68 lines
1.6 KiB
Markdown
68 lines
1.6 KiB
Markdown
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---
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id: inline
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title: Inlining
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---
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import Syntax from '@theme/Syntax';
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When compiling a contract in LIGO some functions get inlined in the place where
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they are used and some are not. Inlining a function often results in larger
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contracts and is therefore not aggressively done.
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In some cases you might want to override the default behaviour of LIGO and
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force inlining.
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## Inline attribute
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To force inlining you can use the inline attribute.
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<Syntax syntax="pascaligo">
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```pascaligo
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function fst(const p : nat * nat) : nat is p.0; attributes ["inline"] ;
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function main(const p : nat * nat; const s : nat * nat) : list(operation) * (nat * nat) is
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((list end : list(operation)), (fst(p.0,p.1), fst(s.1,s.0)))
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```
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</Syntax>
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<Syntax syntax="cameligo">
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```cameligo
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let fst (p: (nat * nat)) : nat = p.0 [@@inline]
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let main (p : (nat * nat)) (s : (nat * nat)) : (operation list * (nat * nat)) =
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(([]: operation list), (fst (p.0, p.1), fst (s.1, s.0)))
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```
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</Syntax>
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<Syntax syntax="reasonligo">
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```reasonligo
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[@inline]
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let fst = (p: (nat, nat)) : nat => p[0]
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let main = (p : (nat, nat), s : (nat, nat)) : (list(operation), (nat, nat)) =>
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(([]: list(operation)), (fst((p[0], p[1])), fst((s[1], s[0]))))
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```
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</Syntax>
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Now if we measure the difference between inlining and without inlining, using
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`ligo measure-contract name_of_contract.ligo <entrypoint>`, we see the
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following results:
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<table>
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<tr>
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<td>With inlining</td><td>66 bytes</td>
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</tr>
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<tr>
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<td>Without inlining</td><td>170 bytes</td>
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</tr>
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</table>
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:::info
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Note that these results can change due to ongoing work to optimize output of
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the LIGO compiler.
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:::
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