D Documentation  
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  1. Introduction
    1. A simple tutorial
    2. Switching to D
    3. An advanced tutorial
  2. Language Reference
    1. General syntax
    2. Statements
    3. Types
    4. Error Handling
    5. Memory Management
  3. Std. runtime library (Phobos)
    1. std.base64
    2. std.boxer
    3. std.compiler
    4. std.conv
    5. std.ctype
    6. std.date
    7. std.file
    8. std.format
    9. std.gc
    10. std.intrinsic
    11. std.math
    12. std.md5
    13. std.mmfile
    14. std.outbuffer
    15. std.path
    16. std.process
    17. std.random
    18. std.recls
    19. std.regexp
    20. std.socket
    21. std.socketstream
    22. std.stdint
    23. std.stdio
    24. std.stream
      1. InputStream
        1. readExact
        2. read
        3. readLine
        4. opApply
        5. readString
        6. getc
        7. ungetc
        8. scanf
        9. available
        10. eof
        11. isOpen
      2. OutputStream
      3. Stream
    25. std.string
    26. std.system
    27. std.thread
    28. std.uri
    29. std.utf
    30. std.zip
    31. std.zlib
  4. Libraries and Tools
    1. mango
    2. Build
  5. Related Links
  6. About this documentation
opApply 
int opApply(int delegate(inout char[] line) dg);
int opApply(int delegate(inout ulong n, inout char[] line) dg);
int opApply(int delegate(inout wchar[] line) dg);
int opApply(int delegate(inout ulong n, inout wchar[] line) dg);


This operator (for the foreach statement) iterates through the stream line-by-line.
Breaking the foreach loop will leave the Stream at the position after line last read.
The string storing the line may be reused in each iteration of the loop.

For example:
Stream file = new BufferedFile("sample.txt");
foreach(ulong n, char[] line; file) {
  stdout.writefln("line %d: %s",n,line);
}
file.close();
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