src/dawn/common/ityp_stack_vec.h

// Copyright 2020 The Dawn & Tint Authors
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#ifndef SRC_DAWN_COMMON_ITYP_STACK_VEC_H_
#define SRC_DAWN_COMMON_ITYP_STACK_VEC_H_

#include <limits>
#include <vector>

#include "absl/container/inlined_vector.h"
#include "dawn/common/Assert.h"
#include "dawn/common/UnderlyingType.h"

namespace dawn::ityp {

template <typename Index, typename Value, size_t StaticCapacity>
class stack_vec : private absl::InlinedVector<Value, StaticCapacity> {
    using I = UnderlyingType<Index>;
    using Base = absl::InlinedVector<Value, StaticCapacity>;
    static_assert(StaticCapacity <= std::numeric_limits<I>::max());

  public:
    stack_vec() : Base() {}
    explicit stack_vec(Index size) : Base() { Base::resize(static_cast<I>(size)); }

    Value& operator[](Index i) {
        DAWN_ASSERT(i < size());
        return Base::operator[](static_cast<I>(i));
    }

    constexpr const Value& operator[](Index i) const {
        DAWN_ASSERT(i < size());
        return Base::operator[](static_cast<I>(i));
    }

    void resize(Index size) { Base::resize(static_cast<I>(size)); }

    void reserve(Index size) { Base::reserve(static_cast<I>(size)); }

    Value* data() { return Base::data(); }

    const Value* data() const { return Base::data(); }

    Index size() const { return Index(static_cast<I>(Base::size())); }
};

}  // namespace dawn::ityp

#endif  // SRC_DAWN_COMMON_ITYP_STACK_VEC_H_