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The Go programming language
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The lowering of ast.RangeStmt now has three distinct cases: 1) rangeIter for maps and strings; approximately: it = range x for { k, v, ok = next it if !ok { break } ... } The Range instruction and the interpreter's "iter" datatype are now restricted to these types. 2) rangeChan for channels; approximately: for { k, ok = <-x if !ok { break } ... } 3) rangeIndexed for slices, arrays, and *array; approximately: for k, l = 0, len(x); k < l; k++ { v = x[k] ... } In all cases we now evaluate the side effects of the range expression exactly once, per comments on http://code.google.com/p/go/issues/detail?id=4644. However the exact spec wording is still being discussed in https://golang.org/cl/7307083/. Further (small) changes may be required once the dust settles. R=iant CC=golang-dev https://golang.org/cl/7303074 |
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This is the source code repository for the Go programming language. For documentation about how to install and use Go, visit http://golang.org/ or load doc/install.html in your web browser. After installing Go, you can view a nicely formatted doc/install.html by running godoc --http=:6060 and then visiting http://localhost:6060/doc/install.html. Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file. -- Binary Distribution Notes If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this README). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install.html). You should also add the Go binary directory $GOROOT/bin to your shell's path. For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile: export GOROOT=$HOME/go export PATH=$PATH:$GOROOT/bin See doc/install.html for more details.