Name of a constant given its value

Question

How do you get the name of a constant given its value ?

More specifically (and to get a more readable understanding), I\'m working with the crypto/tls packa

Answer 1

I am afraid that is not possible.
The constants are resolved at compile time and there is nothing in the reflect package that allows you to retrieve the name.

What I suggest is creating a map with the names:

var constLookup = map[uint16]string{
    tls.TLS_RSA_WITH_RC4_128_SHA:      `TLS_RSA_WITH_RC4_128_SHA`,
    tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA: `TLS_RSA_WITH_3DES_EDE_CBC_SHA`,
    ...
}