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import std.stdio;
import std.conv;
template PString(int L){
align(1) struct ps {
ubyte length;
char[L] data;
const int maxlength = L;
void opCall(char []s) {
assert (maxlength < 255);
if(s.length > maxlength) {
this.length = to!ubyte(maxlength);
data[0..this.length] = s[0..this.length];
} else {
this.length = to!ubyte(s.length);
data[0..s.length] = s[0..s.length];
}
}
char []opCast() {
return data[0..this.length];
}
}
}
struct TitleRecord {
short id;
char[49] text;
//PString!(49).ps text;
};
TitleRecord tr;
void main()
{
auto stream = File("filename","wb+");
tr.id = 1234;
tr.text = "hello world";
//tr.text ( cast(char[]) "hello world!" );
//ubyte[] outstring = cast(ubyte[]) "blabla";
writeln(tr);
//stream.write(tr);
//stream.rawWrite(tr);
stream.rawWrite((&tr)[0..1]); // see https://stackoverflow.com/a/63489442/2600099
//stream.rawWrite([tr]);
//stream.rawWrite(cast(ubyte[52]) tr);
//stream.rawWrite(cast(ubyte[]) tr);
//fwrite(&tr, 4, 1, stream);
//stream.rewind();
//auto inbytes = new char[4];
//stream.rawRead(inbytes);
//writeln("inbytes=",inbytes);
//assert(inbytes[3] == outstring[3]);
}
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