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Add zero and abs functions to QofInt128.

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This commit is contained in:
John Ralls 2014-11-17 12:08:00 -08:00
parent 1e6855efe5
commit c7752d5d3c
2 changed files with 30 additions and 1 deletions
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18
src/libqof/qof/qofint128.cpp
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@ -64,6 +64,14 @@ QofInt128::QofInt128 (int64_t upper, int64_t lower, unsigned char flags) :
m_flags {flags}, m_hi {upper},
m_lo {lower} {}
QofInt128&
QofInt128::zero () noexcept
{
m_flags = 0;
m_lo = m_hi = UINT64_C(0);
return *this;
}
QofInt128::operator int64_t() const
{
if ((m_flags & neg) && isBig())
@ -138,6 +146,16 @@ QofInt128::isZero() const noexcept
return ((m_flags & (overflow | NaN)) == 0 && m_hi == 0 && m_lo == 0);
}
QofInt128
QofInt128::abs() const noexcept
{
if (isNeg())
return operator-();
return *this;
}
QofInt128
QofInt128::operator-() const noexcept
{

13
src/libqof/qof/qofint128.hpp
View File

@ -42,6 +42,7 @@
* on an overflowed or NaN QofInt128 will yield an overflowed or NaN
* result, so calling routines need not check until the end of a
* chained calculation.
* QofInt128 uses implicit copy and move constructors and implicit destructor.
*/
class QofInt128
{
@ -75,6 +76,15 @@ enum // Values for m_flags
*/
QofInt128 (int64_t upper, int64_t lower, unsigned char flags = '\0');
QofInt128 (uint64_t upper, uint64_t lower, unsigned char flags = '\0');
/**
* Clear the object.
*
* Sets all member variables to zero.
* @return A reference to the object for chaining.
*/
QofInt128& zero() noexcept;
/**
* Compare function.
*
@ -90,7 +100,7 @@ enum // Values for m_flags
*/
QofInt128 gcd (const QofInt128& b) const noexcept;
/**
* Computes the Least Common Multiple between the object and paramter
* Computes the Least Common Multiple between the object and parameter
*
* @return A QofInt128 having the LCM.
*/
@ -152,6 +162,7 @@ enum // Values for m_flags
*/
char* asCharBufR(char* buf) const noexcept;
QofInt128 abs() const noexcept;
QofInt128 operator-() const noexcept;
explicit operator bool() const noexcept;