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[FFI] Use fold expression to simplify for_each #18116

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Merged
Hzfengsy merged 1 commit into from
Jul 5, 2025
Merged

[FFI] Use fold expression to simplify for_each #18116

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15 changes: 4 additions & 11 deletions ffi/include/tvm/ffi/base_details.h
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Original file line number Diff line number Diff line change
Expand Up @@ -136,23 +136,16 @@ namespace ffi {
namespace details {

// for each iterator
template <bool stop, std::size_t I, typename F>
struct for_each_dispatcher {
template <typename T, typename... Args>
static void run(const F& f, T&& value, Args&&... args) { // NOLINT(*)
f(I, std::forward<T>(value));
for_each_dispatcher<sizeof...(Args) == 0, (I + 1), F>::run(f, std::forward<Args>(args)...);
template <typename F, typename... Args, size_t... I>
static void run(std::index_sequence<I...>, const F& f, Args&&... args) { // NOLINT(*)
(f(I, std::forward<Args>(args)), ...);
}
};

template <std::size_t I, typename F>
struct for_each_dispatcher<true, I, F> {
static void run(const F&) {} // NOLINT(*)
};

template <typename F, typename... Args>
void for_each(const F& f, Args&&... args) { // NOLINT(*)
for_each_dispatcher<sizeof...(Args) == 0, 0, F>::run(f, std::forward<Args>(args)...);
for_each_dispatcher::run(std::index_sequence_for<Args...>{}, f, std::forward<Args>(args)...);
}

/*!
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