C++ strcpy stroll vs Rust borrow-checked string copy Olympic routine

Description

Two-panel stick-figure comic comparing C++ and Rust string copying. Top panel: a blue hexagon C++ logo, the words "mental gymnastics," and a calm sidewalk scene labeled "strcpy()" where two figures simply walk past a small car that’s quietly on fire - implying the danger is hidden. Bottom panel: the Rust gear logo with "mental gymnastics," but now the sidewalk is a full gymnastics arena: stick figures vault over bars, flip upside-down, dive through tables, and karate-kick a flaming car. Scattered above them are Rust-style code snippets such as "fn alloc_str(mem: &mut Vec<char>, s: &str) -> Ptr { ... }" and "fn streq(mem: &mut Vec<char>, mut s1: Ptr, mut s2: Ptr) -> bool { ... }", illustrating the elaborate memory-safe boilerplate required. The meme humorously contrasts C++’s simple yet unsafe strcpy with Rust’s safer but mentally taxing pointer and lifetime management, highlighting low-level memory concerns, manual allocation, and the borrow checker’s complexity

Common Tags

Rust Cpp ManualMemoryManagement MemorySafety LanguageComparison LowLevelProgramming UndefinedBehavior

Comments

Anonymous ★ Top Pick C++ strcpy: “Just copy the bytes and hope.” Rust strcpy: “After convincing the borrow checker, documenting three lifetimes, and passing the safety audit, we discovered the optimizer erased the whole copy - turns out paranoia is the fastest path to zero work.”

Anonymous ★ Top Pick

C++ strcpy: “Just copy the bytes and hope.” Rust strcpy: “After convincing the borrow checker, documenting three lifetimes, and passing the safety audit, we discovered the optimizer erased the whole copy - turns out paranoia is the fastest path to zero work.”
Anonymous

After 20 years of C++, I've mastered the art of strcpy() - it only takes three safety meetings, two code reviews, and one sacrificial junior developer to ensure we don't accidentally summon undefined behavior demons
Anonymous

The real mental gymnastics is explaining to your team why rewriting that 20-year-old C++ codebase in Rust will only take 'a few sprints' - when you're still wrestling with the borrow checker on day 47, trying to convince it that yes, you do actually need two mutable references to different parts of the same buffer, and no, you can't just slap 'unsafe' around everything because that defeats the entire point of the rewrite that you sold to management as 'eliminating memory safety bugs forever.'
Anonymous

C++ strcpy: stroll across the beam. Rust equivalent: full apparatus routine to appease the borrow checker, lest it no-compile you mid-flip
Anonymous

strcpy() is two keystrokes and a Sev‑1; Rust’s version is arguing with the borrow checker through five lifetimes and three trait bounds - the acrobatics hurt, but at least the car catches fire at compile time, not in prod
Anonymous

C++: strcpy is O(1) cognitive load and O(infinite) blast radius; Rust: O(n) keystrokes to appease the borrow checker, zero 3am SIGSEGVs
@RiedleroD 3y

that feeling when strcpy (string copy) is not recommended for copying strings
@Vlasoov 3y

still can be incorrectly initialized tho 😃
1. @Mikle_Bond 3y
  
  int main() {return true;}
  
  @Vlasoov 3y
  
  This is correct btw
@Armiixteryx 3y

Let me introduce you lifetimes
Zeno Bin Kanaan 3y

What was that one with the java factory of a factory?
Zeno Bin Kanaan 3y

LMAO I FOUND IT: https://ws.apache.org/xmlrpc/apidocs/org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html
@neizvestnyi 3y

Wait, it's pure C
1. Deleted Account 3y
  
  it always has been