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Howto:Extend Nasal: Difference between revisions
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→Hash Manipulation API
m (→Hash Manipulation API: using a HASHSET macro) |
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int naMember_cget(naRef obj, const char* field, naRef* out); | int naMember_cget(naRef obj, const char* field, naRef* out); | ||
A common way to set hash field members easily, is using a simple macro like: | A common way to set up hash field members easily, is using a simple macro like: | ||
<syntaxhighlight lang="C"> | <syntaxhighlight lang="C"> | ||
#define HASHSET(s,l,n) naHash_set( | #define HASHSET(s,l,n) naHash_set(naHash, naStr_fromdata(naNewString(c),s,l),n) | ||
//... do your hash setup here | //... do your hash setup here | ||
#undef HASHSET | #undef HASHSET | ||
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As you can see, this allows you to easily set up hash fields. | As you can see, this allows you to easily set up hash fields. | ||
This will call the naHash_set() helper, with the target hash being its first argument, the key name coming next and the naRef (n) being last. | |||
The macro can be even further simplified by automatically computing the length of the hash key using strlen() instead of the explicit length argument: | The macro can be even further simplified by automatically computing the length of the hash key using strlen() instead of the explicit length argument: | ||
<syntaxhighlight lang="C"> | <syntaxhighlight lang="C"> | ||
#define HASHSET(s,n) naHash_set( | #define HASHSET(s,n) naHash_set(naHash, naStr_fromdata(naNewString(c),s,strlen(s)),n) | ||
//... do your hash setup here | //... do your hash setup here | ||
#undef HASHSET | #undef HASHSET | ||