How to share a const in Rust?

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#1

How does one do something like this in Rust?

// file.c
char const * const strings[10] = {
    "str1", ...
}

// file.h
extern char const * const strings[10];

The reference mentions that constant items in Rust are not associated with a particular location in memory, but what if you do want to have it in memory?

#2

Use static with a constant initializer:

static STRINGS: [&str; 10] = [ "str0", "str1", ... ];
3 Likes
#3

Ah right, but it would need to be

pub static STRINGS: [&str; 10] = [ "str0", "str1", ... ];

Right?

#4

Yes, it needs pub to be shared outside the current module.

#5

Since static in C kind of means "private" I didn't even think of that.

#6

Would strings be in RAM though? I'd like the array to be stored in flash memory (embedded context).

#7

For ELF, they would be in the .rodata section. That might map to flash memory on your device, but I'm not sure.

2 Likes
#8

Cool, thanks :slight_smile:

#9

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