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<!DOCTYPE html>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>test.zig</title>
<meta name="generator" content="KF5::SyntaxHighlighting - Definition (Zig) - Theme (Breeze Dark)"/>
</head><body style="background-color:#232629;color:#cfcfc2"><pre>
<span style="color:#2980b9">const</span> std <span style="color:#3f8058">=</span> <span style="color:#7f8c8d">@import</span>(<span style="color:#f44f4f">"std"</span>);
<span style="color:#7a7c7d">/// This is a doc comment</span>
<span style="color:#7a7c7d">// This is a comment</span>
<span style="font-weight:bold">fn</span> getData() <span style="color:#3f8058">!</span><span style="color:#2980b9">u32</span> {
<span style="color:#fdbc4b;font-weight:bold">return</span> <span style="color:#f67400">666</span>;
}
<span style="color:#7a7c7d">// multiline string</span>
<span style="color:#2980b9">const</span> hello_world_in_c <span style="color:#3f8058">=</span>
<span style="color:#f44f4f">\\#include <stdio.h></span>
<span style="color:#f44f4f">\\</span>
<span style="color:#f44f4f">\\int main(int argc, char **argv) {</span>
<span style="color:#f44f4f">\\ printf("hello world\n");</span>
<span style="color:#f44f4f">\\ return 0;</span>
<span style="color:#f44f4f">\\}</span>
;
<span style="color:#7a7c7d">// Top-level declarations are order-independent:</span>
<span style="color:#2980b9">const</span> print <span style="color:#3f8058">=</span> <span style="color:#7f8c8d">@import</span>(<span style="color:#f44f4f">"std"</span>)<span style="color:#3f8058">.</span>debug<span style="color:#3f8058">.</span>print;
<span style="font-weight:bold">pub</span> <span style="font-weight:bold">fn</span> main() <span style="color:#3f8058">!</span><span style="color:#2980b9">void</span> {
<span style="font-weight:bold">inline</span> <span style="color:#fdbc4b;font-weight:bold">for</span> (values) <span style="color:#3f8058">|</span>v<span style="color:#3f8058">,</span> i<span style="color:#3f8058">|</span> {
<span style="color:#fdbc4b;font-weight:bold">if</span> (i <span style="color:#3f8058">!=</span> <span style="color:#f67400">2</span>) <span style="color:#fdbc4b;font-weight:bold">continue</span>;
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(v);
}
<span style="color:#7a7c7d">// error union</span>
<span style="color:#2980b9">var</span> number_or_error<span style="color:#3f8058">:</span> <span style="color:#2980b9">anyerror</span><span style="color:#3f8058">!</span><span style="color:#2980b9">i32</span> <span style="color:#3f8058">=</span> <span style="font-weight:bold">error</span><span style="color:#3f8058">.</span>ArgNotFound;
print(<span style="color:#f44f4f">"</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">error union 2</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">type: {}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">value: {!}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{
<span style="color:#7f8c8d">@TypeOf</span>(number_or_error)<span style="color:#3f8058">,</span> number_or_error<span style="color:#3f8058">,</span>
});
<span style="color:#2980b9">const</span> stdout <span style="color:#3f8058">=</span> std<span style="color:#3f8058">.</span>io<span style="color:#3f8058">.</span>getStdOut()<span style="color:#3f8058">.</span>writer();
<span style="color:#fdbc4b;font-weight:bold">try</span> stdout<span style="color:#3f8058">.</span>print(<span style="color:#f44f4f">"Hello, {s}!</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#f44f4f">"world"</span>});
<span style="color:#2980b9">const</span> bytes <span style="color:#3f8058">=</span> <span style="color:#f44f4f">"hello"</span>;
print(<span style="color:#f44f4f">"{}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#7f8c8d">@TypeOf</span>(bytes)}); <span style="color:#7a7c7d">// *const [5:0]u8</span>
print(<span style="color:#f44f4f">"{d}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{bytes[<span style="color:#f67400">5</span>]}); <span style="color:#7a7c7d">// 0</span>
print(<span style="color:#f44f4f">"{}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#3daee9">'e'</span> <span style="color:#3f8058">==</span> <span style="color:#3daee9">'</span><span style="color:#3daee9">\x65</span><span style="color:#3daee9">'</span>}); <span style="color:#7a7c7d">// true</span>
print(<span style="color:#f44f4f">"{d}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#3daee9">'</span><span style="color:#3daee9">\u{1f4a9}</span><span style="color:#3daee9">'</span>}); <span style="color:#7a7c7d">// 128169</span>
print(<span style="color:#f44f4f">"{d}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#3daee9">'💯'</span>}); <span style="color:#7a7c7d">// 128175</span>
print(<span style="color:#f44f4f">"{}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{mem<span style="color:#3f8058">.</span>eql(<span style="color:#2980b9">u8</span><span style="color:#3f8058">,</span> <span style="color:#f44f4f">"hello"</span><span style="color:#3f8058">,</span> <span style="color:#f44f4f">"h</span><span style="color:#3daee9">\x65</span><span style="color:#f44f4f">llo"</span>)}); <span style="color:#7a7c7d">// true</span>
print(<span style="color:#f44f4f">"0x{x}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#f44f4f">"</span><span style="color:#3daee9">\xff</span><span style="color:#f44f4f">"</span>[<span style="color:#f67400">0</span>]}); <span style="color:#7a7c7d">// non-UTF-8 strings are possible with \xNN notation.</span>
print(<span style="color:#f44f4f">"{u}</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{<span style="color:#3daee9">'âš¡'</span>});
_ <span style="color:#3f8058">=</span> <span style="color:#7f8c8d">@import</span>(<span style="color:#f44f4f">"introducing_zig_test.zig"</span>);
}
<span style="color:#7a7c7d">// Declare an enum.</span>
<span style="color:#2980b9">const</span> Type <span style="color:#3f8058">=</span> <span style="font-weight:bold">enum</span> {
ok<span style="color:#3f8058">,</span>
not_ok<span style="color:#3f8058">,</span>
};
<span style="font-weight:bold">test</span> <span style="color:#f44f4f">"async skip test"</span> {
<span style="color:#2980b9">var</span> frame <span style="color:#3f8058">=</span> <span style="color:#2980b9">async</span> func();
<span style="color:#2980b9">const</span> result <span style="color:#3f8058">=</span> <span style="color:#2980b9">await</span> frame;
<span style="color:#fdbc4b;font-weight:bold">try</span> std<span style="color:#3f8058">.</span>testing<span style="color:#3f8058">.</span>expect(result <span style="color:#3f8058">==</span> <span style="color:#f67400">1</span>);
}
<span style="font-weight:bold">fn</span> func() <span style="color:#2980b9">i32</span> {
<span style="font-weight:bold">suspend</span> {
<span style="font-weight:bold">resume</span> @frame();
}
<span style="color:#fdbc4b;font-weight:bold">return</span> <span style="color:#f67400">1</span>;
}
<span style="font-weight:bold">pub</span> <span style="color:#2980b9">extern</span> <span style="color:#f44f4f">"c"</span> <span style="font-weight:bold">fn</span> @<span style="color:#f44f4f">"error"</span>() <span style="color:#2980b9">void</span>;
<span style="font-weight:bold">pub</span> <span style="color:#2980b9">extern</span> <span style="color:#f44f4f">"c"</span> <span style="font-weight:bold">fn</span> @<span style="color:#f44f4f">"fstat$INODE64"</span>(fd<span style="color:#3f8058">:</span> c<span style="color:#3f8058">.</span>fd_t<span style="color:#3f8058">,</span> buf<span style="color:#3f8058">:</span> <span style="color:#3f8058">*</span>c<span style="color:#3f8058">.</span>Stat) <span style="color:#2980b9">c_int</span>;
<span style="color:#2980b9">const</span> Color <span style="color:#3f8058">=</span> <span style="font-weight:bold">enum</span> {
red<span style="color:#3f8058">,</span>
@<span style="color:#f44f4f">"really red"</span><span style="color:#3f8058">,</span>
};
<span style="color:#2980b9">const</span> color<span style="color:#3f8058">:</span> Color <span style="color:#3f8058">=</span> <span style="color:#3f8058">.</span>@<span style="color:#f44f4f">"really red"</span>;
<span style="color:#2980b9">var</span> y<span style="color:#3f8058">:</span> <span style="color:#2980b9">i32</span> <span style="color:#3f8058">=</span> add(<span style="color:#f67400">10</span><span style="color:#3f8058">,</span> x);
<span style="color:#2980b9">const</span> x<span style="color:#3f8058">:</span> <span style="color:#2980b9">i32</span> <span style="color:#3f8058">=</span> add(<span style="color:#f67400">12</span><span style="color:#3f8058">,</span> <span style="color:#f67400">34</span>);
<span style="font-weight:bold">test</span> <span style="color:#f44f4f">"comptime vars"</span> {
<span style="color:#2980b9">var</span> x<span style="color:#3f8058">:</span> <span style="color:#2980b9">i32</span> <span style="color:#3f8058">=</span> <span style="color:#f67400">1</span>;
<span style="color:#2980b9">comptime</span> <span style="color:#2980b9">var</span> y<span style="color:#3f8058">:</span> <span style="color:#2980b9">i32</span> <span style="color:#3f8058">=</span> <span style="color:#f67400">1</span>;
x <span style="color:#3f8058">+=</span> <span style="color:#f67400">1</span>;
y <span style="color:#3f8058">+=</span> <span style="color:#f67400">1</span>;
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(x <span style="color:#3f8058">==</span> <span style="color:#f67400">2</span>);
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(y <span style="color:#3f8058">==</span> <span style="color:#f67400">2</span>);
<span style="color:#fdbc4b;font-weight:bold">if</span> (y <span style="color:#3f8058">!=</span> <span style="color:#f67400">2</span>) {
<span style="color:#7a7c7d">// This compile error never triggers because y is a comptime variable,</span>
<span style="color:#7a7c7d">// and so `y != 2` is a comptime value, and this if is statically evaluated.</span>
<span style="color:#7f8c8d">@compileError</span>(<span style="color:#f44f4f">"wrong y value"</span>);
}
}
<span style="color:#2980b9">const</span> decimal_int <span style="color:#3f8058">=</span> <span style="color:#f67400">98222</span>;
<span style="color:#2980b9">const</span> hex_int <span style="color:#3f8058">=</span> <span style="color:#f67400">0xff</span>;
<span style="color:#2980b9">const</span> another_hex_int <span style="color:#3f8058">=</span> <span style="color:#f67400">0xFF</span>;
<span style="color:#2980b9">const</span> octal_int <span style="color:#3f8058">=</span> <span style="color:#f67400">0o755</span>;
<span style="color:#2980b9">const</span> binary_int <span style="color:#3f8058">=</span> <span style="color:#f67400">0b11110000</span>;
<span style="color:#7a7c7d">// underscores may be placed between two digits as a visual separator</span>
<span style="color:#2980b9">const</span> one_billion <span style="color:#3f8058">=</span> <span style="color:#f67400">1_000_000_000</span>;
<span style="color:#2980b9">const</span> binary_mask <span style="color:#3f8058">=</span> <span style="color:#f67400">0b1_1111_1111</span>;
<span style="color:#2980b9">const</span> permissions <span style="color:#3f8058">=</span> <span style="color:#f67400">0o7_5_5</span>;
<span style="color:#2980b9">const</span> big_address <span style="color:#3f8058">=</span> <span style="color:#f67400">0xFF80_0000_0000_0000</span>;
<span style="color:#2980b9">const</span> floating_point <span style="color:#3f8058">=</span> <span style="color:#f67400">123.0E+77</span>;
<span style="color:#2980b9">const</span> another_float <span style="color:#3f8058">=</span> <span style="color:#f67400">123.0</span>;
<span style="color:#2980b9">const</span> yet_another <span style="color:#3f8058">=</span> <span style="color:#f67400">123.0e+77</span>;
<span style="color:#2980b9">const</span> hex_floating_point <span style="color:#3f8058">=</span> <span style="color:#f67400">0x103.70p-5</span>;
<span style="color:#2980b9">const</span> another_hex_float <span style="color:#3f8058">=</span> <span style="color:#f67400">0x103.70</span>;
<span style="color:#2980b9">const</span> yet_another_hex_float <span style="color:#3f8058">=</span> <span style="color:#f67400">0x103.70P-5</span>;
<span style="color:#7a7c7d">// underscores may be placed between two digits as a visual separator</span>
<span style="color:#2980b9">const</span> lightspeed <span style="color:#3f8058">=</span> <span style="color:#f67400">299_792_458.000_000</span>;
<span style="color:#2980b9">const</span> nanosecond <span style="color:#3f8058">=</span> <span style="color:#f67400">0.000_000_001</span>;
<span style="color:#2980b9">const</span> more_hex <span style="color:#3f8058">=</span> <span style="color:#f67400">0x1234_5678.9ABC_CDEFp-10</span>;
<span style="color:#2980b9">const</span> A <span style="color:#3f8058">=</span> <span style="font-weight:bold">error</span>{One};
<span style="color:#2980b9">const</span> B <span style="color:#3f8058">=</span> <span style="font-weight:bold">error</span>{Two};
(A <span style="color:#3f8058">||</span> B) <span style="color:#3f8058">==</span> <span style="font-weight:bold">error</span>{One<span style="color:#3f8058">,</span> Two}
<span style="color:#2980b9">const</span> x<span style="color:#3f8058">:</span> <span style="color:#2980b9">u32</span> <span style="color:#3f8058">=</span> <span style="color:#f67400">1234</span>;
<span style="color:#2980b9">const</span> ptr <span style="color:#3f8058">=</span> <span style="color:#3f8058">&</span>x;
ptr<span style="color:#3f8058">.*</span> <span style="color:#3f8058">==</span> <span style="color:#f67400">1234</span>
<span style="color:#7a7c7d">// get the size of an array</span>
<span style="color:#2980b9">comptime</span> {
assert(message<span style="color:#3f8058">.</span>len <span style="color:#3f8058">==</span> <span style="color:#f67400">5</span>);
}
<span style="font-weight:bold">test</span> <span style="color:#f44f4f">"iterate over an array"</span> {
<span style="color:#2980b9">var</span> sum<span style="color:#3f8058">:</span> <span style="color:#2980b9">usize</span> <span style="color:#3f8058">=</span> <span style="color:#f67400">0</span>;
<span style="color:#fdbc4b;font-weight:bold">for</span> (message) <span style="color:#3f8058">|</span>byte<span style="color:#3f8058">|</span> {
sum <span style="color:#3f8058">+=</span> byte;
}
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(sum <span style="color:#3f8058">==</span> <span style="color:#3daee9">'h'</span> <span style="color:#3f8058">+</span> <span style="color:#3daee9">'e'</span> <span style="color:#3f8058">+</span> <span style="color:#3daee9">'l'</span> <span style="color:#3f8058">*</span> <span style="color:#f67400">2</span> <span style="color:#3f8058">+</span> <span style="color:#3daee9">'o'</span>);
}
<span style="color:#7a7c7d">// use compile-time code to initialize an array</span>
<span style="color:#2980b9">var</span> fancy_array <span style="color:#3f8058">=</span> init<span style="color:#3f8058">:</span> {
<span style="color:#2980b9">var</span> initial_value<span style="color:#3f8058">:</span> [<span style="color:#f67400">10</span>]Point <span style="color:#3f8058">=</span> <span style="color:#27aeae;font-weight:bold">undefined</span>;
<span style="color:#fdbc4b;font-weight:bold">for</span> (initial_value) <span style="color:#3f8058">|*</span>pt<span style="color:#3f8058">,</span> i<span style="color:#3f8058">|</span> {
pt<span style="color:#3f8058">.*</span> <span style="color:#3f8058">=</span> Point{
<span style="color:#3f8058">.</span>x <span style="color:#3f8058">=</span> <span style="color:#7f8c8d">@intCast</span>(<span style="color:#2980b9">i32</span><span style="color:#3f8058">,</span> i)<span style="color:#3f8058">,</span>
<span style="color:#3f8058">.</span>y <span style="color:#3f8058">=</span> <span style="color:#7f8c8d">@intCast</span>(<span style="color:#2980b9">i32</span><span style="color:#3f8058">,</span> i) <span style="color:#3f8058">*</span> <span style="color:#f67400">2</span><span style="color:#3f8058">,</span>
};
}
<span style="color:#fdbc4b;font-weight:bold">break</span> <span style="color:#3f8058">:</span>init initial_value;
};
<span style="font-weight:bold">test</span> <span style="color:#f44f4f">"switch on non-exhaustive enum"</span> {
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(result);
<span style="color:#2980b9">const</span> is_one <span style="color:#3f8058">=</span> <span style="color:#fdbc4b;font-weight:bold">switch</span> (number) {
<span style="color:#3f8058">.</span>one <span style="color:#3f8058">=></span> <span style="color:#27aeae;font-weight:bold">true</span><span style="color:#3f8058">,</span>
<span style="color:#fdbc4b;font-weight:bold">else</span> <span style="color:#3f8058">=></span> <span style="color:#27aeae;font-weight:bold">false</span><span style="color:#3f8058">,</span>
};
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(is_one);
<span style="color:#2980b9">const</span> array_ptr <span style="color:#3f8058">=</span> array[<span style="color:#f67400">0</span><span style="color:#3f8058">..</span>array<span style="color:#3f8058">.</span>len];
<span style="color:#fdbc4b;font-weight:bold">if</span> (a <span style="color:#3f8058">!=</span> b) {
<span style="color:#fdbc4b;font-weight:bold">try</span> expect(<span style="color:#27aeae;font-weight:bold">true</span>);
} <span style="color:#fdbc4b;font-weight:bold">else</span> <span style="color:#fdbc4b;font-weight:bold">if</span> (a <span style="color:#3f8058">==</span> <span style="color:#f67400">9</span>) {
<span style="font-weight:bold">unreachable</span>;
} <span style="color:#fdbc4b;font-weight:bold">else</span> {
<span style="font-weight:bold">unreachable</span>;
}
}
<span style="font-weight:bold">fn</span> deferErrorExample(is_error<span style="color:#3f8058">:</span> <span style="color:#2980b9">bool</span>) <span style="color:#3f8058">!</span><span style="color:#2980b9">void</span> {
print(<span style="color:#f44f4f">"</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">start of function</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{});
<span style="color:#7a7c7d">// This will always be executed on exit</span>
<span style="color:#fdbc4b;font-weight:bold">defer</span> {
print(<span style="color:#f44f4f">"end of function</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{});
}
<span style="color:#fdbc4b;font-weight:bold">errdefer</span> {
print(<span style="color:#f44f4f">"encountered an error!</span><span style="color:#3daee9">\n</span><span style="color:#f44f4f">"</span><span style="color:#3f8058">,</span> <span style="color:#3f8058">.</span>{});
}
}
<span style="font-weight:bold">pub</span> <span style="font-weight:bold">fn</span> syscall3(number<span style="color:#3f8058">:</span> <span style="color:#2980b9">usize</span><span style="color:#3f8058">,</span> arg1<span style="color:#3f8058">:</span> <span style="color:#2980b9">usize</span><span style="color:#3f8058">,</span> arg2<span style="color:#3f8058">:</span> <span style="color:#2980b9">usize</span><span style="color:#3f8058">,</span> arg3<span style="color:#3f8058">:</span> <span style="color:#2980b9">usize</span>) <span style="color:#2980b9">usize</span> {
<span style="color:#fdbc4b;font-weight:bold">return</span> <span style="font-weight:bold">asm</span> <span style="color:#2980b9">volatile</span> (<span style="color:#f44f4f">"syscall"</span>
<span style="color:#3f8058">:</span> [ret] <span style="color:#f44f4f">"={rax}"</span> (<span style="color:#3f8058">-></span> <span style="color:#2980b9">usize</span>)
<span style="color:#3f8058">:</span> [number] <span style="color:#f44f4f">"{rax}"</span> (number)<span style="color:#3f8058">,</span>
[arg1] <span style="color:#f44f4f">"{rdi}"</span> (arg1)<span style="color:#3f8058">,</span>
[arg2] <span style="color:#f44f4f">"{rsi}"</span> (arg2)<span style="color:#3f8058">,</span>
[arg3] <span style="color:#f44f4f">"{rdx}"</span> (arg3)
<span style="color:#3f8058">:</span> <span style="color:#f44f4f">"rcx"</span><span style="color:#3f8058">,</span> <span style="color:#f44f4f">"r11"</span>
);
}
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