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@system unittest
{
import std.mmfile;
import std.file;
std.file.write(deleteme, "hello"); // deleteme is a temporary filename
scope(exit) remove(deleteme);
// Use a scope class so the file will be closed at the end of this function
scope mmfile = new MmFile(deleteme);
assert(mmfile.length == "hello".length);
// Access file contents with the slice operator
// This is typed as `void[]`, so cast to `char[]` or `ubyte[]` to use it
const data = cast(const(char)[]) mmfile[];
// At this point, the file content may not have been read yet.
// In that case, the following memory access will intentionally
// trigger a page fault, causing the kernel to load the file contents
assert(data[0 .. 5] == "hello");
}
@system unittest
{
import std.mmfile;
import std.file;
scope(exit) remove(deleteme);
scope mmfile = new MmFile(deleteme, MmFile.Mode.readWriteNew, 5, null);
assert(mmfile.length == 5);
auto data = cast(ubyte[]) mmfile[];
// This write to memory will be reflected in the file contents
data[] = '\n';
mmfile.flush();
assert(std.file.read(deleteme) == "\n\n\n\n\n");
}
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