C ++ Visual Studio 2015“非标准语法;使用'&'创建指向成员的指针“ [英] C++ Visual Studio 2015 “non-standard syntax; use '&' to create a pointer to member”
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问题描述
我使用TaskScheduler COM,这是我的代码:
typedef HRESULT(* FuncOfBoll )(_ Out_VARIANT_BOOL * b);
static bool GetBool(FuncOfBoll func)
{
VARIANT_BOOL b = VARIANT_FALSE;
HRESULT hr = func(& b);
if(FAILED(hr))return FALSE;
return b == VARIANT_TRUE;
}
void test(ITaskSettings * settings)
{
bool b = GetBool(settings-> get_StopIfGoingOnBatteries); //< =这里的错误
// ...
}
我收到以下错误:
错误C3867'ITaskSettings :: get_StopIfGoingOnBatteries':非标准
语法;使用'&'创建指向成员的指针
我的错误是什么以及如何纠正?
解决方案
成员函数的指针的正确定义是:
typedef HRESULT(ITaskSettings :: * FuncOfBoll)(_ Out_ VARIANT_BOOL * b);
然后,您应该将指针传递给对象实例,以便函数 GetBool
:
static bool GetBool(ITaskSettings * setting,FuncOfBoll func)
{
VARIANT_BOOL b = VARIANT_FALSE;
HRESULT hr =(setting-> * func)(& b);
...
}
模板< class C>
static bool GetBool(C * p,HRESULT(C :: * func)(_ Out_VARIANT_BOOL *))
{
VARIANT_BOOL b = VARIANT_FALSE;
HRESULT hr =(p-> * func)(& b);
$ b b
void test(ITaskSettings * settings)
{
currentSetttings = settings;
bool b = GetBool(settings,& ITaskSettings :: mb_function);
}
I work with TaskScheduler COM, this is my code:
typedef HRESULT(*FuncOfBoll)(_Out_ VARIANT_BOOL* b);
static bool GetBool(FuncOfBoll func)
{
VARIANT_BOOL b = VARIANT_FALSE;
HRESULT hr = func(&b);
if (FAILED(hr)) return FALSE;
return b == VARIANT_TRUE;
}
void test(ITaskSettings* settings)
{
bool b = GetBool(settings->get_StopIfGoingOnBatteries); // <= The error here
// ...
}
and I get the following error:
Error C3867 'ITaskSettings::get_StopIfGoingOnBatteries': non-standard
syntax; use '&' to create a pointer to member
What is my mistake and how to correct it?
解决方案 The correct definition for a pointer to member function is:
typedef HRESULT(ITaskSettings::*FuncOfBoll)(_Out_ VARIANT_BOOL* b);
Then, you should pass the pointer to the object instance to function GetBool
:
static bool GetBool(ITaskSettings* setting, FuncOfBoll func)
{
VARIANT_BOOL b = VARIANT_FALSE;
HRESULT hr = (setting->*func)(&b);
...
}
Or, with template:
template<class C>
static bool GetBool(C* p, HRESULT(C::*func)(_Out_ VARIANT_BOOL*))
{
VARIANT_BOOL b = VARIANT_FALSE;
HRESULT hr = (p->*func)(&b);
...
}
Invocation:
void test(ITaskSettings* settings)
{
currentSetttings = settings;
bool b = GetBool(settings, &ITaskSettings::mb_function);
}
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