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Use std::variant to implement pytree Key #6701

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Merged
merged 5 commits into from
Nov 12, 2024
Merged

Use std::variant to implement pytree Key #6701

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Use std::variant to implement pytree Key
swolchok Nov 7, 2024
ae9b018
Update on "Use std::variant to implement pytree Key"
swolchok Nov 7, 2024
bb4af91
Update on "Use std::variant to implement pytree Key"
swolchok Nov 7, 2024
03541d3
Update on "Use std::variant to implement pytree Key"
swolchok Nov 8, 2024
fc103c0
Update on "Use std::variant to implement pytree Key"
swolchok Nov 12, 2024
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42 changes: 14 additions & 28 deletions extension/pytree/pytree.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include <cstring>
#include <memory>
#include <string>
#include <variant>

// NB: This is a local, pytree FunctionRef and not from the ExecuTorch runtime.
#include <executorch/extension/pytree/function_ref.h>
Expand Down Expand Up @@ -55,51 +56,36 @@ using KeyInt = int32_t;
struct Key {
enum class Kind : uint8_t { None, Int, Str } kind_;

KeyInt as_int_ = {};
KeyStr as_str_ = {};
private:
std::variant<std::monostate, KeyInt, KeyStr> repr_;

Key() : kind_(Kind::None) {}
/*implicit*/ Key(KeyInt key) : kind_(Kind::Int), as_int_(std::move(key)) {}
/*implicit*/ Key(KeyStr key) : kind_(Kind::Str), as_str_(std::move(key)) {}
public:
Key() {}
/*implicit*/ Key(KeyInt key) : repr_(key) {}
/*implicit*/ Key(KeyStr key) : repr_(std::move(key)) {}

const Kind& kind() const {
return kind_;
Kind kind() const {
return static_cast<Kind>(repr_.index());
}

const KeyInt& as_int() const {
pytree_assert(kind_ == Key::Kind::Int);
return as_int_;
KeyInt as_int() const {
return std::get<KeyInt>(repr_);
}

operator const KeyInt&() const {
operator KeyInt() const {
return as_int();
}

const KeyStr& as_str() const {
pytree_assert(kind_ == Key::Kind::Str);
return as_str_;
return std::get<KeyStr>(repr_);
}

operator const KeyStr&() const {
return as_str();
}

bool operator==(const Key& rhs) const {
if (kind_ != rhs.kind_) {
return false;
}
switch (kind_) {
case Kind::Str: {
return as_str_ == rhs.as_str_;
}
case Kind::Int: {
return as_int_ == rhs.as_int_;
}
case Kind::None: {
return true;
}
}
pytree_unreachable();
return repr_ == rhs.repr_;
}

bool operator!=(const Key& rhs) const {
Expand Down
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