Question

目的是在CDevVS890中调用m_callback_fn时执行CVS890Executor :: do_full_frame。

以下是有罪的代码：

"CDevVS890.h"
typedef std::tr1::function<void (void* frame, int len)> DoFrameFn; 

class CDevVS890
{
public:
    CDevVS890();

    void receive();   

    DoFrameFn m_callback_fn;
}

"CDevVS890.cpp"
void CDevVS890::receive()
{
    ...
    m_callback_fn((void*)frame, (int)len);
}

/*----------------------------------------------------------------------*/

"CVS890Executor.h"
class CVS890Executor
{
public:
    CVS890Executor();

private:
    void hookup_to_DevVS890();
    void do_full_frame( void* frame, int len );
}

"CVS890Executor.cpp"
CVS890Executor::CVS890Executor()
{
    hookup_to_DevVS890();
}

void CVS890Executor::hookup_to_DevVS890()
{
m_pDevVS890 = new CDevVS890();
m_pDevVS890->m_callback_fn = 
    std::tr1::bind(&CVS890Executor::do_full_frame, this, _1);
}

void CVS890Executor::do_full_frame(void* frame, int len)
{
   ...
}

错误很多，很难阅读：

在/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1/functional:56中包含的文件中，来自../../src/Common/CDevVS890.h:17，来自CVS890Executor.h：13，来自CVS890Executor.cpp：8： /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional：在成员函数âtypenamestd:: tr1中：：result_of＆lt; _Functor（typename std :: tr1 :: result_of 0）＆gt;（_ Bound_args，std :: tr1 :: tuple＆lt; _UElements ...＆gt;）＆gt; :: type ...）＆gt; :: type std :: tr1 :: _ Bind＆lt; _Functor（_Bound_args ...）＆gt; :: __ call（const std :: tr1 :: tuple＆lt; _UElements ...＆gt;＆amp;，std :: tr1 :: _ Index_tuple＆lt; _Indexes ... ＆gt;）[with _Args = void *＆amp;，int＆amp;，int ... _ Indexes = 0,1，_Functor = std :: tr1 :: _ Mem_fn，_Bound_args = CVS890Executor *，std :: tr1 :: _ Placeholder＆lt; 1＆gt; ]一个： /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:1191：从âtypenamestd:: tr1实例化:: result_of＆lt; _Functor（typename std :: tr1 :: result_of 0）＆gt;（_ Bound_args，std :: tr1 :: tuple＆lt; _UElements ...＆gt;）＆gt; :: type ...）＆gt; :: type std :: tr1 :: _ Bind＆lt; _Functor（_Bound_args ...）＆gt; :: operator（）（_ Args＆amp; ...）[with _Args = void *，int，_Functor = std :: tr1 :: _ Mem_fn，_Bound_args = CVS890Executor *，std :: tr1 :: _占位符＆lt; 1＆gt;]â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:1668：从âstaticvoidstd实例化:: tr1 :: _ Function_handler :: _ M_invoke（const std :: tr1 :: _ Any_data＆amp;，_ ArgTypes ...）[with _Functor = std :: tr1 :: _ Bind（CVS890Executor *，std :: tr1 :: _ Placeholder＆lt; 1＆gt;）＆gt ;，_ ArgTypes = void *，int]â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:2005：从âstd:: tr1实例化：：function＆lt; _Res（_ArgTypes ...）＆gt; :: function（_Functor，typename __gnu_cxx :: __ enable_if＆lt;（！std :: tr1 :: is_integral :: value），std :: tr1 :: function＆lt; _Res（_ArgTypes。 ..）＆gt; :: 无用的＆gt; :: _type）[与_Functor = std :: tr1 :: _ Bind（CVS890Executor *，std :: tr1 :: _ Placeholder＆lt; 1＆gt;）＆gt;，_ Res = void，_ArgTypes = void *，int]â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:1885：从âtypename__gnu_cxx :: __ enable_if＆lt;实例化;（！std :: tr1 :: is_integral :: value），std :: tr1 :: function＆lt; _Res（ ArgTypes ...）＆gt;＆amp;＆gt; :: _type std :: tr1 :: function＆lt; _Res（_ArgTypes ...）＆gt; :: operator =（_ Functor）[with _Functor = std :: tr1 :: _ Bind（CVS890Executor *，std :: tr1 :: _ Placeholder＆lt; 1＆gt;）＆gt;，_ Res = void，_ArgTypes = void *，int]â CVS890Executor.cpp：115：从这里实例化 /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:1137：错误：呼叫不匹配â（std :: tr1 :: _ Mem_fn）（CVS890Executor *＆amp;，void *＆amp;）â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:546：注意：候选人是：_Res std :: tr1 :: _ Mem_fn＆lt; _Res（_Class :: *）（_ ArgTypes ...）＆gt; :: operator（）（_ Class＆amp;，_ ArgTypes ...）const [with _Res = void，_Class = CVS890Executor，_ArgTypes = void *，int] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:551:note:_Res std :: tr1 :: _ Mem_fn＆lt; _Res（_Class :: *）（_ ArgTypes ...）＆gt; :: operator（）（_ Class *，_ ArgTypes ...）const [with _Res = void，_Class = CVS890Executor，_ArgTypes = void *，int ] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/tr1_impl/functional:1137：错误：return-statement with a值，在函数返回'void' make： * [CVS890Executor.o]错误1

知道这有什么问题吗？

干杯

Answer 1

你忘记了第二个论点。您对bind函数的调用应该是这样的：

std::tr1::bind(&CVS890Executor::do_full_frame, this, _1, _2);
//                                                       ^^

Answer 2

在CVS890Executor :: hookup_to_DevVS890（）中，您没有将任何参数绑定到成员函数do_full_frame。

您还尝试将函数的返回值赋给m_callback_fn，但声明do_full_frame（）返回void（无返回值）。

使用tr1 :: function时编译错误

2 个答案: