BloombergLP::bdldfp::DecimalImpUtil::logB

Return the FLT_RADIX‐based logarithm (i.e., base 10) of the absolute value of the specified x.

Synopsis

Declared in <bdldfp_decimalimputil.h>

static
DecimalImpUtil::ValueType32
logB(ValueType32 x);

Description

Special value handling: * If x is +/‐0, ‐infinity is returned and the value of the macro ERANGE is stored into errno. * If x is 1, +0 is returned. * If x is +/‐infinity, +infinity is returned. * If x is quiet NaN, quiet NaN is returned. * If x is signaling NaN, quiet NaN is returned and the value of the macro EDOM is stored into errno.

Examples: logB( 10.0) ==> 1.0; logB(‐100.0) ==> 2.0

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