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Templatize the GncInt128 constructors.

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Allows single or pair of arbitrary integral types to construct, without
explicitly creating all of the possibilities.
This commit is contained in:
John Ralls
2015-10-31 15:53:32 -07:00
parent 05f08f330d
commit 089817a9f6
2 changed files with 43 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
src/libqof/qof/gnc-int128.cpp
View File

@@ -46,17 +46,9 @@ namespace {
GncInt128::GncInt128 () : m_flags {}, m_hi {0}, m_lo {0}{}
GncInt128::GncInt128 (int64_t lower) :
m_flags {static_cast<unsigned char>(lower < 0 ? neg : pos)},
m_hi {0},
m_lo {static_cast<uint64_t>(lower < 0 ? -lower : lower)} {}
GncInt128::GncInt128 (uint64_t lower) :
m_flags {}, m_hi {0}, m_lo {lower} {}
GncInt128::GncInt128 (int64_t upper, int64_t lower, unsigned char flags) :
m_flags {static_cast<unsigned char>(flags ^ (upper < 0 ? neg :
upper == 0 && lower < 0 ? neg : pos))},
upper == 0 && lower < 0 ? neg : pos))},
m_hi {static_cast<uint64_t>(upper < 0 ? -upper : upper)},
m_lo {static_cast<uint64_t>(lower < 0 ? -lower : lower)}
{
@@ -68,9 +60,12 @@ GncInt128::GncInt128 (int64_t upper, int64_t lower, unsigned char flags) :
m_hi >>= 1;
}
GncInt128::GncInt128 (int64_t upper, uint64_t lower, unsigned char flags) :
m_flags {static_cast<unsigned char>(flags ^ (upper < 0 ? neg : pos))},
m_hi {static_cast<uint64_t>(upper < 0 ? -upper : upper)}, m_lo {lower} {}
GncInt128::GncInt128 (uint64_t upper, uint64_t lower, unsigned char flags) :
m_flags {flags}, m_hi {upper},
m_lo {lower} {}
m_flags {flags}, m_hi {upper}, m_lo {lower} {}
GncInt128&
GncInt128::zero () noexcept
@@ -609,7 +604,7 @@ div_single_leg (uint64_t* u, size_t m, uint64_t v, GncInt128& q, GncInt128& r) n
}// namespace
void
void
GncInt128::div (const GncInt128& b, GncInt128& q, GncInt128& r) noexcept
{
if (isOverflow() || b.isOverflow())

58
src/libqof/qof/gnc-int128.hpp
View File

@@ -42,6 +42,7 @@ extern "C"
#include <stdexcept>
#include <string>
#include <ostream>
#include <type_traits>
//using std::string;
@@ -74,14 +75,6 @@ enum // Values for m_flags
overflow = 2,
NaN = 4
};
GncInt128 ();
GncInt128 (int16_t lower) : GncInt128{static_cast<int64_t>(lower)} {};
GncInt128 (uint16_t lower) : GncInt128{static_cast<uint64_t>(lower)} {};
GncInt128 (int32_t lower) : GncInt128{static_cast<int64_t>(lower)} {};
GncInt128 (uint32_t lower) : GncInt128{static_cast<uint64_t>(lower)} {};
GncInt128 (int64_t lower);
GncInt128 (uint64_t lower);
/**
* Construct a GncInt128 from two int64_t.
*
@@ -90,21 +83,42 @@ enum // Values for m_flags
* upper, so the lower magnitude will be subracted from UINT64_MAX to
* obtain the lower limb value.
*/
GncInt128 (int16_t upper, int16_t lower, unsigned char flags = '\0') :
GncInt128{static_cast<int64_t>(upper), static_cast<int64_t>(lower),
flags} {};
GncInt128 (uint16_t upper, uint16_t lower, unsigned char flags = '\0') :
GncInt128{static_cast<int64_t>(upper), static_cast<int64_t>(lower),
flags} {};
GncInt128 (int32_t upper, int32_t lower, unsigned char flags = '\0') :
GncInt128{static_cast<int64_t>(upper), static_cast<int64_t>(lower),
flags} {};
GncInt128 (uint32_t upper, uint32_t lower, unsigned char flags = '\0') :
GncInt128{static_cast<int64_t>(upper), static_cast<int64_t>(lower),
flags} {};
GncInt128 (int64_t upper, int64_t lower, unsigned char flags = '\0');
GncInt128 (uint64_t upper, uint64_t lower, unsigned char flags = '\0');
GncInt128();
template <typename T>
GncInt128(T lower) : GncInt128 {INT64_C(0), static_cast<int64_t>(lower)}
{
static_assert (std::is_integral<T>(),
"GncInt128 can be constructed only with "
"integral arguments.");
}
GncInt128(uint64_t lower) : GncInt128 {UINT64_C(0), lower} {}
/** Double-integer constructor template.
*/
template <typename T, typename U>
GncInt128(T upper, U lower, unsigned char flags = '\0') :
GncInt128 {static_cast<int64_t>(upper),
static_cast<int64_t>(lower), flags}
{
static_assert (std::is_integral<T>(),
"GncInt128 can be constructed only with "
"integral arguments.");
static_assert (std::is_integral<U>(),
"GncInt128 can be constructed only with "
"integral arguments.");
}
GncInt128 (int64_t upper, int64_t lower, unsigned char flags = '\0');
template <typename T>
GncInt128(T upper, uint64_t lower) :
GncInt128 {static_cast<int64_t>(upper), lower}
{
static_assert (std::is_integral<T>(),
"GncInt128 can be constructed only with "
"integral arguments.");
}
GncInt128 (int64_t upper, uint64_t lower, unsigned char flags = '\0');
GncInt128 (uint64_t upper, uint64_t lower, unsigned char flags = '\0');
/**
* Clear the object.
*