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kernel: use C++11 fold hack to prevent recursion

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Eddie Hung 2020-03-15 09:47:20 -07:00
parent ba13a40ef4
commit 7bcbf0c9d1
1 changed files with 8 additions and 3 deletions
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11
kernel/rtlil.h
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@ -361,9 +361,14 @@ namespace RTLIL
// often one needs to check if a given IdString is part of a list (for example a list // often one needs to check if a given IdString is part of a list (for example a list
// of cell types). the following functions helps with that. // of cell types). the following functions helps with that.
template<typename T, typename... Args> template<typename... Args>
bool in(T first, Args... rest) const { bool in(Args... args) const {
return in(first) || in(rest...); //return in(first) || in(rest...);
// Credit: https://articles.emptycrate.com/2016/05/14/folds_in_cpp11_ish.html
bool result = false;
(void) std::initializer_list<int>{ (result = result || in(args), 0)... };
return result;
} }
bool in(IdString rhs) const { return *this == rhs; } bool in(IdString rhs) const { return *this == rhs; }