IEEE 200X Fast Track Change Proposal

ID:      FT-29

Status:       Proposed
Proposed:     Jim Lewis jim@synthworks.com
Analyzed:     4-April-05
Resolved:     Date

Related issues:  
Relevant LRM sections:   11.2



Enhancement/Requirements:
-------------------------------------------------------- 
Include the following in the standard context:

  use std.textio.all ; 
  library ieee ; 



Analysis/LRM Changes
----------------------------

Modify Clause 11.2  Design Libraries
Currently it reads (approximately paragraph #7, middle of page 158):
----------------------------------------------------------------
Every design unit except package STANDARD is assumed to contain the 
following implicit context items as part of its context clause:

library STD, WORK ; use STD.STANDARD.all ;

Library logical name STD denotes the design library in which package 
STANDARD and package TEXTIO reside; these are the only standard packages 
defined by the language (see Clause 14). (The use clause makes 
all declarations within package STANDARD directly visible within the 
corresponding design unit; see 10.4).  Library logical name WORK denotes 
the current working library during a given analysis.

The library denoted by the library logical name STD contains no library 
units other than package STANDARD and package TEXTIO.


Change it so that it reads:  
----------------------------------------------------------------
Every design unit except package STANDARD and package TEXTIO is 
assumed to contain the following implicit context items as part of 
its context clause:

library STD, IEEE, WORK ; use STD.STANDARD.all ; use STD.TEXTIO.all ; 

The package TEXIO is assumed to contain the following implicit context
items as part of its context clause:  

library STD, WORK ; use STD.STANDARD.all ; 

Library logical name STD denotes the design library in which package 
STANDARD and package TEXTIO reside.  Library logical name WORK denotes 
the current working library during a given analysis.  Library logical 
name IEEE denotes the design library in which the packages 
std_logic_1164 and numeric_std reside.

The library denoted by the library logical name STD contains no library 
units other than package STANDARD and package TEXTIO.  

Recommendation:
----------------------------
This proposal comes with plus and minuses.
Pluses:  With std_logic_1164, numeric_std, and the new math packages 
having textio routines included in the packages, referencing std.textio 
implicitly gives a similar use model.  

Minuses:  By automatically including std.textio, the following names
may cause conflicts with other objects: text, side, width, and line.

Note, with FT-16, including these here may not be necessary since
they could also be included in a context clause.  

Resolution:
----------------------------
[To be performed by the 200X Fast Track Working Group]