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[英]How do I print variables in Rust and have it show everything about that variable, like Ruby's .inspect?
[英]How do I print both an expression and its value in Rust?
有没有办法做到这一点?
self.mega_ultra_field = 100500;
print_expr_and_value!(self.mega_ultra_field);
输出:
self.mega_ultra_field 100500
使用dbg!
:
dbg!(self.mega_ultra_field);
[src/main.rs:16] self.mega_ultra_field = 100500
使用stringify!
:
macro_rules! print_expr_and_value {
($e:expr) => {
eprintln!("{} {}", stringify!($e), $e)
};
}
struct Foo {
mega_ultra_field: i32,
}
impl Foo {
fn bar(&mut self) {
self.mega_ultra_field = 100500;
print_expr_and_value!(self.mega_ultra_field);
dbg!(self.mega_ultra_field);
}
}
fn main() {
Foo {
mega_ultra_field: 0,
}
.bar();
}
self.mega_ultra_field 100500
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