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<!DOCTYPE html>
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<h1 class="main">Static Variables</h1>
<p>V also supports <em>static variables</em>, which are like <em>global variables</em>, but
available only <em>inside</em> a single unsafe function (you can look at them as
namespaced globals).</p>
<p>Note: their use is discouraged too, for reasons similar to why globals
are discouraged. The feature is supported to enable translating existing
low level C code into V code, using <code>v translate</code>.</p>
<p>Note: the function in which you use a static variable, has to be marked
with @[unsafe]. Also unlike using globals, using static variables, do not
require you to pass the flag <code>-enable-globals</code>, because they can only be
read/changed inside a single function, which has full control over the
state stored in them.</p>
<p>Here is a small example of how static variables can be used:</p>
<div class="language-v">@[unsafe]
fn counter() int {
mut static x := 42
// Note: x is initialised to 42, just _once_.
x++
return x
}
fn f() int {
return unsafe { counter() }
}
println(f()) // prints 43
println(f()) // prints 44
println(f()) // prints 45
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