Jiacai Liu jiacai2050

C++各版本核心特性快速使用指南（附极简示例）

结合C++演进路径，聚焦各版本最实用、工业界高频使用的核心特性，每个特性配可直接运行的极简示例，兼顾语法理解和快速上手，从基础到现代C++逐步推进，适配开发实践需求。

一、探索期（C with Classes/Early C++）：C++基础核心（1980-1985）

这一阶段的特性是C++的底层基础，后续所有版本均完全兼容，是入门和开发的必备核心，无编译器版本限制。

1. 类（class）+ 封装 + 构造/析构函数（C with Classes 1980）

核心作用：C++面向对象的基础，将数据和操作数据的函数封装为一个整体，解决C语言无面向对象能力的问题。示例：

#include

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Starting Points

How to use this gist

You've got two main options:

Docker Hub 镜像加速器

国内从 Docker Hub 拉取镜像有时会遇到困难，此时可以配置镜像加速器。Docker 官方和国内很多云服务商都提供了国内加速器服务。

Dockerized 实践 https://github.com/y0ngb1n/dockerized

配置加速地址

Ubuntu 16.04+、Debian 8+、CentOS 7+

CPU Usage :

(1 - avg(irate(node_cpu_seconds_total{mode="idle"}[10m])) by (instance)) * 100

Memory Usage :

100 * (1 - ((avg_over_time(node_memory_MemFree_bytes[10m]) + avg_over_time(node_memory_Cached_bytes[10m]) + avg_over_time(node_memory_Buffers_bytes[10m])) / avg_over_time(node_memory_MemTotal_bytes[10m])))

	const std = @import("std");
	pub const c = @cImport({
	@cInclude("rocksdb/c.h");
	});

	const key = "hello";
	const value = "world";

	pub fn main() !void {
	const opts = c.rocksdb_options_create();

	const std = @import("std");

	const BIND_HOST: []const u8 = "0.0.0.0";
	const BIND_PORT: u16 = 8090;
	const NUM_WORKER_THREADS: u32 = 16;
	const DOWNLOAD_DIR: []const u8 = "/tmp";
	const MAX_FILE_SIZE: usize = 1024 * 1024 * 500; // 500M
	// const UPSTREAM_URL: []const u8 = "https://fs.liujiacai.net/zigbuilds";
	const UPSTREAM_URL: []const u8 = "https://ziglang.org";

	wget 'https://github.com/google/flatbuffers/archive/refs/tags/v24.3.25.tar.gz'

	tar xzf flatbuffers-24.3.25.tar.gz
	pushd flatbuffers-24.3.25
	cmake -G "Unix Makefiles"
	make
	make install
	ldconfig
	flatc --version
	rm -rf flatbuffers-24.3.25

	/*
	* Demo of libpq.
	* Build: g++ libpq-demo.cc -o libpq-demo -lpq
	* Run: ./libpq-demo
	*/

	#include <arpa/inet.h>
	#include <iostream>
	#include <libpq-fe.h>
	#include <sstream>

	package main

	import (
	"encoding/xml"
	"flag"
	"fmt"
	"go-apps/pkg/flagx"
	"go-apps/pkg/util"
	"io"
	"log"