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package mmap_test
import (
"fmt"
"log"
"os"
"github.com/edsrzf/mmap-go"
)
func ExampleMapRegion() {
m, err := mmap.MapRegion(nil, 100, mmap.RDWR, mmap.ANON, 0)
if err != nil {
log.Fatal(err)
}
// m acts as a writable slice of bytes that is not managed by the Go runtime.
fmt.Println(len(m))
// Because the region is not managed by the Go runtime, the Unmap method should
// be called when finished with it to avoid leaking memory.
if err := m.Unmap(); err != nil {
log.Fatal(err)
}
// Output: 100
}
func ExampleMap() {
f, err := os.OpenFile("notes.txt", os.O_RDWR|os.O_CREATE, 0755)
if err != nil {
log.Fatal(err)
}
_, err = f.WriteString("Hello, world")
if err != nil {
log.Fatal(err)
}
// The file must be closed, even after calling Unmap.
defer f.Close()
m, err := mmap.Map(f, mmap.RDWR, 0)
if err != nil {
log.Fatal(err)
}
// m acts as a writable slice of bytes that is a view into the open file, notes.txt.
// It is sized to the file contents automatically.
fmt.Println(string(m))
// The Unmap method should be called when finished with it to avoid leaking memory
// and to ensure that writes are flushed to disk.
if err := m.Unmap(); err != nil {
log.Fatal(err)
}
// Hello, world
}
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