diff options
Diffstat (limited to 'js/src/frontend/TypedIndex.h')
-rw-r--r-- | js/src/frontend/TypedIndex.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/frontend/TypedIndex.h b/js/src/frontend/TypedIndex.h new file mode 100644 index 0000000000..c75d59ae3d --- /dev/null +++ b/js/src/frontend/TypedIndex.h @@ -0,0 +1,42 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef frontend_TypedIndex_h +#define frontend_TypedIndex_h + +#include <cstdint> +#include <stddef.h> + +namespace js { +namespace frontend { + +// TypedIndex allows discrimination in variants between different +// index types. Used as a typesafe index for various stencil arrays. +template <typename Tag> +struct TypedIndex { + TypedIndex() = default; + constexpr explicit TypedIndex(uint32_t index) : index(index){}; + + uint32_t index = 0; + + // For Vector::operator[] + operator size_t() const { return index; } + + TypedIndex& operator=(size_t idx) { + index = idx; + return *this; + } + + bool operator<(TypedIndex other) const { return index < other.index; } + bool operator<=(TypedIndex other) const { return index <= other.index; } + bool operator>(TypedIndex other) const { return index > other.index; } + bool operator>=(TypedIndex other) const { return index >= other.index; } +}; + +} // namespace frontend +} // namespace js + +#endif |