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Spaces for the table, not tabs.

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Tod Beardsley 2013-11-13 16:48:19 -06:00
parent e2dd13e7f8
commit 6549b2e347
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1 changed files with 11 additions and 10 deletions
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21
HACKING
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@ -65,16 +65,17 @@ The '<<' operator is significantly faster. The difference will become
even more apparent when doing string manipulation in a loop. The
following table approximates the underlying implementation:
Ruby Pseudo-C
----------- ----------------
a = b + c a = malloc(b.len+c.len+1);
strcpy(a, b);
memcpy(a+b.len, c, c.len);
a[b.len + c.len] = '\0';
a = b a = b;
a << c a = realloc(a, a.len+c.len+1);
memcpy(a+a.len, c, c.len);
a[a.len + c.len] = '\0';
Ruby Pseudo-C
----------- ----------------
a = b + c a = malloc(b.len+c.len+1);
strcpy(a, b);
memcpy(a+b.len, c, c.len);
a[b.len + c.len] = '\0';
a = b a = b;
a << c a = realloc(a, a.len+c.len+1);
memcpy(a+a.len, c, c.len);
a[a.len + c.len] = '\0';
Note that the original value of 'b' is lost in the second case. Care
must be taken to duplicate strings that you do not want to modify.