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Add ParmParse::eval #4142

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Sep 9, 2024
Merged

Add ParmParse::eval #4142

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23 changes: 23 additions & 0 deletions Src/Base/AMReX_ParmParse.H
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Original file line number Diff line number Diff line change
Expand Up @@ -1153,6 +1153,29 @@ public:
}
}

/*
* \brief Evaluate given string as math expression
*
* For unknown symbols, ParmParse database will be queried.
*/
template <typename T, std::enable_if_t<std::is_same_v<T,int> ||
std::is_same_v<T,long> ||
std::is_same_v<T,long long> ||
std::is_same_v<T,float> ||
std::is_same_v<T,double>,int> = 0>
T eval (std::string const& expr) const
{
if constexpr (std::is_integral_v<T>) {
auto const parser = this->makeIParser(expr, {});
auto const exe = parser.compileHost<0>();
return static_cast<T>(exe()); // In the future, we might add safety check.
} else {
auto const parser = this->makeParser(expr, {});
auto const exe = parser.compileHost<0>();
return static_cast<T>(exe());
}
}

/*
* \brief Query two names.
*
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