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Add support for differing types in almost_equal

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This commit is contained in:
Danny Robson 2012-04-20 18:02:54 +10:00
parent 1627754b6a
commit 64dd72db85
1 changed files with 13 additions and 1 deletions
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12
maths.hpp
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@ -22,6 +22,7 @@
#include "annotations.hpp" #include "annotations.hpp"
#include <type_traits>
template <typename T> template <typename T>
T T
@ -62,13 +63,24 @@ almost_equal (const T &a, const T &b)
template <typename Ta, typename Tb> template <typename Ta, typename Tb>
typename std::enable_if<
std::is_arithmetic<Ta>::value && std::is_arithmetic<Tb>::value,
bool bool
>::type
almost_equal (const Ta &a, const Tb &b) { almost_equal (const Ta &a, const Tb &b) {
return almost_equal <decltype(a + b)> (static_cast<decltype(a + b)>(a), return almost_equal <decltype(a + b)> (static_cast<decltype(a + b)>(a),
static_cast<decltype(a + b)>(b)); static_cast<decltype(a + b)>(b));
} }
template <typename Ta, typename Tb>
typename std::enable_if<
!std::is_arithmetic<Ta>::value || !std::is_arithmetic<Tb>::value,
bool
>::type
almost_equal (const Ta &a, const Tb &b)
{ return a == b; }
const double PI = 3.141592653589793238462643; const double PI = 3.141592653589793238462643;
inline double inline double