MoveText < P1076/Ballots

P1076/Ballots Web>Vhdl2019CollectedRequirements>MoveText (2020-02-17, JimLewis) (raw view)EditAttach
---+ Move std.textio.TEXT, OUTPUT, and INPUT

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---++ Proposal Information
   * Who Updates: Main.JimLewis, Needs Champion
   * Date Proposed: 2014-03-23
   * Date Last Updated: 2014-03-23
   * Priority:
   * Complexity:
   * Focus: General Language

---++ Related Issues: None
---++ Competing Issues: None
---++ Summary

[[https://bugzilla.mentor.com/show_bug.cgi?id=257][See Bugzilla 257]] In the VHDL LRM, IEEE-1076-2008, under 5.5.2 File operations there is a write procedure defined as follows:

<verbatim>procedure WRITE (file F: FT; VALUE: in TM);</verbatim>

When I try to call this as follows:
<verbatim>write(std.textio.OUTPUT, integer'image(i) & LF ) ;</verbatim>

I get an error:
<verbatim># ** Error: for_subtype.vhd(17): Unknown identifier "write".</verbatim>

It appears that although there is a reference to std.textio.output, that the type text is not also visible. When I add the following use clause to make text visible, then the problem goes away.
<verbatim>use std.textio.text ;</verbatim>

It would be nice to be able to use write without having to use package textio, however, this means that we need file type declarations for file of string and we need a file open for OUTPUT.

We could add new definitions in package std.standard, however, if we could move the definitions for TEXT, OUTPUT, and INPUT from std.textio to std.standard and replace the definitions in std.textio with aliases (like what we did with ieee.std_logic_textio), we could avoid having two things that mean the same thing.

---++ Use cases

---++ Language impact

---++ Non-supporters

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---++ Supporters

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Topic revision: r3 - 2020-02-17 - 15:34:56 - JimLewis
P1076/Ballots