ceph/src/seastar/include/seastar/core/print.hh

   1 /*
   2  * This file is open source software, licensed to you under the terms
   3  * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
   4  * distributed with this work for additional information regarding copyright
   5  * ownership.  You may not use this file except in compliance with the License.
   6  *
   7  * You may obtain a copy of the License at
   8  *
   9  *   http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing,
  12  * software distributed under the License is distributed on an
  13  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  14  * KIND, either express or implied.  See the License for the
  15  * specific language governing permissions and limitations
  16  * under the License.
  17  */
  18 /*
  19  * Copyright (C) 2014 Cloudius Systems, Ltd.
  20  */
  21
  22 #pragma once
  23
  24 #include <fmt/ostream.h>
  25 #include <fmt/printf.h>
  26 #include <iostream>
  27 #include <iomanip>
  28 #include <chrono>
  29 #include <sstream>
  30 #include <seastar/core/sstring.hh>
  31
  32 #if 0
  33 inline
  34 std::ostream&
  35 operator<<(std::ostream& os, const void* ptr) {
  36     auto flags = os.flags();
  37     os << "0x" << std::hex << reinterpret_cast<uintptr_t>(ptr);
  38     os.flags(flags);
  39     return os;
  40 }
  41 #endif
  42
  43 inline
  44 std::ostream&
  45 operator<<(std::ostream&& os, const void* ptr) {
  46     return os << ptr; // selects non-rvalue version
  47 }
  48
  49 namespace seastar {
  50
  51 template <typename... A>
  52 [[deprecated("use std::format_to() or fmt::print()")]]
  53 std::ostream&
  54 fprint(std::ostream& os, const char* fmt, A&&... a) {
  55     ::fmt::fprintf(os, fmt, std::forward<A>(a)...);
  56     return os;
  57 }
  58
  59 template <typename... A>
  60 [[deprecated("use std::format_to() or fmt::print()")]]
  61 void
  62 print(const char* fmt, A&&... a) {
  63     ::fmt::printf(fmt, std::forward<A>(a)...);
  64 }
  65
  66 template <typename... A>
  67 [[deprecated("use std::format() or fmt::format()")]]
  68 std::string
  69 sprint(const char* fmt, A&&... a) {
  70     std::ostringstream os;
  71     ::fmt::fprintf(os, fmt, std::forward<A>(a)...);
  72     return os.str();
  73 }
  74
  75 template <typename... A>
  76 [[deprecated("use std::format() or fmt::format()")]]
  77 std::string
  78 sprint(const sstring& fmt, A&&... a) {
  79     std::ostringstream os;
  80     ::fmt::fprintf(os, fmt.c_str(), std::forward<A>(a)...);
  81     return os.str();
  82 }
  83
  84 template <typename Iterator>
  85 std::string
  86 format_separated(Iterator b, Iterator e, const char* sep = ", ") {
  87     std::string ret;
  88     if (b == e) {
  89         return ret;
  90     }
  91     ret += *b++;
  92     while (b != e) {
  93         ret += sep;
  94         ret += *b++;
  95     }
  96     return ret;
  97 }
  98
  99 template <typename TimePoint>
 100 struct usecfmt_wrapper {
 101     TimePoint val;
 102 };
 103
 104 template <typename TimePoint>
 105 inline
 106 usecfmt_wrapper<TimePoint>
 107 usecfmt(TimePoint tp) {
 108     return { tp };
 109 };
 110
 111 template <typename Clock, typename Rep, typename Period>
 112 std::ostream&
 113 operator<<(std::ostream& os, usecfmt_wrapper<std::chrono::time_point<Clock, std::chrono::duration<Rep, Period>>> tp) {
 114     auto usec = std::chrono::duration_cast<std::chrono::microseconds>(tp.val.time_since_epoch()).count();
 115     std::ostream tmp(os.rdbuf());
 116     tmp << std::setw(12) << (usec / 1000000) << "." << std::setw(6) << std::setfill('0') << (usec % 1000000);
 117     return os;
 118 }
 119
 120 template <typename... A>
 121 void
 122 log(A&&... a) {
 123     std::cout << usecfmt(std::chrono::high_resolution_clock::now()) << " ";
 124     print(std::forward<A>(a)...);
 125 }
 126
 127 /**
 128  * Evaluate the formatted string in a native fmt library format
 129  *
 130  * @param fmt format string with the native fmt library syntax
 131  * @param a positional parameters
 132  *
 133  * @return sstring object with the result of applying the given positional
 134  *         parameters on a given format string.
 135  */
 136 template <typename... A>
 137 sstring
 138 format(const char* fmt, A&&... a) {
 139     fmt::memory_buffer out;
 140 #if FMT_VERSION >= 80000
 141     fmt::format_to(fmt::appender(out), fmt::runtime(fmt), std::forward<A>(a)...);
 142 #else
 143     fmt::format_to(out, fmt, std::forward<A>(a)...);
 144 #endif
 145     return sstring{out.data(), out.size()};
 146 }
 147
 148 // temporary, use fmt::print() instead
 149 template <typename... A>
 150 [[deprecated("use std::format() or fmt::print()")]]
 151 std::ostream&
 152 fmt_print(std::ostream& os, const char* format, A&&... a) {
 153     fmt::print(os, format, std::forward<A>(a)...);
 154     return os;
 155 }
 156
 157 }