spdlog/src/details/log_msg_buffer.cpp

// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#include "spdlog/details/log_msg_buffer.h"

namespace spdlog {
namespace details {

// copy logger name and payload to buffer so can be used asynchronously
// note: source location pointers are copied without allocation since they
// are compiler generated const chars* (__FILE__, __LINE__, __FUNCTION__)
// if you pass custom strings to source location, make sure they outlive the log_msg_buffer
log_msg_buffer::log_msg_buffer(const log_msg &orig_msg)
    : log_msg{orig_msg} {
    buffer.append(logger_name);
    buffer.append(payload);
    update_string_views();
}

log_msg_buffer::log_msg_buffer(const log_msg_buffer &other)
    : log_msg{other} {
    buffer.append(logger_name);
    buffer.append(payload);
    update_string_views();
}

log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) noexcept
    : log_msg{other},
      buffer{std::move(other.buffer)} {
    update_string_views();
}

log_msg_buffer &log_msg_buffer::operator=(const log_msg_buffer &other) {
    log_msg::operator=(other);
    buffer.clear();
    buffer.append(other.buffer.data(), other.buffer.data() + other.buffer.size());
    update_string_views();
    return *this;
}

log_msg_buffer &log_msg_buffer::operator=(log_msg_buffer &&other) noexcept {
    log_msg::operator=(other);
    buffer = std::move(other.buffer);
    update_string_views();
    return *this;
}

void log_msg_buffer::update_string_views() {
    logger_name = string_view_t{buffer.data(), logger_name.size()};
    payload = string_view_t{buffer.data() + logger_name.size(), payload.size()};
}

}  // namespace details
}  // namespace spdlog