libs/url/src/detail/print.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/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_DETAIL_PRINT_HPP | ||
| 11 | #define BOOST_URL_DETAIL_PRINT_HPP | ||
| 12 | |||
| 13 | #include <cstdint> | ||
| 14 | #include <type_traits> | ||
| 15 | |||
| 16 | namespace boost { | ||
| 17 | namespace urls { | ||
| 18 | namespace detail { | ||
| 19 | |||
| 20 | // std::uint64_t | ||
| 21 | // 18446744073709551615 | ||
| 22 | // 1 2 | ||
| 23 | template<class T> | ||
| 24 | struct printed | ||
| 25 | : std::false_type | ||
| 26 | { | ||
| 27 | }; | ||
| 28 | |||
| 29 | // 16-bit unsigned | ||
| 30 | template<> | ||
| 31 | class printed<std::uint16_t> | ||
| 32 | : std::false_type | ||
| 33 | { | ||
| 34 | char n_; | ||
| 35 | char buf_[5]; | ||
| 36 | |||
| 37 | public: | ||
| 38 | 25 | printed(std::uint16_t n) | |
| 39 | 25 | { | |
| 40 | 25 | char* it = | |
| 41 | 25 | buf_ + sizeof(buf_); | |
| 42 |
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25 | if(n == 0) |
| 43 | { | ||
| 44 | 16 | *--it = '0'; | |
| 45 | 16 | n_ = 1; | |
| 46 | } | ||
| 47 | else | ||
| 48 | { | ||
| 49 |
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45 | while(n > 0) |
| 50 | { | ||
| 51 | 36 | *--it = '0' + (n % 10); | |
| 52 | 36 | n /= 10; | |
| 53 | } | ||
| 54 | 9 | n_ = static_cast<char>( | |
| 55 | 9 | sizeof(buf_) - ( | |
| 56 | 9 | it - buf_)); | |
| 57 | } | ||
| 58 | 25 | } | |
| 59 | |||
| 60 | core::string_view | ||
| 61 | 75 | string() const noexcept | |
| 62 | { | ||
| 63 | 150 | return core::string_view(buf_ + | |
| 64 | 75 | sizeof(buf_) - n_, n_); | |
| 65 | } | ||
| 66 | }; | ||
| 67 | |||
| 68 | template<class T> | ||
| 69 | printed<T> | ||
| 70 | 25 | make_printed(T t) | |
| 71 | { | ||
| 72 | 25 | return printed<T>(t); | |
| 73 | } | ||
| 74 | |||
| 75 | } // detail | ||
| 76 | } // urls | ||
| 77 | } // boost | ||
| 78 | |||
| 79 | #endif | ||
| 80 |