rust

问题 In there any way in Rust to create a local function which can be called more than once . The way I'd do that in Python is: def method1(): def inner_method1(): print("Hello") inner_method1() inner_method1() 回答1: Yes, you can define functions inside functions: fn method1() { fn inner_method1() { println!("Hello"); } inner_method1(); inner_method1(); } However, inner functions don't have access to the outer scope. They're just normal functions that are not accessible from outside the function.

问题 In there any way in Rust to create a local function which can be called more than once . The way I'd do that in Python is: def method1(): def inner_method1(): print("Hello") inner_method1() inner_method1() 回答1: Yes, you can define functions inside functions: fn method1() { fn inner_method1() { println!("Hello"); } inner_method1(); inner_method1(); } However, inner functions don't have access to the outer scope. They're just normal functions that are not accessible from outside the function.

问题 In there any way in Rust to create a local function which can be called more than once . The way I'd do that in Python is: def method1(): def inner_method1(): print("Hello") inner_method1() inner_method1() 回答1: Yes, you can define functions inside functions: fn method1() { fn inner_method1() { println!("Hello"); } inner_method1(); inner_method1(); } However, inner functions don't have access to the outer scope. They're just normal functions that are not accessible from outside the function.

问题 In there any way in Rust to create a local function which can be called more than once . The way I'd do that in Python is: def method1(): def inner_method1(): print("Hello") inner_method1() inner_method1() 回答1: Yes, you can define functions inside functions: fn method1() { fn inner_method1() { println!("Hello"); } inner_method1(); inner_method1(); } However, inner functions don't have access to the outer scope. They're just normal functions that are not accessible from outside the function.

问题 So I'm trying to follow the diesel.rs tutorial using PostgreSQL (https://diesel.rs/guides/getting-started/). When I get to the diesel setup step I get an "authentication method 10 not supported" error. I've looked this up on Google and have not found any solutions to this. Hoping someone here knows how to resolve it. Thanks. 回答1: You have to upgrade the PostgreSQL client software (in this case, the libpq used by the Rust driver) to a later version that supports the scram-sha-256

问题 So I'm trying to follow the diesel.rs tutorial using PostgreSQL (https://diesel.rs/guides/getting-started/). When I get to the diesel setup step I get an "authentication method 10 not supported" error. I've looked this up on Google and have not found any solutions to this. Hoping someone here knows how to resolve it. Thanks. 回答1: You have to upgrade the PostgreSQL client software (in this case, the libpq used by the Rust driver) to a later version that supports the scram-sha-256

问题 So I'm trying to follow the diesel.rs tutorial using PostgreSQL (https://diesel.rs/guides/getting-started/). When I get to the diesel setup step I get an "authentication method 10 not supported" error. I've looked this up on Google and have not found any solutions to this. Hoping someone here knows how to resolve it. Thanks. 回答1: You have to upgrade the PostgreSQL client software (in this case, the libpq used by the Rust driver) to a later version that supports the scram-sha-256

问题 I have a std::collections::HashMap that contains some entries. I want to find the key that corresponds to a particular value that is already in the hash map. 回答1: Iterate over the entries of the HashMap , find the entry matching the value, and map to the key. use std::collections::HashMap; fn find_key_for_value<'a>(map: &'a HashMap<i32, &'static str>, value: &str) -> Option<&'a i32> { map.iter() .find_map(|(key, &val)| if val == value { Some(key) } else { None }) } fn main() { let mut map =

问题 Can someone explain to me how "production" Rust nightly is? I want to use the PyO3 crate which uses the specialization feature that needs nightly Rust. Does using a nightly version of Rust is production ready? I understand that things might break in future releases and API changes might be introduced but in terms of quality/testing/production readiness is nightly safe? From this thread on Rust users it seems I should be fine as long as I limit my non-stable features usage (e.g. only to

问题 Can someone explain to me how "production" Rust nightly is? I want to use the PyO3 crate which uses the specialization feature that needs nightly Rust. Does using a nightly version of Rust is production ready? I understand that things might break in future releases and API changes might be introduced but in terms of quality/testing/production readiness is nightly safe? From this thread on Rust users it seems I should be fine as long as I limit my non-stable features usage (e.g. only to