spdlog/include/spitlog/formatter.h

#pragma once

#include "details/log_msg.h"
namespace spitlog
{
namespace details {
class flag_formatter;
}

class formatter
{
public:
    virtual ~formatter() {}
    virtual void format(details::log_msg& msg) = 0;
};

class pattern_formatter : public formatter
{

public:
    explicit pattern_formatter(const std::string& pattern);
    pattern_formatter(const pattern_formatter&) = delete;
    void format(details::log_msg& msg) override;
private:
    const std::string _pattern;
    std::vector<std::unique_ptr<details::flag_formatter>> _formatters;
    void handle_flag(char flag);
    void compile_pattern(const std::string& pattern);
};
}

#include "./details/pattern_formatter_impl.h"