Types¶

ENI Types¶

These types are provided to be coherent with primitive types of Lity (Solidity).

ENI Integers¶

All integer types in ENI is implemented using boost::multiprecision::number. Some of them are aliases for types predefined in boost::multiprecision::cpp_int.

Integer Type	Size (bits)	Signed	Note
`eni::s256`	256	✔	Alias for `boost::multiprecision::int256_t`.
`eni::Int`	256	✔	Alias for `eni::s256`.
`eni::u256`	256	✘	Alias for `boost::multiprecision::uint256_t`.
`eni::u160`	160	✘	Size of an Ethereum address.
`eni::u128`	128	✘	Alias for `boost::multiprecision::uint128_t`.
`eni::u64`	64	✘
`eni::UInt`	256	✘	Alias for `eni::u256`.

Operations on ENI Integers¶

See the documentation for boost::multiprecision::number for supported operations.

Suggested Use of ENI Integers¶

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ENI Boolean¶

eni::Bool is an alias for C++ bool.

ENI Address¶

eni::Address is an alias for eni::u160 (20 bytes, size of an Ethereum address).

Convert ENI Types to C++ String¶

eni::to_string uses boost::lexical_cast internally to convert ENI types to std::string.

All ENI integers, eni::Bool, eni::Address are supported.

std::string to_string(eni::TypeName);

Usage¶

eni::Int int32max(2147483647);
std::string s = eni::to_string(int32max); // "2147483647"

eni::Bool bTrue(true);
std::string t = eni::to_string(bTrue);    // "true"

Abstract Data Types¶

See eni::Vector and eni::StringMap.

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JSON Types¶

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