Macro write_consts 

macro_rules! write_consts {
    (public, $id_group:ident, $t:ty, $ids_data:expr) => { ... };
    (private, $id_group:ident, $t:ty, $ids_data:expr) => { ... };
}

Write a collection of constants with a common type.

Makes the constants available for import into the main crate via use_symbols.

Parameters

• public or private: whether to make the constants publicly visible after import with use_symbols.
• $id_group: the group alias by which these variables are referred when importing with use_symbols.
• $t: the (common) type of the static variables.
• $ids_data: The list of type &[(I, $t)] where $t is as above, and I is a type implementing Display, though most commonly String or &’static str. This is a list of identifiers for the constants paired with their values.

Notes

• Intended for stack-allocated data. For heap-allocated data, use write_fns instead.
• Rather than passing identifiers directly, they are passed as string (in fact Display-implementing) types. It is anticipated that this will be more convenient in the typical use cases of the write_Xs family of macros.