Pointers and references: Difference between revisions
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=={{header|PARI/GP}}== |
=={{header|PARI/GP}}== |
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Some built-in functions like <code>issquare</code> have pointer arguments: |
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<lang parigp>n=1; |
<lang parigp>n=1; |
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issquare(9,&n); |
issquare(9,&n); |
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print(n); \\ prints 3</lang> |
print(n); \\ prints 3</lang> |
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{{Works with|PARI/GP|2.12.0}} |
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User functions and certain built-in functions (listput, listpop, mapput, etc.; all those with [http://pari.math.u-bordeaux.fr/dochtml/html-stable/usersch5.html#GP-prototypes-parser-codes parser code] W) can take arguments by reference with the prefix ~ operator: |
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<lang parigp>boxit(~L, x)=listput(L, x); |
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S=List(); |
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boxit(S,1); |
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S</lang> |
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{{out}} |
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<pre>1</pre> |
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Pari program can use C pointers normally. In fact, all GEN variables are actually pointers to a space within the Pari stack (or, rarely, the Pari heap). |
Pari program can use C pointers normally. In fact, all GEN variables are actually pointers to a space within the Pari stack (or, rarely, the Pari heap). |
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