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Some exciting HTML and CSS here. R=remyoudompheng, rsc, r CC=golang-dev https://golang.org/cl/5460047
224 lines
6.0 KiB
HTML
224 lines
6.0 KiB
HTML
<!-- Go 1 Release Notes -->
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<!--
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DO NOT EDIT: created by
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tmpltohtml go1.tmpl
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-->
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<h2 id="introduction">Introduction to Go 1</h2>
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<p>
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For a full explanation of the motivation and design of Go 1, see XXX.
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Here follows a summary.
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</p>
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<p>
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Go 1 is intended to be a stable language and core library set that
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will form a reliable foundation for people and organizations that
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want to make a long-term commitment to developing in the Go programming
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language. Go will continue to develop, but in a way that guarantees
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code written to the Go 1 specification will continue to work. For
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instance, Go 1 will be a supported platform on Google App Engine
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for the next few years. Incompatible changes to the environment,
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should they arise, will be done in a distinct version.
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</p>
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<p>
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This document describes the changes in the language and libraries
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in Go 1, relative to the previous release, r60 (at the time of
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writing, tagged as r60.3). It also explains how to update code at
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r60 to compile and run under Go 1. Finally, it outlines the new
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<code>go</code> command for building Go programs and the new binary
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release process being introduced. Most of these topics have more
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thorough presentations elsewhere; such documents are linked below.
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<h2 id="language">Changes to the language</h2>
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<h3 id="append">Append</h3>
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<h3 id="close">Close</h3>
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<h3 id="literals">Composite literals</h3>
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<h3 id="init">Goroutines during init</h3>
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<h3 id="rune">The rune type</h3>
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<h3 id="delete">Deleting from maps</h3>
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<p>
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The original syntax for deleting an element in a map was:
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</p>
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<pre>
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m[x] = ignored, false
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</pre>
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<p>
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In Go 1, that syntax has gone; instead there is a new built-in
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function, <code>delete</code>. The call
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</p>
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<pre><!--{{code "progs/go1.go" `/delete\(m, k\)/`}}
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--> delete(m, k)
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</pre>
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<p>
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will delete the map entry retrieved by the expression <code>m[k]</code>.
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There is no return value. Deleting a non-existent entry is a no-op.
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</p>
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<p>
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<em>Updating</em>:
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Gofix will convert expressions of the form <code>m[k] = ignored,
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false</code> into <code>delete(m, k)</code> when it is clear that
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the ignored value can be safely discarded from the program and
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<code>false</code> refers to the predefined boolean constant. Gofix
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will flag other uses of the syntax for inspection by the programmer.
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</p>
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<h3 id="map_iteration">Iterating in maps</h3>
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<h3 id="multiple_assignment">Multiple assignment</h3>
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<h3 id="shadowing">Returns and shadowed variables</h3>
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<h3 id="equality">Equality of structs and arrays</h3>
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<h2 id="library">Changes to the library</h2>
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<h3 id="hierarchy">The package hierarchy</h3>
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<p>
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Go 1 has a rearranged package hierarchy that groups related items
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into subdirectories. For instance, <code>utf8</code> and
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<code>utf16</code> now occupy subdirectories of <code>unicode</code>.
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Also, <a href="#subrepo">some packages</a> have moved into
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subrepositories of
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<a href="http://code.google.com/p/go"><code>code.google.com/p/go</code></a>
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while <a href="#deleted">others</a> have been deleted outright.
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</p>
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<table class="codetable" frame="border" summary="Moved packages">
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<colgroup align="left" width="60%"></colgroup>
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<colgroup align="left" width="40%"></colgroup>
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<tr>
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<th align="left">Old path</th>
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<th align="left">New path</th>
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</tr>
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<tr><td>asn1 <td>encoding/asn1
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<tr><td>csv</td> <td>encoding/csv</td></tr>
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<tr><td>gob</td> <td>encoding/gob</td></tr>
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<tr><td>json</td> <td>encoding/json</td></tr>
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<tr><td>xml</td> <td>encoding/xml</td></tr>
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<tr>
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<td colspan="2"><hr></td>
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</tr>
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<tr><td>exp/template/html</td> <td>html/template</td></tr>
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<tr>
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<td colspan="2"><hr></td>
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</tr>
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<tr><td>big</td> <td>math/big</td></tr>
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<tr><td>cmath</td> <td>math/cmplx</td></tr>
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<tr><td>rand</td> <td>math/rand</td></tr>
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<tr>
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<td colspan="2"><hr></td>
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</tr>
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<tr><td>http</td> <td>net/http</td></tr>
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<tr><td>http/cgi</td> <td>net/http/cgi</td></tr>
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<tr><td>http/fcgi</td> <td>net/http/fcgi</td></tr>
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<tr><td>http/httptest</td> <td>net/http/httptest</td></tr>
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<tr><td>http/pprof</td> <td>net/http/pprof</td></tr>
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<tr><td>mail</td> <td>net/mail</td></tr>
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<tr><td>rpc</td> <td>net/rpc</td></tr>
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<tr><td>rpc/jsonrpc</td> <td>net/rpc/jsonrpc</td></tr>
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<tr><td>smtp</td> <td>net/smtp</td></tr>
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<tr><td>url</td> <td>net/url</td></tr>
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<tr>
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<td colspan="2"><hr></td>
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</tr>
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<tr><td>exec</td> <td>os/exec</td></tr>
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<tr>
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<td colspan="2"><hr></td>
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</tr>
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<tr><td>scanner</td> <td>text/scanner</td></tr>
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<tr><td>tabwriter</td> <td>text/tabwriter</td></tr>
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<tr><td>template</td> <td>text/template</td></tr>
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<tr><td>template/parse</td> <td>text/template/parse</td></tr>
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<tr>
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<td colspan="2"><hr></td>
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</tr>
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<tr><td>utf8</td> <td>unicode/utf8</td></tr>
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<tr><td>utf16</td> <td>unicode/utf16</td></tr>
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</table>
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<p>
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Note that the package names for the old <code>cmath</code> and
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<code>exp/template/html</code> packages have changed to <code>cmplx</code>
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and <code>template</code>.
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</p>
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<p>
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<em>Updating</em>:
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Gofix will update all imports and package renames for packages that
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remain inside the standard repository. Programs that import packages
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that are no longer in the standard repository will need to be edited
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by hand.
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<font color="red">TODO: should warn about deletions.</font>
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<font color="red">TODO: should also handle packages that move to subrepos.</font>
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</p>
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<h3 id="errors">The error type</h3>
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<h3 id="errno">System call errors</h3>
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<h3 id="time">Time</h3>
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<h3 id="html">The html package</h3>
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<h3 id="http">The http package</h3>
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<h3 id="strconv">The strconv package</h3>
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<h3 id="exp">The package tree exp</h3>
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<h3 id="old">The package tree old</h3>
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<h3 id="deleted">Deleted packages</h3>
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<!--
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moving to exp/* (and thus not in Go 1):
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ebnf, command ebnflint
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go/types, command gotype
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http/spdy
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deleted:
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container/vector
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exp/datafmt
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go/typechecker
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try, command gotry
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go/typechecker
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go/types
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ebnf (and cmd/ebnflint)
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container/vector
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try (and gotry)
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exp/datafmt
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netchan
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-->
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<h3 id="subrepo">Packages moving to subrepositories</h3>
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<!--
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crypto/openpgp to XXX
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maybe exp/ssh?
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-->
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<h3 id="os_fileinfo">The os.FileInfo type</h3>
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<h2 id="go_command">The go command</h2>
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<h2 id="releases">Packaged releases</h2>
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