Provides the macros needed to write fvm contracts

Basic Usage

Macros can be used in contract for simplify contract preparation process， like this:

``` rust use fvmmacros::contract; use fvmmacros::storage; use fvmstd::collections::hypermap::HyperMap;

#[storage] pub struct SetHash { map: HyperMap, }

#[contract] impl SetHash { fn new() -> Self { Self { map: HyperMap::new() } }

 pub fn set_hash(&mut self, key: String, value: String) {
     self.map.insert(key, value);
 }

 pub fn get_hash(&mut self, key: String) -> &String {
     self.map.get(&key).unwrap()
 }

} ```

Contract Mode

Now write contract have two mode:

• normal mode

Contract with normal mode limited data storage format, and user can write contract more convenient. User can use all macros except advance_contract.

• advance mode

Contract with advance mode not limited data storage format, and it must open advance feature with fvm-std and 'fvm-macros' lib to use this mode. The execute speed of contract in this mode would be fast then the contract in normal mode.