魔豹Meta Force佛萨奇智能合约系统开发搭建

#include "vntlib.h"
KEY address owner;
KEY uint32 last_completed_migration;
constructor Migrations()
{
  owner = GetSender();
}

void onlyOwner()
{
  Require(Equal(owner, GetSender()), "is not owner");
}

MUTABLE
void setCompleted(uint32 completed)
{
  onlyOwner();
  last_completed_migration = completed;
}

UNMUTABLE
uint32 get_last_completed_migration()
{
  return last_completed_migration;
}

// Deploy a single contract without constructor arguments
deployer.deploy(A);

// Deploy a single contract with constructor arguments
deployer.deploy(A, arg1, arg2, ...);

// Don't deploy this contract if it has already been deployed
deployer.deploy(A, {overwrite: false});

// Set a maximum amount of gas and `from` address for the deployment
deployer.deploy(A, {gas: 4612388, from: "0x...."});

// External dependency example:
//
// For this example, our dependency provides an address when we're deploying to the
// live network, but not for any other networks like testing and development.
// When we're deploying to the live network we want it to use that address, but in
// testing and development we need to deploy a version of our own. Instead of writing
// a bunch of conditionals, we can simply use the `overwrite` key.
deployer.deploy(SomeDependency, {overwrite: false});