src/detail/number_string.hpp

100.0% Lines (25/25) 100.0% Functions (6/6)

Line	Hits	Source Code
1		//
2		// Copyright (c) 2019 Vinnie Falco ([email protected])
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	37	construct_unsigned(
31		std::uint64_t n) noexcept
32		{
33	37	buf_[buf_size] = '\0';
34	37	auto const end =
35		&buf_[buf_size];
36	37	auto p = end;
37	37	if(n == 0)
38		{
39	6	*--p = '0';
40		}
41		else
42		{
43	74	while(n > 0)
44		{
45	43	*--p = '0' + (n%10);
46	43	n /= 10;
47		}
48		}
49	37	size_ = end - p;
50	37	}
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	37	number_string(
61		std::uint64_t n) noexcept
62	37	{
63	37	construct_unsigned(n);
64	37	}
65
66		char const*
67	37	data() const noexcept
68		{
69	37	return &buf_[
70	37	buf_size] - size_;
71		}
72
73		std::size_t
74	37	size() const noexcept
75		{
76	37	return size_;
77		}
78
79		core::string_view
80	37	str() const noexcept
81		{
82	37	return core::string_view(
83	37	data(), size());
84		}
85
86	37	operator
87		core::string_view() const noexcept
88		{
89	37	return str();
90		}
91		};
92
93		} // detail
94		} // http
95		} // boost
96
97		#endif
98