预定义大量代替值

#property copyright "Copyright © 2009, MetaQuotes Software Corp."
#property link      "https://www.metaquotes.net"
//+------------------------------------------------------------------+
//| 专家初始化函数                                                     |
//+------------------------------------------------------------------+
void OnInit()
  {
//--- EA交易初始化输出信息示例
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
//--- 设置定时器事件间的间隔
   EventSetTimer(5);
//---
  }
//+------------------------------------------------------------------+
//| 专家无法初始化函数                                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//--- EA交易无法初始化输出信息示例
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
//---
  }
//+------------------------------------------------------------------+
//| 专家订单号函数                                                     |
//+------------------------------------------------------------------+
void OnTick()
  {
//--- 订单收据输出信息
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
   test1(__FUNCTION__);
   test2();
//---
  }
//+------------------------------------------------------------------+
//| test1                                                            |
//+------------------------------------------------------------------+
void test1(string par)
  {
//--- 函数内部信息输出
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__," par=",par);
  }
//+------------------------------------------------------------------+
//| test2                                                            |
//+------------------------------------------------------------------+
void test2()
  {
//--- 函数内部信息输出
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
  }
//+------------------------------------------------------------------+
//| OnTimer event handler                                            |
//+------------------------------------------------------------------+
void OnTimer()
  {
//---
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
   test1(__FUNCTION__);
  }

//--- 创建一个宏，以便在日志中快速显示表达式及其值
#define print(expr) Print(#expr,"=",expr)
 
//--- 通过预定义的__COUNTER__宏定义MACRO_COUNTER自定义宏
#define MACRO_COUNTER __COUNTER__
 
//--- 使用__COUNTER__宏设置变量的输入值
input int InpVariable = __COUNTER__;
 
//--- 定义函数之前，使用__COUNTER__宏设置全局变量的值
int ExtVariable = __COUNTER__;
 
//+------------------------------------------------------------------+
//| 函数返回__COUNTER__值                                             |
//+------------------------------------------------------------------+
int GlobalFunc(void)
  {
   return(__COUNTER__);
  }
//+------------------------------------------------------------------+
//| 模板函数返回__COUNTER__值                                          |
//+------------------------------------------------------------------+
template<typename T>
int GlobalTemplateFunc(void)
  {
   return(__COUNTER__);
  }
//+------------------------------------------------------------------+
//| 方法返回__COUNTER__的结构                                          |
//+------------------------------------------------------------------+
struct A
  {
   int               dummy;  // not used
 
   int               Method(void)
     {
      return(__COUNTER__);
     }
  };
//+------------------------------------------------------------------+
//| 方法返回__COUNTER__的模板结构                                       |
//+------------------------------------------------------------------+
template<typename T>
struct B
  {
   int               dummy;  // not used
 
   int               Method(void)
     {
      return(__COUNTER__);
     }
  };
//+------------------------------------------------------------------+
//| 模板方法返回__COUNTER__的结构                                       |
//+------------------------------------------------------------------+
struct C
  {
   int               dummy;  // not used
 
   template<typename T>
   int               Method(void)
     {
      return(__COUNTER__);
     }
  };
//+------------------------------------------------------------------+
//| 函数#2，返回__COUNTER__值                                          |
//+------------------------------------------------------------------+
int GlobalFunc2(void)
  {
   return(__COUNTER__);
  }
//+------------------------------------------------------------------+
//| 脚本程序起始函数                                                    |
//+------------------------------------------------------------------+
void OnStart(void)
  {
// 宏和变量中的__COUNTER__
   print(MACRO_COUNTER);
   print(InpVariable);
   print(ExtVariable);
 
//--- 函数中的__COUNTER__
   print(GlobalFunc());
   print(GlobalFunc());                // 该值没有更改
   print(GlobalTemplateFunc<int>());
   print(GlobalTemplateFunc<int>());   // the value is not changed
   print(GlobalTemplateFunc<double>());// 该值已更改
   print(GlobalFunc2());
   print(GlobalFunc2());               // 该值没有更改
 
// 结构中的__COUNTER__
   A a1, a2;
   print(a1.Method());
   print(a2.Method());                 // 该值没有更改
 
// 模板结构中的__COUNTER__
   B<int> b1, b2;
   B<double> b3;
   print(b1.Method());
   print(b2.Method());                 // 该值没有更改
   print(b3.Method());                 // 该值已更改
 
// 模板函数结构中的__COUNTER__
   C c1, c2;
   print(c1.Method<int>());
   print(c1.Method<double>());         // 该值已更改
   print(c2.Method<int>());            // 与第一个c1.Method<int>()调用中的相同值
 
//--- 让我们再看一下宏和全局变量中的__COUNTER__
   print(MACRO_COUNTER);  //该值已更改
   print(ExtGlobal2);
  }
//--- 定义函数之后，使用__COUNTER__宏设置全局变量的值
int ExtGlobal2 = __COUNTER__;
//+------------------------------------------------------------------+
 
/* Result
   __COUNTER__=3
   InpVariable=0
   ExtVariable=1
   GlobalFunc()=5
   GlobalFunc()=5
   GlobalTemplateFunc<int>()=8
   GlobalTemplateFunc<int>()=8
   GlobalTemplateFunc<double>()=9
   GlobalFunc2()=7
   GlobalFunc2()=7
   a1.Method()=6
   a2.Method()=6
   b1.Method()=10
   b2.Method()=10
   b3.Method()=11
   c1.Method<int>()=12
   c1.Method<double>()=13
   c2.Method<int>()=12
   __COUNTER__=4
   ExtGlobal2=2
 
*/