Init.

1 files changed, 89 insertions, 0 deletions

diff --git a/meap/ch6/src/main.rs b/meap/ch6/src/main.rs
new file mode 100755
index 0000000..187cd7c
--- /dev/null
+++ b/meap/ch6/src/main.rs
@@ -0,0 +1,89 @@
+//use std::borrow::Cow;
+//use std::ffi::CStr;
+//use std::os::raw::c_char;
+//
+//static B: [u8; 10] = [99, 97, 114, 114, 121, 116, 111, 119, 101, 108];
+//static C: [u8; 11] = [116, 104, 97, 110, 107, 115, 102, 105, 115, 104, 0];
+//
+//fn main() {
+//    let a = 42;
+//    let b: String;
+//    let c: Cow<str>;
+//
+//    unsafe {
+//        let b_ptr = &B as *const u8 as *mut u8;
+//        b = String::from_raw_parts(b_ptr, 10, 10);
+//
+//        let c_ptr = &C as *const u8 as *const c_char;
+//        c = CStr::from_ptr(c_ptr).to_string_lossy();
+//    }
+//
+//    println!("{} {} {}", a, b, c);
+//}
+
+
+//fn main() {
+//    let a: i64 = 42;
+//    let a_ptr = &a as *const i64;
+//    let a_addr: usize = unsafe { std::mem::transmute(a_ptr) };
+//
+//    println!("{} {:p} 0x{:x}", a, a_ptr, a_addr + 7);
+//}
+
+
+//fn main() {
+//    let ptr = 42 as *const Vec<String>;
+//
+//    unsafe {
+//        let new_addr = ptr.offset(4);
+//        println!("{:p} => {:p}", ptr, new_addr);
+//    }
+//}
+
+
+//fn main() {
+//    let password = String::from("lousy");
+//    dbg!(is_strong(password));
+//    dbg!(is_strong("breakage"));
+//}
+//
+//fn is_strong<T: AsRef<str>>(password: T) -> bool {
+//    password.as_ref().len() > 5
+//}
+
+
+//use std::mem::drop;
+//
+//fn main() {
+////    let a: i32 = 40;
+////    let b: Box<i32> = Box::new(60);
+////    dbg!(a + *b);
+//
+//    let a = Box::new(1);
+//    let b = Box::new(1);
+//    let c = Box::new(1);
+//
+//    let result1 = *a + *b + *c;
+//
+//    drop(a);
+//    let d = Box::new(1);
+//    let result2 = *b + *c + *d;
+//
+//    println!("{} {}", result1, result2);
+//}
+
+
+fn main() {
+    let mut n_nonzero = 0;
+
+    for i in 0..10_000 {
+        let ptr = i as *const u8;
+        let byte_at_addr = unsafe { *ptr };
+
+        if byte_at_addr != 0 {
+            n_nonzero += 1;
+        }
+    }
+
+    println!("{}", n_nonzero);
+}