BloombergLP::bdldfp::DecimalImpUtil::log

Return the natural logarithm of x.

Synopsis

Declared in <bdldfp_decimalimputil.h>

static
DecimalImpUtil::ValueType32
log(ValueType32 x);

Description

Return the natural (base e) logarithm of the specified x.

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 negative, quiet NaN is returned and the value of the macro EDOM is stored into errno. * 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.

Return Value

the natural logarithm of x

Parameters

Name

Description

input value

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