• d-bugmail puremagic.com (45/45) Apr 29 2019 https://issues.dlang.org/show_bug.cgi?id=19837

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=19837

          Issue ID: 19837
           Summary: std.random.isUniformRNG(Rng, ElementType) should not
                    require Rng.front to be annotated ` property`
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody puremagic.com
          Reporter: n8sh.secondary hotmail.com

Example:

---
void main()
{
    import std.random : isUniformRNG;

    static struct RND1
    {
        ulong state;
         property uint front() const { return cast(uint) (state >> 32); }
        void popFront() { state = state * 6364136223846793005 +
1442695040888963407; }
        enum empty = false;
        enum isUniformRandom = true;
    }

    static struct RND2 // Same but `front` is not  property
    { 
        ulong state;
        uint front() const { return cast(uint) (state >> 32); }
        void popFront() { state = state * 6364136223846793005 +
1442695040888963407; }
        enum empty = false;
        enum isUniformRandom = true;
    }

    static assert(isUniformRNG!RND1);
    static assert(isUniformRNG!(RND1, uint));
    static assert(isUniformRNG!RND2);
    static assert(isUniformRNG!(RND2, uint)); // Fails because RND2.front is
not ` property`.
}
---

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