Representation Clauses and Pragmas

• Alignment Clauses:
• Size Clauses:
• Storage_Size Clauses:
• Size of Variant Record Objects:
• Biased Representation :
• Value_Size and Object_Size Clauses:
• Component_Size Clauses:
• Bit_Order Clauses:
• Effect of Bit_Order on Byte Ordering:
• Pragma Pack for Arrays:
• Pragma Pack for Records:
• Record Representation Clauses:
• Enumeration Clauses:
• Address Clauses:
• Effect of Convention on Representation:
• Determining the Representations chosen by GNAT:

This section describes the representation clauses accepted by GNAT, and their effect on the representation of corresponding data objects.

GNAT fully implements Annex C (Systems Programming). This means that all the implementation advice sections in chapter 13 are fully implemented. However, these sections only require a minimal level of support for representation clauses. GNAT provides much more extensive capabilities, and this section describes the additional capabilities provided.