C ++ for_each中的成员函数指针 [英] Member function pointer in C++ for_each

问题描述

我正在为一个学校项目开发一个小型的虚拟机器，它应该像dc命令一样工作，并且由输入输出元件，芯片组，一个Cpu和Ram组成。我目前正在研究芯片组，我已经实现了一个小解析类，以便能够从标准输入或文件中获取一些Asm指令，然后将这些指令推送到Cpu。

问题是：我的指令被排序在一个std :: list中，我希望能够通过foreach指令来逐一推送它们。为此，我需要能够将我的成员函数push_instruction作为for_each的函数指针F来调用;我无法找到诀窍...

有什么想法？
这里是我的代码：

  / * 
 **将监督
 **的函数输入的lexing和解析（无论是std_input还是文件描述符）
 **操作数和操作符的内存推送
 **并将命令执行到Cpu的指令
 * / 
 void Chipset :: startExecution（）
 {
 / * 
 **解析
 **指令
 ** 
 * / 
 
 for_each（this-> _instructList.begin（），this-> _instructList.end（），this-> pushInstruction）; 
 
 
 $ b void Chipset :: pushInstruction（instructionList *指令）
 {
 if（指令 - > opCode == PUSH）
 this-> _processor-> pushOperand（指令 - >值，Memory :: OPERAND，Memory :: BACK）; 
 else if（instruction-> opCode == ASSERT）
 this-> _processor-> pushOperand（指令 - >值，Memory :: ASSERT，Memory :: BACK）; 
 else 
 this-> _processor-> pushOperation（instruction-> opCode）; 
 
  

解决方案

  std :: for_each（
 _instructList.begin（），
 _instructList.end（），
 std :: bind1st（std :: mem_fun（& Chipset :: pushInstruction），这个））; 
  

I'm developing a small Virtual Machine in C++ for a school project, which should work like dc command, and is composed of a Input Output element, a Chipset, a Cpu and Ram. I'm currently working on the chipset, in which I've implemented a little parsing class in order to be able to get some Asm instructions from standard input or file, and then push this instructions to the Cpu.

The problem is: my instructions are sorted in a std::list, and I'd like to be able to push them each by each with a foreach instruction. To do that I need to be able to call my member function "push_instruction" as the function pointer F of for_each; and I wasn't able to find the trick to do that...

Any ideas? here's my code:

/*
** Function which will supervise
** the lexing and parsing of the input (whether it's std_input or a file descriptor)
** the memory pushing of operands and operators
** and will command the execution of instructions to the Cpu
*/
void                    Chipset::startExecution()
{
    /*
    ** My parsing 
    ** Instructions
    **
    */

    for_each(this->_instructList.begin(), this->_instructList.end(), this->pushInstruction);
}


void                    Chipset::pushInstruction(instructionList* instruction)
{
    if (instruction->opCode == PUSH)
      this->_processor->pushOperand(instruction->value, Memory::OPERAND, Memory::BACK);
    else if (instruction->opCode == ASSERT)
      this->_processor->pushOperand(instruction->value, Memory::ASSERT, Memory::BACK);
    else
      this->_processor->pushOperation(instruction->opCode);
}

解决方案

std::for_each(
    _instructList.begin(), 
    _instructList.end(), 
    std::bind1st(std::mem_fun(&Chipset::pushInstruction), this));

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