使用内存映射替换文件内容

最新推荐文章于 2022-09-18 22:20:42 发布

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最新推荐文章于 2022-09-18 22:20:42 发布 · 置顶 · 355 阅读

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CC 4.0 BY-SA版权

template <class T>
class single_instance {
public:
    static inline T instance() { 
        static T obj;
        return obj;
    }
private:
    single_instance() = default;
    virtual ~single_instance() = default;
};

#include <string.h>
#include <string>
#include "single_instance.hpp"
class string_utility {
public:
    void replace_all(std::string &origin_str, const char *pattern, const char *val) {
        size_t size = strlen(val);
        std::string::size_type pos = 0;
        while (pos != std::string::npos) {
            pos = origin_str.find(pattern, pos);
            if (std::string::npos == pos) {
                break;
            }
            origin_str.replace(pos, size, val);
            pos += size;
        }
    }
};

#define  G_STRING_UTILITY single_instance<string_utility>::instance()

#pragma once
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#