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0704ca0550
The logging streams now do almost no work when there is no output target for them. For example, if LL_VERBOSE has no output targets, then `verbosestream << x` will return a StreamProxy with a null target. Any further `<<` operations applied to it will do nothing.
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
/*
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Minetest
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Copyright (C) 2022 Minetest Authors
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#include <iostream>
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#include <string>
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#include <functional>
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template<int BufferLength, typename Emitter = std::function<void(const std::string &)> >
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class StringStreamBuffer : public std::streambuf {
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public:
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StringStreamBuffer(Emitter emitter) : m_emitter(emitter) {
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buffer_index = 0;
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}
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int overflow(int c) {
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push_back(c);
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return c;
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}
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void push_back(char c) {
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if (c == '\n' || c == '\r') {
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if (buffer_index)
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m_emitter(std::string(buffer, buffer_index));
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buffer_index = 0;
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} else {
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buffer[buffer_index++] = c;
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if (buffer_index >= BufferLength) {
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m_emitter(std::string(buffer, buffer_index));
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buffer_index = 0;
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}
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}
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}
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std::streamsize xsputn(const char *s, std::streamsize n) {
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for (int i = 0; i < n; ++i)
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push_back(s[i]);
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return n;
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}
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private:
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Emitter m_emitter;
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char buffer[BufferLength];
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int buffer_index;
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};
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class DummyStreamBuffer : public std::streambuf {
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int overflow(int c) {
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return c;
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}
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std::streamsize xsputn(const char *s, std::streamsize n) {
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return n;
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}
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};
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