Crate assert_impl[][src]

Macro for static assert that types implement a trait or not.

Note: this macro can only be used inside function body due to restriction of Rust.


Assuming you have the following definitions:

struct C;
struct Java;
struct JavaScript;
struct Python;
struct Rust;

trait StaticTyping {}
impl StaticTyping for C {}
impl StaticTyping for Java {}
impl StaticTyping for Rust {}

This should build:

assert_impl!(StaticTyping: C, Java, Rust);
assert_impl!(StaticTyping: C, Java, Rust, );
assert_impl!(!StaticTyping: JavaScript, Python);
assert_impl!(!StaticTyping: JavaScript, Python, );

But these should fail to build:

This example deliberately fails to compile
assert_impl!(StaticTyping: JavaScript);
This example deliberately fails to compile
assert_impl!(!StaticTyping: Rust);