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# Features Overview

Navigate D's implementation of a few key programming language concepts.

- Garbage Collection
- Functions
  - Function Delegates
  - Function Overloading
  - out parameters for functions
  - Nested functions
  - Function literals
  - Closures
  - Typesafe variadic arguments
  - Lazy function argument evaluation
  - Compile time function evaluation
  - Uniform Function Call Syntax
  - User-Defined Attributes
- Arrays
  - Lightweight arrays
  - Resizeable arrays
  - Built-in strings
  - Array slicing
  - Array bounds checking
  - Array literals
  - Associative arrays
  - String switches
  - Aliases
- OOP
  - Object Orientation
  - Interfaces
  - Single inheritance of implementation/multiple inheritance of interfaces
  - Operator overloading
  - Modules
  - No built-in dynamic class loading
  - Nested classes
  - Inner (adaptor) classes
  - Covariant return types
  - Properties
- Performance
  - Inline assembler
  - Direct access to hardware
  - Lightweight objects
  - Explicit memory allocation control
  - Independent of VM
  - Direct native code gen
- Generic Programming
  - Class Templates
  - Function Templates
  - Implicit Function Template Instantiation
  - Partial and Explicit Specialization
  - Value Template Parameters
  - Template Template Parameters
  - Variadic Template Parameters
  - Template Constraints
  - Mixins
  - static if
  - expressions
  - typeof
  - foreach
  - Implicit Type Inference
- Reliability
  - Contract Programming
  - Unit testing
  - Static construction order
  - Guaranteed initialization
  - RAII (automatic destructors)
  - Exception handling
  - Scope guards
  - try-catch-finally blocks
  - Thread synchronization primitives
- Compatibility
  - C-like syntax
  - Enumerated types
  - Support for all C types
  - 80 bit floating point
  - Complex and Imaginary
  - Direct access to C
  - Use existing debuggers
  - Struct member alignment control
  - Generates standard object files
  - Obviates need for a macro text preprocessor
- Other
  - Conditional compilation
  - Unicode source text
  - Documentation comments

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