Module prelude

The gstd default prelude. Re-imports default std modules and traits. std can be safely replaced to gstd in the Rust programs.

Re-exports

• pub use crate::ReservationIdExt;
• pub use parity_scale_codec as codec;
• pub use scale_info;

Modules

• any
  Utilities for dynamic typing or type reflection.
• array
  Utilities for the array primitive type.
• ascii
  Operations on ASCII strings and characters.
• borrow
  A module for working with borrowed data.
• boxed
  The Box<T> type for heap allocation.
• cell
  Shareable mutable containers.
• char
  Utilities for the char primitive type.
• clone
  The Clone trait for types that cannot be ‘implicitly copied’.
• cmp
  Utilities for comparing and ordering values.
• collections
  Collection types.
• convert
  Traits for conversions between types.
• default
  The Default trait for types with a default value.
• ffi
  Utilities related to FFI bindings.
• fmt
  Utilities for formatting and printing Strings.
• future
  Asynchronous basic functionality.
• hash
  Generic hashing support.
• hint
  Hints to compiler that affects how code should be emitted or optimized.
• iter
  Composable external iteration.
• marker
  Primitive traits and types representing basic properties of types.
• mem
  Basic functions for dealing with memory.
• num
  Numeric traits and functions for the built-in numeric types.
• ops
  Overloadable operators.
• option
  Optional values.
• panic
  Panic support in the standard library.
• pin
  Types that pin data to a location in memory.
• primitive
  This module reexports the primitive types to allow usage that is not possibly shadowed by other declared types.
• ptr
  Manually manage memory through raw pointers.
• rc
  Single-threaded reference-counting pointers. ‘Rc’ stands for ‘Reference Counted’.
• result
  Error handling with the Result type.
• slice
  Slice management and manipulation.
• str
  Utilities for the str primitive type.
• string
  A UTF-8–encoded, growable string.
• task
  Types and Traits for working with asynchronous tasks.
• time
  Temporal quantification.
• vec
  A contiguous growable array type with heap-allocated contents, written Vec<T>.

Macros

• assert
  Asserts that a boolean expression is true at runtime.
• assert_eq
  Asserts that two expressions are equal to each other (using PartialEq).
• assert_ne
  Asserts that two expressions are not equal to each other (using PartialEq).
• 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.
• dbg
  Prints and returns the value of a given expression for quick and dirty debugging.
• debug_assert
  Asserts that a boolean expression is true at runtime.
• debug_assert_eq
  Asserts that two expressions are equal to each other.
• debug_assert_ne
  Asserts that two expressions are not equal to each other.
• 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.
• 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.
• matches
  Returns whether the given expression matches the provided pattern.
• module_path
  Expands to a string that represents the current module path.
• option_env
  Optionally inspects an environment variable at compile time.
• panic
  Panics the current thread.
• stringify
  Stringifies its arguments.
• todo
  Indicates unfinished code.
• unimplemented
  Indicates unimplemented code by panicking with a message of “not implemented”.
• unreachable
  Indicates unreachable code.
• vec
  Creates a Vec containing the arguments.
• write
  Writes formatted data into a buffer.
• writeln
  Writes formatted data into a buffer, with a newline appended.
• concat_bytesExperimental
  Concatenates literals into a byte slice.
• concat_identsExperimental
  Concatenates identifiers into one identifier.
• derefExperimental
  Unstable placeholder for deref patterns.
• format_args_nlExperimental
  Same as format_args, but adds a newline in the end.
• log_syntaxExperimental
  Prints passed tokens into the standard output.
• trace_macrosExperimental
  Enables or disables tracing functionality used for debugging other macros.
• type_ascribeExperimental
  Unstable placeholder for type ascription.

Structs

• Box
  A pointer type that uniquely owns a heap allocation of type T.
• String
  A UTF-8–encoded, growable string.
• Vec
  A contiguous growable array type, written as Vec<T>, short for ‘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.
• Decode
  Trait that allows zero-copy read of value-references from slices in LE format.
• 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.
• Encode
  Trait that allows zero-copy write of value-references to slices in LE format.
• EncodeLike
  A marker trait that tells the compiler that a type encode to the same representation as another type.
• Eq
  Trait for comparisons corresponding to 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.
• FromIterator
  Conversion from an Iterator.
• Into
  A value-to-value conversion that consumes the input value. The opposite of From.
• IntoIterator
  Conversion into an Iterator.
• Iterator
  A trait for dealing with iterators.
• MaxEncodedLen
  Items implementing MaxEncodedLen have a statically known maximum encoded size.
• Ord
  Trait for types that form a total order.
• PartialEq
  Trait for comparisons using the equality operator.
• PartialOrd
  Trait for types that form a partial 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.
• ToOwned
  A generalization of Clone to borrowed data.
• ToString
  A trait for converting a value to a String.
• TryFrom
  Simple and safe type conversions that may fail in a controlled way under some circumstances. It is the reciprocal of TryInto.
• TryInto
  An attempted conversion that consumes self, which may or may not be expensive.
• TypeInfo
  Implementors return their meta type information.
• Unpin
  Types that do not require any pinning guarantees.

Functions

• align_of
  Returns the ABI-required minimum alignment of a type in bytes.
• align_of_val
  Returns the ABI-required minimum alignment of the type of the value that val points to in bytes.
• drop
  Disposes of a value.
• size_of
  Returns the size of a type in bytes.
• size_of_val
  Returns the size of the pointed-to value in bytes.

Attribute Macros

• derive
  Attribute macro used to apply derive macros.
• global_allocator
  Attribute macro applied to a static to register it as a global allocator.
• test
  Attribute macro applied to a function to turn it into a unit test.
• alloc_error_handlerExperimental
  Attribute macro applied to a function to register it as a handler for allocation failure.
• benchExperimental
  Attribute macro applied to a function to turn it into a benchmark test.
• cfg_accessibleExperimental
  Keeps the item it’s applied to if the passed path is accessible, and removes it otherwise.
• cfg_evalExperimental
  Expands all #[cfg] and #[cfg_attr] attributes in the code fragment it’s applied to.
• derive_constExperimental
  Attribute macro used to apply derive macros for implementing traits in a const context.
• test_caseExperimental
  An implementation detail of the #[test] and #[bench] macros.

Derive 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.
• Decode
  Derive parity_scale_codec::Decode for struct and enum.
• Default
  Derive macro generating an impl of the trait Default.
• Encode
  Derive parity_scale_codec::Encode and parity_scale_codec::EncodeLike for struct and enum.
• Eq
  Derive macro generating an impl of the trait Eq.
• Hash
  Derive macro generating an impl of the trait Hash.
• MaxEncodedLen
  Derive parity_scale_codec::MaxEncodedLen for struct and enum.
• Ord
  Derive macro generating an impl of the trait Ord. The behavior of this macro is described in detail here.
• PartialEq
  Derive macro generating an impl of the trait PartialEq. The behavior of this macro is described in detail here.
• PartialOrd
  Derive macro generating an impl of the trait PartialOrd. The behavior of this macro is described in detail here.
• TypeInfo