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Add support for comparison of Approx with strong typedefs

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closes #652
This commit is contained in:
Jonathan Coe 2016-05-12 19:18:44 +01:00 • committed by Martin Hořeňovský
parent 73872207db
commit c06afe438e
2 changed files with 93 additions and 0 deletions
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52
include/internal/catch_approx.hpp
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@ -13,6 +13,10 @@
#include <cmath>
#include <limits>
#if defined(CATCH_CPP11_OR_GREATER)
#include <type_traits>
#endif
namespace Catch {
namespace Detail {
@ -41,6 +45,53 @@ namespace Detail {
return approx;
}
#if defined(CATCH_CPP11_OR_GREATER)
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator == ( const T& lhs, Approx const& rhs ) {
// Thanks to Richard Harris for his help refining this formula
auto lhs_v = double(lhs);
return fabs( lhs_v - rhs.m_value ) < rhs.m_epsilon * (rhs.m_scale + (std::max)( fabs(lhs_v), fabs(rhs.m_value) ) );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator == ( Approx const& lhs, const T& rhs ) {
return operator==( rhs, lhs );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator != ( T lhs, Approx const& rhs ) {
return !operator==( lhs, rhs );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator != ( Approx const& lhs, T rhs ) {
return !operator==( rhs, lhs );
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator <= ( T lhs, Approx const& rhs )
{
return double(lhs) < rhs.m_value || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator <= ( Approx const& lhs, T rhs )
{
return lhs.m_value < double(rhs) || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator >= ( T lhs, Approx const& rhs )
{
return double(lhs) > rhs.m_value || lhs == rhs;
}
template <typename T, typename = typename std::enable_if<std::is_constructible<double, T>::value>::type>
friend bool operator >= ( Approx const& lhs, T rhs )
{
return lhs.m_value > double(rhs) || lhs == rhs;
}
#else
friend bool operator == ( double lhs, Approx const& rhs ) {
// Thanks to Richard Harris for his help refining this formula
return fabs( lhs - rhs.m_value ) < rhs.m_epsilon * (rhs.m_scale + (std::max)( fabs(lhs), fabs(rhs.m_value) ) );
@ -77,6 +128,7 @@ namespace Detail {
{
return lhs.m_value > rhs || lhs == rhs;
}
#endif
Approx& epsilon( double newEpsilon ) {
m_epsilon = newEpsilon;