src/cpp-common/bt2c/std-int.hpp

   1 /*
   2  * Copyright (c) 2022 Philippe Proulx <pproulx@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  */
   6
   7 #ifndef BABELTRACE_CPP_COMMON_BT2C_STD_INT_HPP
   8 #define BABELTRACE_CPP_COMMON_BT2C_STD_INT_HPP
   9
  10 #include <cstdint>
  11
  12 namespace bt2c {
  13
  14 /*
  15  * Whether or not an integer is signed.
  16  */
  17 enum class Signedness
  18 {
  19     Unsigned,
  20     Signed,
  21 };
  22
  23 namespace internal {
  24
  25 template <std::size_t LenBitsV, Signedness SignednessV>
  26 struct StdIntTBase;
  27
  28 template <>
  29 struct StdIntTBase<8, Signedness::Signed>
  30 {
  31     using Type = std::int8_t;
  32 };
  33
  34 template <>
  35 struct StdIntTBase<8, Signedness::Unsigned>
  36 {
  37     using Type = std::uint8_t;
  38 };
  39
  40 template <>
  41 struct StdIntTBase<16, Signedness::Signed>
  42 {
  43     using Type = std::int16_t;
  44 };
  45
  46 template <>
  47 struct StdIntTBase<16, Signedness::Unsigned>
  48 {
  49     using Type = std::uint16_t;
  50 };
  51
  52 template <>
  53 struct StdIntTBase<32, Signedness::Signed>
  54 {
  55     using Type = std::int32_t;
  56 };
  57
  58 template <>
  59 struct StdIntTBase<32, Signedness::Unsigned>
  60 {
  61     using Type = std::uint32_t;
  62 };
  63
  64 template <>
  65 struct StdIntTBase<64, Signedness::Signed>
  66 {
  67     using Type = std::int64_t;
  68 };
  69
  70 template <>
  71 struct StdIntTBase<64, Signedness::Unsigned>
  72 {
  73     using Type = std::uint64_t;
  74 };
  75
  76 } /* namespace internal */
  77
  78 /*
  79  * Standard fixed-length integer type `Type` of length `LenBitsV` bits
  80  * and signedness `SignednessV`.
  81  *
  82  * `LenBitsV` must be one of 8, 16, 32, or 64.
  83  *
  84  * For example, `StdIntT<32, Signedness::Signed>` is `std::int32_t`.
  85  */
  86 template <std::size_t LenBitsV, Signedness SignednessV>
  87 using StdIntT = typename internal::StdIntTBase<LenBitsV, SignednessV>::Type;
  88
  89 } /* namespace bt2c */
  90
  91 #endif /* BABELTRACE_CPP_COMMON_BT2C_STD_INT_HPP */