cd install
cp -r * ${your_install_dir}/
export PATH=$PATH:${your_install_dir}/bin

wget https://github.com/ontio/ontology-wasm-cdt-cpp/blob/master/pkg/ontowasm-ubuntu18.04-amd64.deb?raw=true
dpkg -i ontowasm-ubuntu18.04-amd64.deb?raw=true
export PATH=$PATH:/ontowasm

mkdir workkdir; cd workdir
wget https://github.com/ontio/ontology-wasm-cdt-cpp/blob/master/docker/Dockerfile
docker built -t ontowasm .
docker run -it --rm -v /absolute/path/input_dir:/root/contracts ontowasm "/bin/bash"

//#define WASM_DEBUG_INTERFACE
#define WASM_LOCAL_DEBUG_OEP4
#include<ontiolib/ontio.hpp>
using namespace ontio;

class oep4 : public contract {
	key SUPPLY_KEY = pack(std::string("TotalSupply"));
	address OWNER = {0xe9,0x8f,0x49,0x98,0xd8,0x37,0xfc,0xdd,0x44,0xa5,0x05,0x61,0xf7,0xf3,0x21,0x40,0xc7,0xc6,0xc2,0x60};
	asset total = 1000000000;
	uint8_t balanceprfix = 0x1;

	public:
	using contract::contract;
	bool init(void) {
#ifdef WASM_LOCAL_DEBUG_OEP4
		printf("%s\n",__FUNCTION__);
#endif
		bool success = false;
		asset total_inner = 0;
#ifdef WASM_LOCAL_DEBUG_OEP4
		for(auto i: OWNER) { printf("%02x", i); }; printf("\n");
#endif
		if (check_witness(OWNER)) {
			if(storage_get(SUPPLY_KEY, total_inner)) {
#ifdef WASM_LOCAL_DEBUG_OEP4
				printf("already init. total = %lld\n", total_inner.amount);
#endif
				return success;
			} else {
#ifdef WASM_LOCAL_DEBUG_OEP4
				printf("start init. total %lld", total.amount);
#endif
				success = true;
				key key_owner = make_key(balanceprfix, OWNER);
#ifdef WASM_LOCAL_DEBUG_OEP4
				printf("key_owner: ");
				for(auto i: key_owner) { printf("%02x",i); }
				printf("\n");
#endif
				storage_put(SUPPLY_KEY, total);
				storage_put(key_owner, total);
				notify("init success hello world.");
				return success;
			}
		} else {
#ifdef WASM_LOCAL_DEBUG_OEP4
			printf("auth failed\n");
#endif
			success = false;
			return success;
		}
	}

	bool transfer(address from, address to, asset amount) {
#ifdef WASM_LOCAL_DEBUG_OEP4
		printf("%s\n",__FUNCTION__);
#endif
		bool success = true;
		bool failed = false;
		if (not check_witness(from)) {
#ifdef WASM_LOCAL_DEBUG_OEP4
			printf("transfer auth failed\n");
#endif
			return failed;
		}

		if (amount < 0)
			return failed;

		key fromkey = make_key(balanceprfix, from);
		asset frombalance = 0; 
		if (not storage_get(fromkey, frombalance))
			return failed;

		if (amount > frombalance)
			return failed;
		else if (amount == frombalance)
			storage_delete(fromkey);
		else {
			frombalance -= amount;
			storage_put(fromkey, frombalance);
		}

		key tokey = make_key(balanceprfix, to);
		asset tobalance = 0;
		storage_get(tokey, tobalance);

		tobalance += amount;
#ifdef WASM_LOCAL_DEBUG_OEP4
		printf("transfer amount : %lld\n", amount.amount);
#endif
		storage_put(tokey, tobalance);
		return failed;
	}

	asset balance(address addr) {
#ifdef WASM_LOCAL_DEBUG_OEP4
		printf("%s\n",__FUNCTION__);
		printf("get the balance of address: ");
		for(auto i: addr) { printf("%02x", i); }
		printf("\n");
#endif
		bool success = true;
		bool failed = false;
		asset mybalance = 0;
		key addr_key = make_key(balanceprfix, addr);
#ifdef WASM_LOCAL_DEBUG_OEP4
		printf("addr_key: ");
		for(auto i: addr_key) { printf("%02x",i); }
		printf("\n");
#endif
		if (not storage_get(addr_key, mybalance)) {
#ifdef WASM_LOCAL_DEBUG_OEP4
			printf("read failed\n");
#endif
			return -1;
		}
#ifdef WASM_LOCAL_DEBUG_OEP4
		printf("read success\n");
		printf("balance %lld\n", mybalance.amount);
#endif
		return mybalance;
	}
};

ONTIO_DISPATCH(oep4, (init)(transfer)(balance))

ont_c test.c
ont_c test.c -o test.wasm
ont_c oep4.cpp
ont_c oep4.cpp -o oep4.wasm