public static IComparer <TSelf> Create <TSelf, TEpsilon>(TEpsilon epsilon)
{
if (typeof(TSelf) == typeof(double) && typeof(TEpsilon) == typeof(double))
{
return((IComparer <TSelf>) new DoubleComparer((double)(object)epsilon));
}
var epsilonSubMethod = typeof(TSelf).GetTypeInfo()
.GetMethod("op_Subtraction", new [] { typeof(TSelf), typeof(TSelf) });
if (epsilonSubMethod == null)
{
throw SpecFailure.BadEpsilonComparerTypes(typeof(TSelf));
}
var epsilonType = epsilonSubMethod.ReturnType;
if (epsilonType == typeof(TSelf))
{
return(new ReflectedEpsilonComparer <TSelf>((TSelf)(object)epsilon));
}
var type = typeof(ReflectedEpsilonComparer <,>).MakeGenericType(typeof(TSelf), epsilonType);
return((IComparer <TSelf>)Activator.CreateInstance(type, epsilon));
}
