# SimpleConversionService constructor

SimpleConversionService([

1. ProtectionDomain? pd

])

Creates a new SimpleConversionService.

Parameters:

- `pd`: Optional protection domain for security (defaults to current)

Example:

    // Basic instantiation
    final service = SimpleConversionService();

    // With custom protection domain
    final secureService = SimpleConversionService(myProtectionDomain);

A comprehensive type conversion service that handles conversion between different types.

This service provides:

- Registration of converters and converter factories
- Type conversion with null safety
- Caching for improved performance
- Support for primitive type conversions
- Optional type handling

{@template conversion_service_features}

## Key Features

- Converter registration and management
- Type hierarchy-aware conversion
- Null safety and primitive type handling
- Converter caching for performance
- Optional type support

## Implementation

    SimpleConversionService([ProtectionDomain? pd]) : _pd = pd ?? ProtectionDomain.system() {
      _nullConverters.add(_DefaultNullConverter());
    }