Macro drone_core::dbg [−][src]
Prints and returns the value of a given expression for quick and dirty debugging.
The macro works by using the Debug
implementation of the type of the given
expression to print the value to the log port #1 along with the source
location of the macro invocation as well as the source code of the
expression.
Invoking the macro on an expression moves and takes ownership of it before
returning the evaluated expression unchanged. If the type of the expression
does not implement Copy
and you don’t want to give up ownership, you can
instead borrow with dbg!(&expr)
for some expression expr
.
Examples
let a = 2; let b = dbg!(a * 2) + 1; // ^-- prints: [src/main.rs:2] a * 2 = 4 assert_eq!(b, 5);