How does one read file line by line / upto a specific delimeter of an MmFile?

[Patrick Schluter]

On Monday, 16 March 2020 at 13:09:08 UTC, Adnan wrote:
> On Sunday, 15 March 2020 at 00:37:35 UTC, H. S. Teoh wrote:
>> On Sat, Mar 14, 2020 at 10:37:37PM +0000, Adnan via 
>> Digitalmars-d-learn wrote:
>>> [...]
>>
>> That's because a memory-mapped file appears directly in your 
>> program's memory address space as if it was an array of bytes 
>> (ubyte[]).  No interpretation is imposed upon the contents.  
>> If you want lines out of it, try casting the memory to 
>> const(char)[] and using std.algorithm.splitter to get a range 
>> of lines. For example:
>>
>> 	auto mmfile = new MmFile("myfile.txt");
>> 	auto data = cast(const(char)[]) mmfile[];
>> 	auto lines = data.splitter("\n");
>> 	foreach (line; lines) {
>> 		...
>> 	}
>>
>>
>> T
>
> Would it be wasteful to cast the entire content into a const 
> string? Can a memory mapped file be read with a buffer?

a string is the same thing as immutable(char)[] . It would make 
no difference with the example above.