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func TestAABB(t *testing.T) {
	t.Logf("size of map = %d", unsafe.Sizeof(map[int]int{}))
	var a any = gsdb.DbUser{}
	var typ = reflectutil.TypeOf(a)
	var n = (int(typ.PtrBytes)/8 + 7) / 8
	var sb strings.Builder
	var ones = 0
	for i := 0; i < n; i++ {
		var ptr = unsafe.Add(unsafe.Pointer(typ.GCData), i)
		var v = *(*uint8)(ptr)

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Go development environment on Windows with MSYS2

Normally, it is sufficient to grab the Go MSI installer from the website in order to set up the toolchain. However, some packages that provide Go wrappers for C libraries rely on cgo tool, which in turn, needs the GCC toolchain in order to build the glue code. Also, 3rd-party dependencies are usually hosted on services like GitHub, thus Git is also needed. This mini-guide illustrates how to setup a convenient development environment on Windows using MSYS2.

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import xlrd
import openpyxl


# 读取指定xls文件的某一个sheet
def read_workbook_sheet_to_rows(filename: str, sheet_name: str):
    print('load workbook', filename)
    if filename.endswith('.xls'):
        return __xlrd_read_workbook_sheet_to_rows(filename, sheet_name)

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package main

import (
    "fmt"
    "os"
    "path/filepath"
)

var print = fmt.Println

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// Validate if a given string is numeric.
// https://leetcode.com/problems/valid-number/

bool isNumber(const char* s)
{
    if (s == NULL)
    {
        return false;
    }

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/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class tutorial_myfirstapp_MainActivity */

#ifndef _Included_tutorial_myfirstapp_MainActivity
#define _Included_tutorial_myfirstapp_MainActivity
#ifdef __cplusplus
extern "C" {
#endif
/*

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local socket = require 'socket'
local coroutine = coroutine

local threads = {}

local function receive(connection)
    connection:settimeout(0)
    local s, status, partial = connection:receive(2^10)
    if status == 'timeout' then

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local coroutine = coroutine

local function receive(p)
    local s, value = coroutine.resume(p)
    return value
end

local function send(x)
    coroutine.yield(x)
end

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-- map(table, function)
-- e.g: map({1,2,3}, function(a) return a*2 end) -> {2,4,6}
function map(tbl, func)
    local newtbl = {}
    for i,v in pairs(tbl) do
        newtbl[i] = func(v)
    end
    return newtbl
end

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#include <assert.h>
#include <stdint.h>
#include <string>
#include <iostream>
#include <thread>
#include <chrono>
#include <zmq.h>
#include <zmq_utils.h>