EOS智能合约内置数据类型

EOSIO为智能合约实现了许多内置类型（Built-in Types），内置类型无需在ABI的types字段中进行描述，EOSIO的内置类型定义在eos/libraries/chain/abi_serializer.cpp的configure_built_in_types函数中

这些内置数据类型可以分为8大类：整数、浮点数、时间、名称、字符、哈希算法、密钥和签名、资产。

整数

built_in_types.emplace("bool", pack_unpack<uint8_t>()); built_in_types.emplace("int8", pack_unpack<int8_t>()); built_in_types.emplace("uint8", pack_unpack<uint8_t>()); built_in_types.emplace("int16", pack_unpack<int16_t>()); built_in_types.emplace("uint16", pack_unpack<uint16_t>()); built_in_types.emplace("int32", pack_unpack<int32_t>()); built_in_types.emplace("uint32", pack_unpack<uint32_t>()); built_in_types.emplace("int64", pack_unpack<int64_t>()); built_in_types.emplace("uint64", pack_unpack<uint64_t>()); built_in_types.emplace("int128", pack_unpack<int128_t>()); built_in_types.emplace("uint128", pack_unpack<uint128_t>()); built_in_types.emplace("varint32", pack_unpack<fc::signed_int>()); built_in_types.emplace("varuint32", pack_unpack<fc::unsigned_int>());

EOSIO配置了13种整数内置类型，实际是12种（bool和uint8都是uint8_t类型），如下表

signed_int和unsigned_int是可变长度类型（varint | varuint），使用尽可能少的字节序列化32位整型和无符号整型。

浮点数

built_in_types.emplace("float32", pack_unpack<float>()); built_in_types.emplace("float64", pack_unpack<double>()); built_in_types.emplace("float128", pack_unpack<float128_t>());

EOSIO配置了3种浮点数内置类型，如下表

时间

built_in_types.emplace("time_point", pack_unpack<fc::time_point>()); built_in_types.emplace("time_point_sec", pack_unpack<fc::time_point_sec>()); built_in_types.emplace("block_timestamp_type", pack_unpack<block_timestamp_type>());

EOSIO配置了3种时间内置类型，如下表

名称

built_in_types.emplace("name", pack_unpack<name>());

EOSIO配置了1种名称内置类型，如下表

字符

built_in_types.emplace("bytes", pack_unpack<bytes>()); built_in_types.emplace("string", pack_unpack<string>());

EOSIO配置了2种字符内置类型，如下表

哈希算法

built_in_types.emplace("checksum160", pack_unpack<checksum160_type>()); built_in_types.emplace("checksu**56", pack_unpack<checksu**56_type>()); built_in_types.emplace("checksum512", pack_unpack<checksum512_type>());

EOSIO配置了3种哈希算法内置类型，如下表

密钥和签名

built_in_types.emplace("public_key", pack_unpack_deadline<public_key_type>()); built_in_types.emplace("signature", pack_unpack_deadline<signature_type>());

EOSIO配置了2种密钥和签名内置类型，如下表

资产

built_in_types.emplace("symbol", pack_unpack<symbol>()); built_in_types.emplace("symbol_code", pack_unpack<symbol_code>()); built_in_types.emplace("asset", pack_unpack<asset>()); built_in_types.emplace("extended_asset", pack_unpack<extended_asset>());

EOSIO配置了4种资产内置类型，如下表

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编译者/作者：松果

玩币圈申明：玩币圈作为开放的资讯翻译/分享平台，所提供的所有资讯仅代表作者个人观点，与玩币圈平台立场无关，且不构成任何投资理财建议。文章版权归原作者所有。