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Document futility of printing temporary pointers

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Kornel 2024-07-17 22:39:31 +01:00
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library/core/src/fmt/mod.rs
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@ -975,9 +975,17 @@ pub trait UpperHex {
/// `p` formatting.
///
/// The `Pointer` trait should format its output as a memory location. This is commonly presented
/// as hexadecimal.
/// as hexadecimal. For more information on formatters, see [the module-level documentation][module].
///
/// For more information on formatters, see [the module-level documentation][module].
/// Printing of pointers is not a reliable way to discover how Rust programs are implemented.
/// The act of reading an address changes the program itself, and may change how the data is represented
/// in memory, and may affect which optimizations are applied to the code.
///
/// The printed pointer values are not guaranteed to be stable nor unique identifiers of objects.
/// Rust allows moving values to different memory locations, and may reuse the same memory locations
/// for different purposes.
///
/// There is no guarantee that the printed value can be converted back to a pointer.
///
/// [module]: ../../std/fmt/index.html
///