Crystal Programming Language Reference（202003）
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Type reflection

来源 Crystal 浏览 1 扫码 打印 2026-10-24 00:44:03
  • Type reflection
    • Type reflection

Type reflection

Type reflection

Crystal provides basic methods to do type reflection, casting and introspection.

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  • Introduction
  • Using the compiler
  • The shards command
  • Overview and Examples
    • Hello World!
    • HTTP Server
    • Command Line Application
  • Syntax and semantics
    • Comments
    • Literals
      • Nil
      • Bool
      • Integers
      • Floats
      • Char
      • String
      • Symbol
      • Array
      • Hash
      • Range
      • Regex
      • Tuple
      • NamedTuple
      • Proc
      • Command
    • Assignment
    • Local variables
    • Control expressions
      • Truthy and falsey values
      • if
        • As a suffix
        • As an expression
        • Ternary if
        • if var
        • if var.is_a?(…)
        • if var.responds_to?(…)
        • if var.nil?
        • if !
      • unless
      • case
      • while
        • break
        • next
      • until
      • &&
      • ||
    • Requiring files
    • Types and methods
      • Everything is an object
      • The Program
      • Classes and methods
        • new, initialize and allocate
        • Methods and instance variables
        • Type inference
        • Union types
        • Overloading
        • Default values and named arguments
        • Splats and tuples
        • Type restrictions
        • Return types
        • Method arguments
        • Operators
        • Visibility
        • Inheritance
          • Virtual and abstract types
        • Class methods
        • Class variables
        • finalize
      • Modules
      • Generics
      • Structs
      • Constants
      • Enums
      • Blocks and Procs
        • Capturing blocks
        • Proc literal
        • Block forwarding
        • Closures
      • alias
    • Exception handling
    • Type grammar
    • Type reflection
      • is_a?
      • nil?
      • responds_to?
      • as
      • as?
      • typeof
    • Macros
      • Macro methods
      • Hooks
      • Fresh variables
    • Annotations
      • Built-in annotations
    • Low-level primitives
      • pointerof
      • sizeof
      • instance_sizeof
      • offsetof
      • Uninitialized variable declaration
    • Compile-time flags
      • Cross-compilation
    • C bindings
      • lib
      • fun
        • out
        • to_unsafe
      • struct
      • union
      • enum
      • Variables
      • Constants
      • type
      • alias
      • Callbacks
    • Unsafe code
  • Conventions
    • Coding style
    • Documenting code
  • Database
    • Connection
    • Connection pool
    • Transactions
  • Guides
    • Performance
    • Concurrency
    • Testing
    • Writing Shards
      • Hosting on GitHub
      • Hosting on GitLab
    • Continuous Integration
      • Using Travis CI
      • Using CircleCI
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