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conversions are mostly cleaned up; bring the spec in line.

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R=gri
DELTA=31  (12 added, 18 deleted, 1 changed)
OCL=25974
CL=25976
This commit is contained in:
Rob Pike 2009-03-09 22:35:06 -07:00
parent efbb120d8e
commit ef1b9653dd
1 changed files with 13 additions and 19 deletions
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32
doc/go_spec.html
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@ -3,13 +3,6 @@
<!--
Biggest open issues:
[ ] General iterators
[ ] Conversions:
- current situation is messy
- 2 (3?) different notations for the same thing
- unclear when a type assertion is needed
- unclear where conversions can be applied
- for type T int; can we say T(3.0) ?
- do we need channel conversion (channel direction)
[ ] Semantics of type declaration:
- creating a new type (status quo), or only a new type name?
- also: declaration type T S; strips methods of S. why/why not?
@ -21,7 +14,6 @@ Decisions in need of integration into the doc:
Todo's:
[ ] there is some funny-ness regarding ';' and empty statements and label decls
[ ] document illegality of package-external tuple assignments to structs
w/ private fields: P.T(1, 2) illegal since same as P.T(a: 1, b: 2) for
a T struct { a b int }.
@ -46,11 +38,7 @@ Wish list:
Smaller issues:
[ ] need for type switch? (or use type assertion with ok in tuple assignment?)
[ ] Is . import implemented / do we still need it?
[ ] Do we allow empty statements? If so, do we allow empty statements after a label?
and if so, does a label followed by an empty statement (a semicolon) still denote
a for loop that is following, and can break L be used inside it?
[ ] do we need channel conversion (channel direction)
Closed:
@ -125,6 +113,18 @@ Closed:
[x] should binary <- be at lowest precedence level? when is a send/receive non-blocking? (NO - 9/19/08)
[x] func literal like a composite type - should probably require the '&' to get address (NO)
[x] & needed to get a function pointer from a function? (NO - there is the "func" keyword - 9/19/08)
[x] Conversions:
- current situation is messy
- 2 (3?) different notations for the same thing
- unclear when a type assertion is needed
- unclear where conversions can be applied
- for type T int; can we say T(3.0) ?
[x] need for type switch? (or use type assertion with ok in tuple assignment?)
[x] Is . import implemented / do we still need it?
[x] Do we allow empty statements? If so, do we allow empty statements after a label?
and if so, does a label followed by an empty statement (a semicolon) still denote
a for loop that is following, and can break L be used inside it?
[x] there is some funniness regarding ';' and empty statements and label decls
-->
@ -3643,8 +3643,6 @@ space allocated in the underlying array (for a slice) or map. For a slice
<h3>Conversions</h3>
<p>
<font color=red>TODO: We need to finalize the details of conversions.</font>
<br/>
Conversions look like function calls of the form
</p>
@ -4183,15 +4181,11 @@ The following minimal alignment properties are guaranteed:
<font color=red>
Implementation accepts only ASCII digits for digits; doc says Unicode.
<br/>
Implementation does not allow p.x where p is the local package name.
<br/>
Implementation does not honor the restriction on goto statements and targets (no intervening declarations).
<br/>
cap() does not work on maps or chans.
<br/>
len() does not work on chans.
<br/>
Conversions work for any type; doc says only numeric types and strings.
</font>
</p>