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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>std</a>::<wbr><a class="macro" href=''>column</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'>
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<pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">column</span> {
() <span class="op">=></span> { ... };
}</pre>
<div class='docblock'><p>A macro which expands to the column number on which it was invoked.</p>
<p>The expanded expression has type <code>u32</code>, and the returned column is not
the invocation of the <code>column!()</code> macro itself, but rather the first macro
invocation leading up to the invocation of the <code>column!()</code> macro.</p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">current_col</span> <span class="op">=</span> <span class="macro">column</span><span class="macro">!</span>();
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"defined on column: {}"</span>, <span class="ident">current_col</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=fn%20main()%20%7B%0Alet%20current_col%20%3D%20column!()%3B%0Aprintln!(%22defined%20on%20column%3A%20%7B%7D%22%2C%20current_col)%3B%0A%7D">Run</a></pre>
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