parity-util-mem 0.12.0

Collection of memory related utilities
Documentation 
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// Copyright 2020 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Estimation for heapsize calculation. Usable to replace call to allocator method (for some
//! allocators or simply because we just need a deterministic cunsumption measurement).

use crate::malloc_size::{MallocShallowSizeOf, MallocSizeOf, MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
#[cfg(not(feature = "std"))]
use alloc::boxed::Box;
#[cfg(not(feature = "std"))]
use alloc::string::String;
#[cfg(not(feature = "std"))]
use alloc::sync::Arc;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
#[cfg(not(feature = "std"))]
use core::mem::{size_of, size_of_val};

#[cfg(feature = "std")]
use std::mem::{size_of, size_of_val};
#[cfg(feature = "std")]
use std::sync::Arc;

impl<T: ?Sized> MallocShallowSizeOf for Box<T> {
	fn shallow_size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		size_of_val(&**self)
	}
}

impl MallocSizeOf for String {
	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		self.capacity() * size_of::<u8>()
	}
}

impl<T> MallocShallowSizeOf for Vec<T> {
	fn shallow_size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		self.capacity() * size_of::<T>()
	}
}

impl<T> MallocUnconditionalShallowSizeOf for Arc<T> {
	fn unconditional_shallow_size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
		size_of::<T>()
	}
}