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- language for struct field tags

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Robert Griesemer 2008-10-30 15:52:37 -07:00
parent dc6bd11ce8
commit 2e90e5424e
1 changed files with 17 additions and 2 deletions
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19
doc/go_spec.txt
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@ -4,7 +4,7 @@ The Go Programming Language Specification (DRAFT)
Robert Griesemer, Rob Pike, Ken Thompson Robert Griesemer, Rob Pike, Ken Thompson
---- ----
(October 28, 2008) (October 30, 2008)
This document is a semi-formal specification of the Go systems This document is a semi-formal specification of the Go systems
@ -1094,7 +1094,8 @@ identifier may be declared twice and all field types must be complete
types (§Types). types (§Types).
StructType = "struct" [ "{" [ List<FieldDecl> ] "}" ] . StructType = "struct" [ "{" [ List<FieldDecl> ] "}" ] .
FieldDecl = IdentifierList CompleteType | TypeName . FieldDecl = (IdentifierList CompleteType | TypeName) [ Tag ] .
Tag = string_lit .
// An empty struct. // An empty struct.
struct {} struct {}
@ -1135,6 +1136,20 @@ 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 accessible as fields and methods of the struct without the need to provide the
type name of the respective anonymous field (§Selectors). type name of the respective anonymous field (§Selectors).
A field declaration may be followed by an optional string literal tag which
becomes an ``attribute'' for all the identifiers in the corresponding
field declaration. The tags are available via the reflection library but
are ignored otherwise. A tag may contain arbitrary application-specific
information (for instance protocol buffer field information).
// A struct corresponding to the EventIdMessage protocol buffer.
// The tag strings contain the protocol buffer field tags.
struct {
time_usec uint64 "1";
server_ip uint32 "2";
process_id uint32 "3";
}
Forward declaration: Forward declaration:
A struct type consisting of only the reserved word "struct" may be used in A struct type consisting of only the reserved word "struct" may be used in
a type declaration; it declares an incomplete struct type (§Type declarations). a type declaration; it declares an incomplete struct type (§Type declarations).