeed Amrollahi <s_amrollahi@yahoo.com>
Newsgroups:
comp.lang.c++
Date:
Sun, 02 Sep 2007 23:55:11 -0700
Message-ID:
On Sep 3, 2:06 am, foothomp...@yahoo.com wrote:

is there a simple integer type library around that behaves like normal
integers, i.e has all the same operations, but except the value can
only be in a specific range, like 0 to 100, and if the value is
outside of this range, it will throw an exception or assert fail?

Hi

I think the solution by Jerry is good and sophisticated. But a simpler
version of range concept that I usually use, is a simple rangle class
offered by Bjarne Stroustrup in his seminars:
// Range concept (for integers)
class Range { // simple value type
int value, low, high; // invariant: low <= value < high
check(int v) { if (!(low<=v && v<high)) throw Range_error(); }
public:
Range(int lo, int v, int hi) : low(lo), value(v), high(hi)
{ check(v); }
Range& operator=(const Range& a) { check(a.v); value = a.value;
return *this; }
Range& operator=(int a) { check(a); value = a; return *this; }
operator int() { return value; }
};

Regards,
Saeed Amrollahi

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