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Issue #77 Simplify compare functions

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This commit is contained in:
Mat Sutcliffe
2020-08-24 00:53:35 +01:00
parent 6703922de5
commit 84d8d747ad
2 changed files with 31 additions and 67 deletions
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47
src/blackmisc/comparefunctions.h
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@@ -11,31 +11,46 @@
#ifndef BLACKMISC_COMPAREFUNCTIONS_H
#define BLACKMISC_COMPAREFUNCTIONS_H
#include "blackmisc/blackmiscexport.h"
#include <QDateTime>
#include <QtGlobal>
#include <type_traits>
template<typename Enum>
class QFlags;
namespace BlackMisc
{
namespace Compare
{
//! Compare bool
BLACKMISC_EXPORT int compare(bool a, bool b);
//! Compare arithmetic values
template <typename T, std::enable_if_t<std::is_arithmetic<T>::value, int> = 0>
int compare(T a, T b)
{
if (a < b) { return -1; }
if (b < a) { return 1; }
return 0;
}
//! Compare int
BLACKMISC_EXPORT int compare(int a, int b);
//! Compare enumerators
template <typename T, std::enable_if_t<std::is_enum<T>::value, int> = 0>
int compare(T a, T b)
{
using UT = std::underlying_type_t<T>;
return compare(static_cast<UT>(a), static_cast<UT>(b));
}
//! Compare uint
BLACKMISC_EXPORT int compare(uint a, uint b);
//! Compare QFlags
template <typename T>
int compare(QFlags<T> a, QFlags<T> b)
{
using UT = typename QFlags<T>::Int;
return compare(static_cast<UT>(a), static_cast<UT>(b));
}
//! Compare qint64
BLACKMISC_EXPORT int compare(qint64 a, qint64 b);
//! Compare double
BLACKMISC_EXPORT int compare(double a, double b);
//! Compare double
BLACKMISC_EXPORT int compare(const QDateTime &a, const QDateTime &b);
//! Compare dates
inline int compare(const QDateTime &a, const QDateTime &b)
{
return compare(a.toMSecsSinceEpoch(), b.toMSecsSinceEpoch());
}
} // ns
} // ns