[LLVMbugs] [Bug 18767] New: uniform_real_distribution produces variates in its range _inclusive_ rather than exclusive.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18767

            Bug ID: 18767
           Summary: uniform_real_distribution produces variates in its
                    range _inclusive_ rather than exclusive.
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: seth.cantrell at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following program should complete successfully.

#include <cassert>
#include <random>
#include <cmath>

int main() {
    double range[] = {1.0, std::nextafter(1.0, 2.0)};

    std::uniform_real_distribution<double> dist(range[0], range[1]);
    std::default_random_engine eng;

    for (int i=0; i<10; ++i) {
        double v = dist(eng);
        assert(range[0] <= v && v < range[1]);
    }
}

Using libc++ it instead produces an assertion failure. Other implementations
(vc++ and libstdc++) exhibit the same behavior.

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