mem_dbg 0.4.3

Traits and associated procedural macros to display recursively the layout and memory usage of a value
Documentation 
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#![cfg(feature = "std")]
#![cfg(feature = "derive")]

use mem_dbg::*;
use std::path::PathBuf;

#[test]
fn test_pathbuf_in_struct() {
    #[derive(MemSize)]
    struct Test {
        path_buf: PathBuf,
    }

    let s = Test {
        path_buf: PathBuf::from("/tmp/test"),
    };
    let size = s.mem_size(SizeFlags::default());

    // PathBuf stack size (ptr + len + capacity = 3 * pointer size) + heap ("/tmp/test")
    assert_eq!(size, std::mem::size_of::<PathBuf>() + "/tmp/test".len());
}