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- be even more explicit about ideal number conversion in expressions

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- added a note with respect the difference of semantics of *p++ in Go vs C

R=r
DELTA=14  (6 added, 2 deleted, 6 changed)
OCL=17455
CL=17457
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Robert Griesemer 2008-10-20 11:46:40 -07:00
parent 6440c59e22
commit a6b546fe31
1 changed files with 12 additions and 8 deletions
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20
doc/go_spec.txt
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@ -4,7 +4,7 @@ The Go Programming Language Specification (DRAFT)
Robert Griesemer, Rob Pike, Ken Thompson
----
(October 15, 2008)
(October 20, 2008)
This document is a semi-formal specification of the Go systems
@ -1135,7 +1135,7 @@ other field within the struct.
Fields and methods (§Method declarations) of an anonymous field become directly
accessible as fields and methods of the struct without the need to provide the
type name of the respective anonymous field (§TODO).
type name of the respective anonymous field (§Selectors).
Forward declaration:
A struct type consisting of only the reserved word "struct" may be used in
@ -1709,17 +1709,21 @@ Operators combine operands into expressions.
The operand types in binary operations must be equal, with the following exceptions:
- The right operand in a shift operation must be
an unsigned int (§Arithmetic operators).
- Otherwise, ideal number operands are
converted to match the type of the other operand (§Expression).
- If one operand has numeric type and the other operand is
an ideal number, the ideal number is converted to match the type of
the other operand (§Expression).
- If both operands are ideal numbers, the conversion is to ideal floats
if one of the operands is an ideal float (relevant for "/" and "%").
- The right operand in a shift operation must be always be an unsigned int
(or an ideal number that can be safely converted into an unsigned int)
(§Arithmetic operators).
Unary operators have the highest precedence. They are evaluated from
right to left.
right to left. Note that "++" and "--" are outside the unary operator
hierachy (they are statements) and they apply to the operand on the left.
Specifically, "*p++" means "(*p)++" in Go (as opposed to "*(p++)" in C).
There are six precedence levels for binary operators:
multiplication operators bind strongest, followed by addition