## #6517 closed Bugs (fixed)

# boost::math::isfinite returns false for unsigned int 0

Reported by: | Owned by: | John Maddock | |
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Milestone: | Boost 1.52.0 | Component: | math |

Version: | Boost 1.48.0 | Severity: | Problem |

Keywords: | math isfinite | Cc: |

### Description

from: boost/math/distributions/detail/common_error_handling.hpp

(boost::math::isfinite)(0U) returns 0

(boost::math::isfinite)(1U) returns 1

To recreate the problem, the following program:

#include <iostream> #include <boost/math/distributions/detail/common_error_handling.hpp> int main(int argc, char* argv[]) {

std::cout << "isfinite(0U)=" << (boost::math::isfinite)(0U) << std::endl; std::cout << "isfinite(1U)=" << (boost::math::isfinite)(0U) << std::endl;

}

prints:

isfinite(0U)=0 isfinite(1U)=0

This can't happen with the std::isinf() tests because they only take floating point args, so the unsigned int would get cast.

### Attachments (0)

### Change History (3)

### comment:1 Changed 5 years ago by

Status: | new → assigned |
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### comment:2 Changed 5 years ago by

Resolution: | → fixed |
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Status: | assigned → closed |

### comment:3 Changed 5 years ago by

Milestone: | To Be Determined → Boost 1.52.0 |
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(In [79438]) Allow fpclassify and friends to be used with integer types via the usual promotion mechanism. Fixes #6517.