From 22675cd8dc75d8b8d4b0f818f5b093efbc364802 Mon Sep 17 00:00:00 2001 From: Jasper Ras Date: Fri, 8 Aug 2025 22:44:15 +0200 Subject: vault backup: 2025-08-08 22:44:15 --- Variables lives on the stack.md | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) create mode 100644 Variables lives on the stack.md (limited to 'Variables lives on the stack.md') diff --git a/Variables lives on the stack.md b/Variables lives on the stack.md new file mode 100644 index 0000000..579a984 --- /dev/null +++ b/Variables lives on the stack.md @@ -0,0 +1,16 @@ +[[Rust]] +[[To put data on the heap use a Box]] + + +--- +Each function has a frame consisting of variables. Those frames live on the stack. + +A frame is **deallocated when the function returns**. + +If we assign a variable such as +```rust +let a = [0; 1_000_000]; +let b = a; +``` + +the value of a is **copied** to b (thus we get two huge arrays). This is **expensive**. Think about what happens when we call a function. \ No newline at end of file -- cgit v1.2.3