static ReflectionInfos()
{
GetTypeFromHandle = GetFuncCall(() => Type.GetTypeFromHandle(typeof(Type).TypeHandle));
CompareInner = GetFuncCall(() => DeepComparer.Compare(default(object), default(object), default(CompareContext))).GetGenericMethodDefinition();
Skip = typeof(CompareContext).GetMethod(nameof(CompareContext.Skip));
CopyArrayRank1 = GetFuncCall(() => ArrayComparer.CopyArrayRank1(default(object[]), default(object[]), default(CompareContext))).GetGenericMethodDefinition();
CopyArrayRank2 = GetFuncCall(() => ArrayComparer.CopyArrayRank2(default(object[, ]), default(object[, ]), default(CompareContext))).GetGenericMethodDefinition();
// ReSharper disable once EqualExpressionComparison
ReferenceEquals = GetFuncCall(() => ReferenceEquals(default(object), default(object)));
ConvertDelegate = typeof(ReflectionInfos).GetMethod(nameof(_ConvertDelegate), BindingFlags.Static | BindingFlags.NonPublic);
MethodInfo GetFuncCall <T>(Expression <Func <T> > expression)
{
return((expression.Body as MethodCallExpression)?.Method
?? throw new ArgumentException("Expression type unsupported."));
}
}
internal static bool CopyArray <T>(T x, T y, CompareContext context)
{
if (ReferenceEquals(x, y))
{
return(true);
}
var xArray = x as Array;
if (xArray == null)
{
throw new InvalidCastException($"Cannot cast non-array type {x?.GetType()} to Array.");
}
var yArray = y as Array;
if (yArray == null)
{
throw new InvalidCastException($"Cannot cast non-array type {y?.GetType()} to Array.");
}
var rank = xArray.Rank;
if (rank != yArray.Rank)
{
return(false);
}
var lengths = new int[rank];
for (var i = 0; i < rank; i++)
{
var length = xArray.GetLength(i);
if (length != yArray.GetLength(i))
{
return(false);
}
lengths[i] = length;
}
var index = new int[rank];
var sizes = new int[rank];
sizes[rank - 1] = 1;
for (var k = rank - 2; k >= 0; k--)
{
sizes[k] = sizes[k + 1] * lengths[k + 1];
}
for (var i = 0; i < xArray.Length; i++)
{
var k = i;
for (var n = 0; n < rank; n++)
{
var offset = k / sizes[n];
k = k - offset * sizes[n];
index[n] = offset;
}
var xItem = xArray.GetValue(index);
var yItem = yArray.GetValue(index);
if (context.Skip(xItem, yItem) == false)
{
var result = DeepComparer.Compare(xItem, yItem, context);
if (result == false)
{
return(false);
}
}
}
return(true);
}