I liked nested functions in Pascal, and put them in D. They turn out to be surprisingly useful:
1. Properly encapsulating their scope, as opposed to having static functions sit awkwardly somewhere else.
2. Factoring out common code within the function.
3. A lot of my need for goto statements vanished with nested functions.
4. Take the address of a nested function, and it serves as a lambda.
5. No need to create "Context" structs to pass local data to them.
6. They replace a lot of what C macros did.
7. They're inlineable, so are not costly.
I use them more and more as time goes by. It's a pity C doesn't have them, they'd fit nicely into the language.
1. Properly encapsulating their scope, as opposed to having static functions sit awkwardly somewhere else.
2. Factoring out common code within the function.
3. A lot of my need for goto statements vanished with nested functions.
4. Take the address of a nested function, and it serves as a lambda.
5. No need to create "Context" structs to pass local data to them.
6. They replace a lot of what C macros did.
7. They're inlineable, so are not costly.
I use them more and more as time goes by. It's a pity C doesn't have them, they'd fit nicely into the language.