Opened 3 years ago

Closed 3 years ago

## #12112 closed Bugs (fixed)

# cpp_dec_float: assigning double(-infinity) drops the negative

Reported by: | Owned by: | John Maddock | |
---|---|---|---|

Milestone: | To Be Determined | Component: | multiprecision |

Version: | Boost 1.60.0 | Severity: | Problem |

Keywords: | Cc: |

### Description

Initializing (or assigning) negative infinity to a cpp_dec_float assigns positive infinity instead of negative infinity.

The problem seems to be that cpp_dec_float.hpp, in operator=(long double a), does:

if((boost::math::isinf)(a)) return *this = inf();

but I think that should instead be (I have not tested this):

if((boost::math::isinf)(a)) { *this = inf(); if (a < 0) negate(); return *this; }

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Thanks, that exposed a number of related issues, fixed in https://github.com/boostorg/multiprecision/commit/aeab24b4fbb5738740d40beb1c55aad039ca1ac1