static Operator()
{
Convert = ExpressionUtil.CreateExpression <TValue, TResult>(body => Expression.Convert(body, typeof(TResult)));
Add = ExpressionUtil.CreateExpression <TResult, TValue, TResult>(Expression.Add, true);
Subtract = ExpressionUtil.CreateExpression <TResult, TValue, TResult>(Expression.Subtract, true);
Multiply = ExpressionUtil.CreateExpression <TResult, TValue, TResult>(Expression.Multiply, true);
Divide = ExpressionUtil.CreateExpression <TResult, TValue, TResult>(Expression.Divide, true);
}
static Operator()
{
Add = ExpressionUtil.CreateExpression <T, T, T>(Expression.Add);
Subtract = ExpressionUtil.CreateExpression <T, T, T>(Expression.Subtract);
Divide = ExpressionUtil.CreateExpression <T, T, T>(Expression.Divide);
Multiply = ExpressionUtil.CreateExpression <T, T, T>(Expression.Multiply);
GreaterThan = ExpressionUtil.CreateExpression <T, T, bool>(Expression.GreaterThan);
GreaterThanOrEqual = ExpressionUtil.CreateExpression <T, T, bool>(Expression.GreaterThanOrEqual);
LessThan = ExpressionUtil.CreateExpression <T, T, bool>(Expression.LessThan);
LessThanOrEqual = ExpressionUtil.CreateExpression <T, T, bool>(Expression.LessThanOrEqual);
Equal = ExpressionUtil.CreateExpression <T, T, bool>(Expression.Equal);
NotEqual = ExpressionUtil.CreateExpression <T, T, bool>(Expression.NotEqual);
Negate = ExpressionUtil.CreateExpression <T, T>(Expression.Negate);
And = ExpressionUtil.CreateExpression <T, T, T>(Expression.And);
Or = ExpressionUtil.CreateExpression <T, T, T>(Expression.Or);
Not = ExpressionUtil.CreateExpression <T, T>(Expression.Not);
Xor = ExpressionUtil.CreateExpression <T, T, T>(Expression.ExclusiveOr);
Type typeT = typeof(T);
if (typeT.IsValueType && typeT.IsGenericType && (typeT.GetGenericTypeDefinition() == typeof(Nullable <>)))
{
// get the *inner* zero (not a null Nullable<TValue>, but default(TValue))
Type nullType = typeT.GetGenericArguments()[0];
Zero = (T)Activator.CreateInstance(nullType);
NullOp = (INullOp <T>)Activator.CreateInstance(typeof(StructNullOp <>).MakeGenericType(nullType));
}
else
{
Zero = default(T);
if (typeT.IsValueType)
{
NullOp = (INullOp <T>)Activator.CreateInstance(typeof(StructNullOp <>).MakeGenericType(typeT));
}
else
{
NullOp = (INullOp <T>)Activator.CreateInstance(typeof(ClassNullOp <>).MakeGenericType(typeT));
}
}
}
