diff options
| -rw-r--r-- | Doc/lib/libdecimal.tex | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/Doc/lib/libdecimal.tex b/Doc/lib/libdecimal.tex index 205a2c8..3b41d6a 100644 --- a/Doc/lib/libdecimal.tex +++ b/Doc/lib/libdecimal.tex @@ -15,7 +15,7 @@ Specification.} \versionadded{2.4} -The decimal \module{module} provides support for decimal floating point +The \module{decimal} module provides support for decimal floating point arithmetic. It offers several advantages over the \class{float()} datatype: \begin{itemize} @@ -89,7 +89,8 @@ the decimal module are: \constant{Clamped}, \constant{InvalidOperation}, For each signal there is a flag and a trap enabler. When a signal is encountered, its flag incremented from zero and, then, if the trap enabler -is set to one, an exception is raised. +is set to one, an exception is raised. Flags are sticky, so the user +needs to reset them before monitoring a calculation. \begin{seealso} @@ -504,10 +505,14 @@ with the \class{Context} constructor. The \var{prec} field is a positive integer that sets the precision for arithmetic operations in the context. - The \var{rounding} option is one of: \constant{ROUND_CEILING}, - \constant{ROUND_DOWN}, \constant{ROUND_FLOOR}, \constant{ROUND_HALF_DOWN} - (towards zero), \constant{ROUND_HALF_EVEN}, \constant{ROUND_HALF_UP}, or - \constant{ROUND_UP} (away from zero). + The \var{rounding} option is one of: + \constant{ROUND_CEILING} (towards \constant{Infinity}), + \constant{ROUND_DOWN} (towards zero), + \constant{ROUND_FLOOR} (towards \constant{-Infinity}), + \constant{ROUND_HALF_DOWN} (towards zero), + \constant{ROUND_HALF_EVEN}, + \constant{ROUND_HALF_UP} (away from zero), or + \constant{ROUND_UP} (away from zero). The \var{trap_enablers} and \var{flags} fields are mappings from signals to either \constant{0} or \constant{1}. |