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</pre></div><pre class="rust"><code><span class="doccomment">//! Assert an expression is not equal to another expression.
//!
//! Pseudocode:<br>
//! a ≠ b
//!
//! # Module macro
//!
//! * [`assert_ne_as_result`](macro@crate::assert_ne_as_result)
//!
//! # Rust standard macros
//!
//! * [`assert_ne`](https://doc.rust-lang.org/std/macro.assert_ne.html)
//! * [`debug_assert_ne`](https://doc.rust-lang.org/std/macro.debug_assert_ne.html)
/// Assert an expression is not equal to another expression.
///
/// Pseudocode:<br>
/// a ≠ b
///
/// * If true, return Result `Ok(())`.
///
/// * When false, return [`Err`] with a message and the values of the
/// expressions with their debug representations.
///
/// This macro provides the same statements as [`assert_`](macro.assert_.html),
/// except this macro returns a Result, rather than doing a panic.
///
/// This macro is useful for runtime checks, such as checking parameters,
/// or sanitizing inputs, or handling different results in different ways.
///
/// # Module macro
///
/// * [`assert_ne_as_result`](macro@crate::assert_ne_as_result)
///
/// # Rust standard macros
///
/// * [`assert_ne`](https://doc.rust-lang.org/std/macro.assert_ne.html)
/// * [`debug_assert_ne`](https://doc.rust-lang.org/std/macro.debug_assert_ne.html)
///
</span><span class="attr">#[macro_export]
</span><span class="macro">macro_rules!</span> assert_ne_as_result {
(<span class="macro-nonterminal">$a</span>:expr, <span class="macro-nonterminal">$b</span>:expr $(,)<span class="question-mark">?</span>) => {{
<span class="kw">match </span>(<span class="kw-2">&</span><span class="macro-nonterminal">$a</span>, <span class="kw-2">&</span><span class="macro-nonterminal">$b</span>) {
(a, b) => {
<span class="kw">if </span>a != b {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(<span class="macro">format!</span>(
<span class="macro">concat!</span>(
<span class="string">"assertion failed: `assert_ne!(a, b)`\n"</span>,
<span class="string">"https://docs.rs/assertables/"</span>, <span class="macro">env!</span>(<span class="string">"CARGO_PKG_VERSION"</span>), <span class="string">"/assertables/macro.assert_ne.html\n"</span>,
<span class="string">" a label: `{}`,\n"</span>,
<span class="string">" a debug: `{:?}`,\n"</span>,
<span class="string">" b label: `{}`,\n"</span>,
<span class="string">" b debug: `{:?}`"
</span>),
<span class="macro">stringify!</span>(<span class="macro-nonterminal">$a</span>),
a,
<span class="macro">stringify!</span>(<span class="macro-nonterminal">$b</span>),
b
))
}
}
}
}};
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="attr">#[test]
</span><span class="kw">fn </span>test_assert_ne_as_result_x_success() {
<span class="kw">let </span>a: i32 = <span class="number">1</span>;
<span class="kw">let </span>b: i32 = <span class="number">2</span>;
<span class="kw">let </span>result = <span class="macro">assert_ne_as_result!</span>(a, b);
<span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>(()));
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_assert_ne_as_result_x_failure() {
<span class="kw">let </span>a: i32 = <span class="number">1</span>;
<span class="kw">let </span>b: i32 = <span class="number">1</span>;
<span class="kw">let </span>result = <span class="macro">assert_ne_as_result!</span>(a, b);
<span class="macro">assert!</span>(result.is_err());
<span class="macro">assert_eq!</span>(
result.unwrap_err(),
<span class="macro">concat!</span>(
<span class="string">"assertion failed: `assert_ne!(a, b)`\n"</span>,
<span class="string">"https://docs.rs/assertables/"</span>, <span class="macro">env!</span>(<span class="string">"CARGO_PKG_VERSION"</span>), <span class="string">"/assertables/macro.assert_ne.html\n"</span>,
<span class="string">" a label: `a`,\n"</span>,
<span class="string">" a debug: `1`,\n"</span>,
<span class="string">" b label: `b`,\n"</span>,
<span class="string">" b debug: `1`"</span>,
)
);
}
}
</code></pre></div></section></main></body></html>