Ada Programming/Keywords/use

Keywords use __TOC__ Use clause There are two versions of use clauses, a use_package_clause and a use_type_clause. At library level This use_package_clause makes the content of a package directly visible. If applied on the library level, its scope is the complete library unit. A use clause never hides anything that is already directly visible without it. All use clauses in effect in a certain scope act on the same level: Two homographs in different packages must still be named as selected components. with Ada Text_IO; use Ada Text_IO; procedure Hello is begin Put_Line("Hello, world!"); New_Line; Put_Line("I am an Ada program with package use."); end Hello; If readability is your main concern then you should avoid this kind of use clause. Either make it more local or use a use_type_clause. At declaration level The effect is the same as above, but the scope is the directly enclosing declaration region. hello_world_3.adb with Ada Text_IO; procedure Hello is use Ada Text_IO; begin Put_Line("Hello, world!"); New_Line; Put_Line("I am an Ada program with package use."); end Hello; For types Use type clauses come in two versions. use type Type_Name; makes the operators of the type directly visible. use all type Type_Name; makes the primitive operations of the type directly visible. Representation clauses The keywords for, use and at are used for representation clauses. A record representation clause specifies the Layout aspect of a record. An enumeration representation clause specifies the Coding aspect of an enumeration type. See Ada Programming/Representation_clauses. See also Wikibook Ada Programming Ada Programming/Keywords Ada Reference Manual 2 9 Reserved Words P (informative) Syntax Summary 8 3 Visibility 8 4 Use Clauses 13 3 Operational and Representation Attributes 13 4 Enumeration Representation Clauses 13 5 1 Record Representation Clauses Ada Quality and Style Guide 3 1 3 Capitalization Use Keywords:use