libs/http/src/detail/number_string.hpp

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1			//
2			// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
3			//
4			// Distributed under the Boost Software License, Version 1.0. (See accompanying
5			// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6			//
7			// Official repository: https://github.com/CPPAlliance/http
8			//
9
10			#ifndef BOOST_HTTP_DETAIL_NUMBER_STRING_HPP
11			#define BOOST_HTTP_DETAIL_NUMBER_STRING_HPP
12
13			#include <boost/http/detail/config.hpp>
14			#include <boost/core/detail/string_view.hpp>
15			#include <cstdint>
16
17			namespace boost {
18			namespace http {
19			namespace detail {
20
21			// Convert integer to decimal
22			// string using in-place storage
23			class number_string
24			{
25			static constexpr unsigned buf_size = 18;
26			char buf_[buf_size + 1];
27			std::size_t size_ = 0;
28
29			void
30		36	construct_unsigned(
31			std::uint64_t n) noexcept
32			{
33		36	buf_[buf_size] = '\0';
34		36	auto const end =
35			&buf_[buf_size];
36		36	auto p = end;
37	2/2 ✓ Branch 0 taken 6 times. ✓ Branch 1 taken 30 times.	36	if(n == 0)
38			{
39		6	*--p = '0';
40			}
41			else
42			{
43	2/2 ✓ Branch 0 taken 42 times. ✓ Branch 1 taken 30 times.	72	while(n > 0)
44			{
45		42	*--p = '0' + (n%10);
46		42	n /= 10;
47			}
48			}
49		36	size_ = end - p;
50		36	}
51
52			public:
53			number_string() = default;
54			number_string(
55			number_string const&) = default;
56			number_string& operator=
57			(number_string const&) = default;
58
59			explicit
60		36	number_string(
61			std::uint64_t n) noexcept
62		36	{
63		36	construct_unsigned(n);
64		36	}
65
66			char const*
67		36	data() const noexcept
68			{
69		36	return &buf_[
70		36	buf_size] - size_;
71			}
72
73			std::size_t
74		36	size() const noexcept
75			{
76		36	return size_;
77			}
78
79			core::string_view
80		36	str() const noexcept
81			{
82		36	return core::string_view(
83		36	data(), size());
84			}
85
86		36	operator
87			core::string_view() const noexcept
88			{
89		36	return str();
90			}
91			};
92
93			} // detail
94			} // http
95			} // boost
96
97			#endif
98