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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 Jonathan B. Coe
parent 37e1e24309
commit 5a9072d01e
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 <cmath>
#include <limits> #include <limits>
#if defined(CATCH_CPP11_OR_GREATER)
#include <type_traits>
#endif
namespace Catch { namespace Catch {
namespace Detail { namespace Detail {
@ -41,6 +45,53 @@ namespace Detail {
return approx; 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 ) { friend bool operator == ( double lhs, Approx const& rhs ) {
// Thanks to Richard Harris for his help refining this formula // 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) ) ); 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; return lhs.m_value > rhs || lhs == rhs;
} }
#endif
Approx& epsilon( double newEpsilon ) { Approx& epsilon( double newEpsilon ) {
m_epsilon = newEpsilon; m_epsilon = newEpsilon;

41
projects/SelfTest/ApproxTests.cpp
View File

@ -140,3 +140,44 @@ TEST_CASE( "Approximate PI", "[Approx][PI]" )
REQUIRE( divide( 22, 7 ) == Approx( 3.141 ).epsilon( 0.001 ) ); REQUIRE( divide( 22, 7 ) == Approx( 3.141 ).epsilon( 0.001 ) );
REQUIRE( divide( 22, 7 ) != Approx( 3.141 ).epsilon( 0.0001 ) ); REQUIRE( divide( 22, 7 ) != Approx( 3.141 ).epsilon( 0.0001 ) );
} }
////////////////////////////////////////////////////////////////////////////////
#if defined(CATCH_CPP11_OR_GREATER)
class StrongDoubleTypedef
{
double d_ = 0.0;
public:
explicit StrongDoubleTypedef(double d) : d_(d) {}
explicit operator double() const { return d_; }
};
TEST_CASE
(
"Comparison with explicitly convertible types",
"[Approx]"
)
{
StrongDoubleTypedef td(10.0);
REQUIRE(td == Approx(10.0));
REQUIRE(Approx(10.0) == td);
REQUIRE(td != Approx(11.0));
REQUIRE(Approx(11.0) != td);
REQUIRE(td <= Approx(10.0));
REQUIRE(td <= Approx(11.0));
REQUIRE(Approx(10.0) <= td);
REQUIRE(Approx(9.0) <= td);
REQUIRE(td >= Approx(9.0));
REQUIRE(td >= Approx(10.0));
REQUIRE(Approx(10.0) >= td);
REQUIRE(Approx(11.0) >= td);
}
#endif
////////////////////////////////////////////////////////////////////////////////