/** \brief Return the number of constants defined in a parser. */
API_EXPORT(int) mupGetConstNum(muParserHandle_t a_hParser)
{
MU_TRY
muParser_t* const p(AsParser(a_hParser));
const mu::valmap_type ValMap = p->GetConst();
return (int)ValMap.size();
MU_CATCH
return 0; // never reached
}
/** \brief Retrieve name and value of a single parser constant.
\param a_hParser [in] a valid parser handle
\param a_iVar [in] Index of the constant to query
\param a_pszName [out] pointer to a null terminated string with the constant name
\param [out] The constant value
*/
API_EXPORT(void) mupGetConst(muParserHandle_t a_hParser,
unsigned a_iVar,
const muChar_t **a_pszName,
muFloat_t *a_fVal)
{
// A static buffer is needed for the name since i cant return the
// pointer from the map.
static muChar_t szName[1024];
MU_TRY
muParser_t* const p(AsParser(a_hParser));
const mu::valmap_type ValMap = p->GetConst();
if (a_iVar >= ValMap.size())
{
*a_pszName = 0;
*a_fVal = 0;
return;
}
mu::valmap_type::const_iterator item;
item = ValMap.begin();
for (unsigned i = 0; i < a_iVar; ++i)
++item;
#ifndef _UNICODE
strncpy(szName, item->first.c_str(), sizeof(szName));
#else
wcsncpy(szName, item->first.c_str(), sizeof(szName));
#endif
szName[sizeof(szName)-1] = 0;
*a_pszName = &szName[0];
*a_fVal = item->second;
return;
MU_CATCH
*a_pszName = 0;
*a_fVal = 0;
}
