Boost Spirit调试输出未出现

如何解决Boost Spirit调试输出未出现

我正在尝试this question的第二个答案。解析本身可以正常工作，但是在第一行取消对#define BOOST_SPIRIT_DEBUG的注释后，BOOST_SPIRIT_DEBUG输出仍然不会出现在任何地方。

当我将下面的这3行添加到main()时，我看到所有3行都出现在终端中。但是，我看不到任何解析器调试行。缺少什么？

std::cout << "Hello cout" << std::endl;
std::cerr << "Hello cerr" << std::endl;
BOOST_SPIRIT_DEBUG_OUT << "Hello boost spirit debug out" << std::endl;

也许值得一提，我正在使用Qt Creator。

解决方法

我无法复制：

Live On Coliru

#define BOOST_SPIRIT_DEBUG
#include <boost/spirit/include/qi.hpp>

int main() {
    std::cout << "Hello cout" << std::endl;
    std::cerr << "Hello cerr" << std::endl;
    BOOST_SPIRIT_DEBUG_OUT << "Hello boost spirit debug out" << std::endl;
}

打印

Hello cout
Hello cerr
Hello boost spirit debug out

所有常见的罪魁祸首是：

• 过时建造
• 运行与生成的二进制文件不同的二进制文件
• 预编译的标题毁了您的一天？当您在预编译标头包含之前包含任何内容时，[在我知道的任何编译器中]都会导致警告，但请注意以防万一。

以下是第二个答案演示 Live On Coliru 与调试输出（或without）的链接：

<expr_>
  <try>-99</try>
  <function_call_>
    <try>-99</try>
    <fail/>
  </function_call_>
  <value_>
    <try>-99</try>
    <success></success>
    <attributes>[-99]</attributes>
  </value_>
  <success></success>
  <attributes>[-99]</attributes>
</expr_>
input:  -99
eval:   -99

<expr_>
  <try>'string'</try>
  <function_call_>
    <try>'string'</try>
    <fail/>
  </function_call_>
  <value_>
    <try>'string'</try>
    <string_>
      <try>'string'</try>
      <success></success>
      <attributes>[[s,t,r,i,n,g]]</attributes>
    </string_>
    <success></success>
    <attributes>[[s,g]]</attributes>
  </value_>
  <success></success>
  <attributes>[[s,g]]</attributes>
</expr_>
input:  'string'
eval:   string

<expr_>
  <try>AnswerToLTUAE()</try>
  <function_call_>
    <try>AnswerToLTUAE()</try>
    <success></success>
    <attributes>[42]</attributes>
  </function_call_>
  <success></success>
  <attributes>[42]</attributes>
</expr_>
input:  AnswerToLTUAE()
eval:   42

<expr_>
  <try>ReverseString('strin</try>
  <function_call_>
    <try>ReverseString('strin</try>
    <expr_>
      <try>'string')</try>
      <function_call_>
        <try>'string')</try>
        <fail/>
      </function_call_>
      <value_>
        <try>'string')</try>
        <string_>
          <try>'string')</try>
          <success>)</success>
          <attributes>[[s,g]]</attributes>
        </string_>
        <success>)</success>
        <attributes>[[s,g]]</attributes>
      </value_>
      <success>)</success>
      <attributes>[[s,g]]</attributes>
    </expr_>
    <success></success>
    <attributes>[[g,s]]</attributes>
  </function_call_>
  <success></success>
  <attributes>[[g,s]]</attributes>
</expr_>
input:  ReverseString('string')
eval:   gnirts

<expr_>
  <try>Concatenate('string'</try>
  <function_call_>
    <try>Concatenate('string'</try>
    <expr_>
      <try>'string',987)</try>
      <function_call_>
        <try>'string',987)</try>
        <fail/>
      </function_call_>
      <value_>
        <try>'string',987)</try>
        <string_>
          <try>'string',987)</try>
          <success>,987)</success>
          <attributes>[[s,g]]</attributes>
        </string_>
        <success>,987)</success>
        <attributes>[[s,g]]</attributes>
      </value_>
      <success>,987)</success>
      <attributes>[[s,g]]</attributes>
    </expr_>
    <expr_>
      <try> 987)</try>
      <function_call_>
        <try> 987)</try>
        <fail/>
      </function_call_>
      <value_>
        <try> 987)</try>
        <success>)</success>
        <attributes>[987]</attributes>
      </value_>
      <success>)</success>
      <attributes>[987]</attributes>
    </expr_>
    <success></success>
    <attributes>[[s,g,9,8,7]]</attributes>
  </function_call_>
  <success></success>
  <attributes>[[s,7]]</attributes>
</expr_>
input:  Concatenate('string',987)
eval:   string987

<expr_>
  <try>Concatenate('The Ans</try>
  <function_call_>
    <try>Concatenate('The Ans</try>
    <expr_>
      <try>'The Answer Is ',An</try>
      <function_call_>
        <try>'The Answer Is ',An</try>
        <fail/>
      </function_call_>
      <value_>
        <try>'The Answer Is ',An</try>
        <string_>
          <try>'The Answer Is ',An</try>
          <success>,AnswerToLTUAE())</success>
          <attributes>[[T,h,e,A,s,w,I,]]</attributes>
        </string_>
        <success>,AnswerToLTUAE())</success>
        <attributes>[[T,]]</attributes>
      </value_>
      <success>,AnswerToLTUAE())</success>
      <attributes>[[T,]]</attributes>
    </expr_>
    <expr_>
      <try> AnswerToLTUAE())</try>
      <function_call_>
        <try> AnswerToLTUAE())</try>
        <success>)</success>
        <attributes>[42]</attributes>
      </function_call_>
      <success>)</success>
      <attributes>[42]</attributes>
    </expr_>
    <success></success>
    <attributes>[[T,4,2]]</attributes>
  </function_call_>
  <success></success>
  <attributes>[[T,2]]</attributes>
</expr_>
input:  Concatenate('The Answer Is ',AnswerToLTUAE())
eval:   The Answer Is 42