Struct Changer 

pub struct Changer<'a> { /* private fields */ }

A changer structure for change some specific values in the file in succession.

Example

collect a Changer type (same with Builder, Reader):

use self::simple_file_manager::fileapi::FileAPI;

let file = FileAPI::from("filename.gph");
let changer = file.changer();

// change the value in the 1th line and 2th row to value '123':
// you can consecutive change values:
changer.change_value(1, 2, "234")
    .change_value(2, 2, "567")
    .change_value(3, 2, "560")
    .execute(); // after modifying the value, you will need to execute your changes.

Implementations

impl Changer<'_>

pub fn change_value(self, line: usize, row: usize, value: &str) -> Self

A function to change a value in this data storage file.

Example

collect a Changer type (same with Builder, Reader):

use self::simple_file_manager::fileapi::FileAPI;

let file = FileAPI::from("filename.gph");
let changer = file.changer();

// change the value in the 1th line and 2th row to value '123':
// you can consecutive change values:
changer.change_value(1, 2, "234")
    .change_value(2, 2, "567")
    .change_value(3, 2, "560")
    .execute(); // after modifying the value, you will need to execute your changes.

pub fn execute(&self) -> &FileAPI

Confirm and implement the changes.

Example

collect a Changer type (same with Builder, Reader):

use self::simple_file_manager::fileapi::FileAPI;

let file = FileAPI::from("filename.gph");
let changer = file.changer();

// change the value in the 1th line and 2th row to value '123':
// you can consecutive change values:
changer.change_value(1, 2, "234")
    .change_value(2, 2, "567")
    .change_value(3, 2, "560")
    .execute(); // after modifying the value, you will need to execute your changes.