Macro field_accessor 

macro_rules! field_accessor {
    ($name:ident, $type:ty, $path:expr) => { ... };
}

Macro to define type-safe field accessors (LEGACY API)

Examples

// Simple field accessor
field_accessor!(TotalVolume, u64, "total_volume");

// Nested field accessor
field_accessor!(LastPrice, f64, "reserves.last_price");

// Usage with MetricsContext
ctx.get_field(TotalVolume)  // returns Option<u64>
ctx.set_field(TotalVolume, 1000)

DEPRECATED: Consider using the new field! macro instead:

ctx.get(&field!(entity, total_volume))  // Cleaner, no accessor struct needed
ctx.set(&field!(entity, total_volume), 1000)