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我正在尝试通过翻译 Stepanov 和 McJones 所著的“编程基础”一书中的 C++ 代码来学习 Rust。这是一个简单的代码片段:
extern crate num_bigint;
use num_bigint::BigInt;
pub fn fibonacci_matrix_multiply(x: (&BigInt, &BigInt), y: (&BigInt, &BigInt)) -> (BigInt, BigInt) {
(x.0 * (y.1 + y.0) + x.1 * y.0, x.0 * y.0 + x.1 * y.1)
}
pub fn power_accumulate_positive(
mut r: (&BigInt, &BigInt),
mut a: (&BigInt, &BigInt),
mut n: i32,
) -> (BigInt, BigInt) {
loop {
if n & 1 == 1 {
r = fibonacci_matrix_multiply(r, a);
if n == 1 {
return r;
}
}
a = fibonacci_matrix_multiply(a, a);
n = n / 2;
}
}
fn main() {}
错误信息如下:
error[E0308]: mismatched types
--> src/main.rs:16:17
|
16 | r = fibonacci_matrix_multiply(r, a);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected reference, found struct `num_bigint::BigInt`
|
= note: expected type `(&num_bigint::BigInt, &num_bigint::BigInt)`
found type `(num_bigint::BigInt, num_bigint::BigInt)`
error[E0308]: mismatched types
--> src/main.rs:18:24
|
18 | return r;
| ^ expected struct `num_bigint::BigInt`, found reference
|
= note: expected type `(num_bigint::BigInt, num_bigint::BigInt)`
found type `(&num_bigint::BigInt, &num_bigint::BigInt)`
error[E0308]: mismatched types
--> src/main.rs:21:13
|
21 | a = fibonacci_matrix_multiply(a, a);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected reference, found struct `num_bigint::BigInt`
|
= note: expected type `(&num_bigint::BigInt, &num_bigint::BigInt)`
found type `(num_bigint::BigInt, num_bigint::BigInt)`
我知道我正在返回一个结构元组并试图将它分配给一个引用元组，但我不知道如何解决这个问题。