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go spec: clarification of type declarations

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https://golang.org/cl/849044
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Robert Griesemer 2010-03-31 16:37:22 -07:00
parent fd3e067e0f
commit 735e00d4a0
1 changed files with 8 additions and 2 deletions
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doc/go_spec.html
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@ -1704,9 +1704,11 @@ last non-empty expression list.
<p> <p>
A type declaration binds an identifier, the <i>type name</i>, to a new type A type declaration binds an identifier, the <i>type name</i>, to a new type
that has the same definition (element, fields, channel direction, etc.) as that has the same definition (element, fields, channel direction, etc.) as
an existing type. The new type is an existing type. With the exception of interface types, the new type is
<a href="#Properties_of_types_and_values">compatible</a> with, but <a href="#Properties_of_types_and_values">compatible</a> with, but
<a href="#Properties_of_types_and_values">different</a> from, the existing type. <a href="#Properties_of_types_and_values">different</a> from, the existing type.
A newly defined interface type is always
<a href="#Properties_of_types_and_values">identical</a> to the existing type.
</p> </p>
<pre class="ebnf"> <pre class="ebnf">
@ -1737,7 +1739,7 @@ type Cipher interface {
<p> <p>
The declared type does not inherit any <a href="#Method_declarations">methods</a> The declared type does not inherit any <a href="#Method_declarations">methods</a>
bound to the existing type, but the <a href="#Types">method set</a> bound to the existing type, but the <a href="#Types">method set</a>
of elements of a composite type is not changed: of elements of a composite type or of an interface type is not changed:
</p> </p>
<pre> <pre>
@ -1754,6 +1756,10 @@ type NewMutex Mutex
type PrintableMutex struct { type PrintableMutex struct {
Mutex Mutex
} }
// MyCipher is an interface type that has the same method set as Cipher;
// it is indistinguishable from Cipher.
type MyCipher Cipher
</pre> </pre>
<p> <p>