Benefits of this approach

No global variables

• all lookup table are encapsulated in the singleton
• Thread safe initialization (static local variable)
• clean namespace without pollution

Efficient memory Usage

• single instance of lookup tables shared
• Easy to extend with new tables
• no repeated initlaization overhead

Maintainable design

• all realated data grouped in one structure
• Easy to extend with new table types
• Clear ownership and lifetime management

Extension Example

Adding a new format

// In get_parser_tables() initialization  
tables.char_class_table['='] |= CHAR_FLAG;  // Center align
tables.flag_table['='] = flag_center_align;

Adding custom formatting flags:

// In get_parser_tables() initialization  
tables.char_class_table['='] |= CHAR_FLAG;  // Center align
tables.flag_table['='] = flag_center_align;

This desing maintains all the performance benefits of the pointer table approach while ensuring clean, maintainable code without global state pollution. The single patter thread safety and efficient ressource usage