Where is the char struct -​- operator defined in .NET?

Question

When I look at the documentation for the .NET Char Struct (here: https://learn.microsoft.com/en-us/dotnet/api/system.char), I can see the usual properties, methods, etc., as for any other Type defined in the .NET Framework.

I know that the char struct has a -- operator defined for it as I can do the following:

char current = 'b';
current--;   // current now holds the value a.

When looking at the Microsoft documentation I would expect to see an operator overloading definition which would look something like :

public static Char operator --(char character)
{
}

The problem is I don't see anything like that neither it is said which operator is overloaded for the type. For the char Type example, char has an operator overload for -- but not for - and I think it would be good to know where all the overloaded operators are documented rather than do trials and errors.

So my questions are: How can one know which operator is defined for which type? Is it somewhere else in the .NET API documentation that I have missed?

Answer 1

What you are looking for is described in the C# Language Specification. The Integral Types topic lists the char type as being one of the integral types.

The char type represents unsigned 16-bit integers with values between 0 and 65535. The set of possible values for the char type corresponds to the Unicode character set. Although char has the same representation as ushort, not all operations permitted on one type are permitted on the other.

Regarding the operators you need to look at the Prefix increment and decrement operators topic in he C# language specification.

Predefined ++ and -- operators exist for the following types: sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, decimal, and any enum type.