Module ontio_std::prelude

The prelude module provides common data types in the contract, and introduces some functions in the rust core library.

Re-exports

pub use crate::contract::TransferParam;

pub use crate::types::Address;

pub use crate::types::H256;

Modules

v1	Experimental The first version of the prelude of alloc crate.
cmp	Functionality for ordering and comparison.
str	Unicode string slices.
string	A UTF-8–encoded, growable string.
vec	A contiguous growable array type with heap-allocated contents, written Vec<T>.

Macros

asm	Experimental Inline assembly.
bench	Experimental Attribute macro applied to a function to turn it into a benchmark test.
cfg_accessible	Experimental Keeps the item it's applied to if the passed path is accessible, and removes it otherwise.
concat_idents	Experimental Concatenates identifiers into one identifier.
format_args_nl	Experimental Same as format_args, but adds a newline in the end.
global_asm	Experimental Module-level inline assembly.
llvm_asm	Experimental LLVM-style inline assembly.
log_syntax	Experimental Prints passed tokens into the standard output.
test_case	Experimental An implementation detail of the #[test] and #[bench] macros.
trace_macros	Experimental Enables or disables tracing functionality used for debugging other macros.
Clone	Derive macro generating an impl of the trait Clone.
Copy	Derive macro generating an impl of the trait Copy.
Debug	Derive macro generating an impl of the trait Debug.
Default	Derive macro generating an impl of the trait Default.
Eq	Derive macro generating an impl of the trait Eq.
Hash	Derive macro generating an impl of the trait Hash.
Ord	Derive macro generating an impl of the trait Ord.
PartialEq	Derive macro generating an impl of the trait PartialEq.
PartialOrd	Derive macro generating an impl of the trait PartialOrd.
RustcDecodable	Unstable implementation detail of the rustc compiler, do not use.
RustcEncodable	Unstable implementation detail of the rustc compiler, do not use.
assert	Asserts that a boolean expression is true at runtime.
cfg	Evaluates boolean combinations of configuration flags at compile-time.
column	Expands to the column number at which it was invoked.
compile_error	Causes compilation to fail with the given error message when encountered.
concat	Concatenates literals into a static string slice.
env	Inspects an environment variable at compile time.
file	Expands to the file name in which it was invoked.
format	Creates a String using interpolation of runtime expressions.
format_args	Constructs parameters for the other string-formatting macros.
global_allocator	Attribute macro applied to a static to register it as a global allocator.
include	Parses a file as an expression or an item according to the context.
include_bytes	Includes a file as a reference to a byte array.
include_str	Includes a UTF-8 encoded file as a string.
line	Expands to the line number on which it was invoked.
module_path	Expands to a string that represents the current module path.
option_env	Optionally inspects an environment variable at compile time.
stringify	Stringifies its arguments.
test	Attribute macro applied to a function to turn it into a unit test.
vec	Creates a Vec containing the arguments.

Structs

Box	A pointer type for heap allocation.
I128
String	A UTF-8–encoded, growable string.
U128
Vec	A contiguous growable array type, written Vec<T> but pronounced 'vector'.

Enums

Option	The Option type. See the module level documentation for more.
Result	Result is a type that represents either success (Ok) or failure (Err).

Traits

AsMut	Used to do a cheap mutable-to-mutable reference conversion.
AsRef	Used to do a cheap reference-to-reference conversion.
Clone	A common trait for the ability to explicitly duplicate an object.
Copy	Types whose values can be duplicated simply by copying bits.
Default	A trait for giving a type a useful default value.
DoubleEndedIterator	An iterator able to yield elements from both ends.
Drop	Custom code within the destructor.
Eq	Trait for equality comparisons which are equivalence relations.
ExactSizeIterator	An iterator that knows its exact length.
Extend	Extend a collection with the contents of an iterator.
Fn	The version of the call operator that takes an immutable receiver.
FnMut	The version of the call operator that takes a mutable receiver.
FnOnce	The version of the call operator that takes a by-value receiver.
From	Used to do value-to-value conversions while consuming the input value. It is the reciprocal of Into.
Into	A value-to-value conversion that consumes the input value. The opposite of From.
IntoIterator	Conversion into an Iterator.
Iterator	An interface for dealing with iterators.
Ord	Trait for types that form a total order.
PartialEq	Trait for equality comparisons which are partial equivalence relations.
PartialOrd	Trait for values that can be compared for a sort-order.
Send	Types that can be transferred across thread boundaries.
Sized	Types with a constant size known at compile time.
Sync	Types for which it is safe to share references between threads.
ToString	A trait for converting a value to a String.
Unpin	Types that can be safely moved after being pinned.

Functions

drop	Disposes of a value.