641034075b
We can use sstring as an argument to sprint. In some cases, we already have the string in a variable and end up being forced to call c_str() from the caller site. Accepting sstring as a parameter makes for a cleaner interface. Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
126 lines
3.1 KiB
C++
126 lines
3.1 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#ifndef PRINT_HH_
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#define PRINT_HH_
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#include <boost/format.hpp>
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#include <iostream>
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#include <iomanip>
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#include <chrono>
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#include "core/sstring.hh"
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inline void
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apply_format(boost::format& fmt) {
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}
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template <typename A0, typename... Arest>
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inline void
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apply_format(boost::format& fmt, A0&& a0, Arest&&... arest) {
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apply_format(fmt % std::forward<A0>(a0), std::forward<Arest>(arest)...);
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}
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template <typename... A>
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std::ostream&
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fprint(std::ostream& os, boost::format& fmt, A&&... a) {
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apply_format(fmt, std::forward<A>(a)...);
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return os << fmt;
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}
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template <typename... A>
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void
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print(boost::format& fmt, A&&... a) {
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fprint(std::cout, fmt, std::forward<A>(a)...);
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}
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template <typename... A>
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std::ostream&
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fprint(std::ostream& os, const char* fmt, A&&... a) {
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boost::format bfmt(fmt);
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return fprint(os, bfmt, std::forward<A>(a)...);
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}
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template <typename... A>
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void
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print(const char* fmt, A&&... a) {
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boost::format bfmt(fmt);
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return print(bfmt, std::forward<A>(a)...);
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}
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template <typename... A>
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std::string
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sprint(const char* fmt, A&&... a) {
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boost::format bfmt(fmt);
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apply_format(bfmt, std::forward<A>(a)...);
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return bfmt.str();
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}
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template <typename... A>
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std::string
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sprint(const sstring& fmt, A&&... a) {
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return sprint(fmt.c_str(), std::forward<A>(a)...);
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}
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template <typename Iterator>
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std::string
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format_separated(Iterator b, Iterator e, const char* sep = ", ") {
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std::string ret;
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if (b == e) {
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return ret;
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}
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ret += *b++;
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while (b != e) {
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ret += sep;
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ret += *b++;
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}
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return ret;
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}
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template <typename TimePoint>
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struct usecfmt_wrapper {
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TimePoint val;
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};
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template <typename TimePoint>
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inline
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usecfmt_wrapper<TimePoint>
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usecfmt(TimePoint tp) {
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return { tp };
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};
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template <typename Clock, typename Rep, typename Period>
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std::ostream&
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operator<<(std::ostream& os, usecfmt_wrapper<std::chrono::time_point<Clock, std::chrono::duration<Rep, Period>>> tp) {
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auto usec = std::chrono::duration_cast<std::chrono::microseconds>(tp.val.time_since_epoch()).count();
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std::ostream tmp(os.rdbuf());
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tmp << std::setw(12) << (usec / 1000000) << "." << std::setw(6) << std::setfill('0') << (usec % 1000000);
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return os;
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}
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template <typename... A>
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void
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log(A&&... a) {
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std::cout << usecfmt(std::chrono::high_resolution_clock::now()) << " ";
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print(std::forward<A>(a)...);
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}
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#endif /* PRINT_HH_ */
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