ceph/src/jaegertracing/opentelemetry-cpp/api/include/opentelemetry/std/utility.h

   1 // Copyright The OpenTelemetry Authors
   2 // SPDX-License-Identifier: Apache-2.0
   3
   4 #pragma once
   5
   6 #include "opentelemetry/version.h"
   7
   8 #include <cstddef>
   9 #include <utility>
  10
  11 OPENTELEMETRY_BEGIN_NAMESPACE
  12 // Standard Type aliases in nostd namespace
  13 namespace nostd
  14 {
  15
  16 //
  17 // Backport of std::data
  18 //
  19 // See https://en.cppreference.com/w/cpp/iterator/data
  20 //
  21 template <class C>
  22 auto data(C &c) noexcept(noexcept(c.data())) -> decltype(c.data())
  23 {
  24   return c.data();
  25 }
  26
  27 template <class C>
  28 auto data(const C &c) noexcept(noexcept(c.data())) -> decltype(c.data())
  29 {
  30   return c.data();
  31 }
  32
  33 template <class T, std::size_t N>
  34 T *data(T (&array)[N]) noexcept
  35 {
  36   return array;
  37 }
  38
  39 template <class E>
  40 const E *data(std::initializer_list<E> list) noexcept
  41 {
  42   return list.begin();
  43 }
  44
  45 //
  46 // Backport of std::size
  47 //
  48 // See https://en.cppreference.com/w/cpp/iterator/size
  49 //
  50 template <class C>
  51 auto size(const C &c) noexcept(noexcept(c.size())) -> decltype(c.size())
  52 {
  53   return c.size();
  54 }
  55
  56 template <class T, std::size_t N>
  57 std::size_t size(T (&array)[N]) noexcept
  58 {
  59   return N;
  60 }
  61
  62 template <std::size_t N>
  63 using make_index_sequence = std::make_index_sequence<N>;
  64
  65 template <std::size_t... Ints>
  66 using index_sequence = std::index_sequence<Ints...>;
  67
  68 }  // namespace nostd
  69 OPENTELEMETRY_END_NAMESPACE