If you convert from double to decimal, you can lose information – the number may be completely out of range, as the range of a double is much larger than the range of a decimal. If you convert from decimal to double, you can lose information – for example, 0.1 is exactly representable in decimal … Read more
Assuming your native code is enum shape_type_e { stUNHANDLED = 0, //!< Unhandled shape data. stPOINT = 1 //!< Point data. … }; and your managed code is public enum class ShapeType { Unhandled = 0, Point = 1, … }; You can cast from the native to the managed using shape_type_e nativeST = stPOINT; … Read more
So the way to fix this which took me an annoyingly long time to find is to use the derived cast method described here. Now the definition is this: internal::cast_return_type<Derived,const CwiseUnaryOp<internal::scalar_cast_op<typenameinternal::traits<Derived>::Scalar, NewType>, const Derived> >::type cast() const Which Ill admit, phased me a little. But turns out it is pretty easy (and the only explanation … Read more
int(limit) returns the value converted into an integer, and doesn’t change it in place as you call the function (which is what you are expecting it to). Do this instead: limit = int(limit) Or when definiting limit: if ‘limit’ in user_data : limit = int(user_data[‘limit’])
An expression in an index declaration should be enclosed in additional brackets, try: CREATE INDEX event_creation_time_date_idx ON event ((creation_time::DATE));
If a field allows nulls, don’t use regular primitive types. Use the C# nullable type and the as keyword. int? field_a = reader[“field_a”] as int?; string field_b = reader[“field_a”] as string; Adding a ? to any non-nullable C# type makes it “nullable”. Using the as keyword will attempt to cast an object to the specified … Read more
If you encounter a custom class that explicitly raises an exception in __str__ (or __repr__ if __str__ is not defined). Or, for example a class that returns a bytes object from __str__: class Foo: def __str__(self): return b” str(Foo()) # TypeError: __str__ returned non-string (type bytes) But personally, I have never seen this and I’m … Read more
Yes, it’s possible to cast Enum to int and vice versa, because every Enum is actually represented by an int per default. You should manually specify member values. By default it starts from 0 to N. It’s also possible to cast Enum to string and vice versa. public enum MyEnum { Value1 = 1, Value2 … Read more
int i = 1234; char[] chars = (“” + i).toCharArray();
The n in varchar(n) is the number of characters, not bytes. The manual: SQL defines two primary character types: character varying(n) and character(n), where n is a positive integer. Both of these types can store strings up to n characters (not bytes) in length. Bold emphasis mine. Use left() to “truncate” a string to a … Read more