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-rwxr-xr-xmeap/ch6/src/main.rs89
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);
+}