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// Copyright 2021 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
namespace pw::bytes {
// Size constants for bytes in powers of two as defined by IEC 60027-2 A.2 and
// ISO/IEC 80000:13-2008:
// Kibibytes (KiB): 1024^1 or 2^10
inline constexpr unsigned long long int kBytesInKibibyte = 1ull << 10;
// Mebibytes (MiB): 1024^2 or 2^20
inline constexpr unsigned long long int kBytesInMibibyte = 1ull << 20;
// Gibibytes (GiB): 1024^3 or 2^30
inline constexpr unsigned long long int kBytesInGibibyte = 1ull << 30;
// Tebibytes (TiB): 1024^4 or 2^40
inline constexpr unsigned long long int kBytesInTebibyte = 1ull << 40;
// Pebibytes (PiB): 1024^5 or 2^50
inline constexpr unsigned long long int kBytesInPebibyte = 1ull << 50;
// Exbibytes (EiB): 1024^6 or 2^60
inline constexpr unsigned long long int kBytesInExbibyte = 1ull << 60;
namespace unit_literals {
// Helper user-defined literals for specifying a number of bytes in powers of
// two, as defined by IEC 60027-2 A.2 and ISO/IEC 80000:13-2008.
//
// The supported prefixes include:
// _B for bytes (1024^0)
// _KiB for kibibytes (1024^1)
// _MiB for mibibytes (1024^2)
// _GiB for gibibytes (1024^3)
// _TiB for tebibytes (1024^4)
// _PiB for pebibytes (1024^5)
// _EiB for exbibytes (1024^6)
//
// In order to use these you must use a using namespace directive, for example:
//
// #include "pw_bytes/units.h"
//
// using namespace pw::bytes::unit_literals;
//
// constepxr size_t kRandomBufferSizeBytes = 1_MiB + 42_KiB;
constexpr unsigned long long int operator""_B(unsigned long long int bytes) {
return bytes;
}
constexpr unsigned long long int operator""_KiB(
unsigned long long int kibibytes) {
return kibibytes * kBytesInKibibyte;
}
constexpr unsigned long long int operator""_MiB(
unsigned long long int mibibytes) {
return mibibytes * kBytesInMibibyte;
}
constexpr unsigned long long int operator""_GiB(
unsigned long long int gibibytes) {
return gibibytes * kBytesInGibibyte;
}
constexpr unsigned long long int operator""_TiB(
unsigned long long int tebibytes) {
return tebibytes * kBytesInTebibyte;
}
constexpr unsigned long long int operator""_PiB(
unsigned long long int pebibytes) {
return pebibytes * kBytesInPebibyte;
}
constexpr unsigned long long int operator""_EiB(
unsigned long long int exbibytes) {
return exbibytes * kBytesInExbibyte;
}
} // namespace unit_literals
} // namespace pw::bytes
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