最近用 WTL 写 Ribbon 界面，发现一个坑。

先看 WTL9.1 的代码

static void (CharFormat::*Getk_[])(IPropertyStore*) = {    &CharFormat::Getk_Family,     &CharFormat::Getk_FontProperties_Size,     &CharFormat::Getk_MaskEffect
    
     ,    &CharFormat::Getk_MaskEffect
     
      ,    &CharFormat::Getk_MaskEffect
      
       ,    &CharFormat::Getk_MaskEffect
       
        ,    &CharFormat::Getk_VerticalPositioning,     &CharFormat::Getk_Color
        
         ,     &CharFormat::Getk_Color
         
          , &CharFormat::Getk_ColorType
          
           , &CharFormat::Getk_ColorType
           
            ,};
           
          
         
        
       
      
     
    

其中 Getk_MaskEffect 是个模版函数，实现如下：

template 
    
     void Getk_MaskEffect(IPropertyStore* pStore){    if (SUCCEEDED(pStore->GetValue(key, &propvar)))    {        UIPropertyToUInt32(key, propvar, &uValue);        if ((UI_FONTPROPERTIES)uValue != UI_FONTPROPERTIES_NOTAVAILABLE)        {            dwMask |= t_dwMask;            dwEffects |= ((UI_FONTPROPERTIES) uValue == UI_FONTPROPERTIES_SET) ? t_dwEffects : 0;        }    }	}
    

然后，在 VS2017 编译失败了……

1>X:\WTL91_5321_Final\Include\atlribbon.h(422): error C2440: 'initializing': cannot convert from 'overloaded-function' to 'void (__thiscall WTL::RibbonUI::CharFormat::* )(IPropertyStore *)'

1>X:\WTL91_5321_Final\Include\atlribbon.h(422): note: None of the functions with this name in scope match the target type

然后根据错误提示搜到：Cannot take address of template function，，翻译一下：模版函数的地址转化，分两步走，第一步先转具化，第二步转目标类型，这样可以；直接转过去不可以！

再来看看 WTL10 怎么解决这个问题的！

static void (CharFormat::*Getk_[])(IPropertyStore*) = {    &CharFormat::Getk_Family,     &CharFormat::Getk_FontProperties_Size,     &CharFormat::Getk_MaskEffectBold,    &CharFormat::Getk_MaskEffectItalic,    &CharFormat::Getk_MaskEffectUnderline,    &CharFormat::Getk_MaskEffectStrikeout,    &CharFormat::Getk_VerticalPositioning,    &CharFormat::Getk_Color,     &CharFormat::Getk_ColorBack,     &CharFormat::Getk_ColorType,    &CharFormat::Getk_ColorTypeBack,};

原来的模版函数，已经替换成普通函数了……

void Getk_MaskEffectBold(IPropertyStore* pStore){    Getk_MaskEffectAll(pStore, CFM_BOLD, CFE_BOLD, UI_PKEY_FontProperties_Bold);}void Getk_MaskEffectItalic(IPropertyStore* pStore){    Getk_MaskEffectAll(pStore, CFM_ITALIC, CFE_ITALIC, UI_PKEY_FontProperties_Italic);}void Getk_MaskEffectUnderline(IPropertyStore* pStore){    Getk_MaskEffectAll(pStore, CFM_UNDERLINE, CFE_UNDERLINE, UI_PKEY_FontProperties_Underline);}void Getk_MaskEffectStrikeout(IPropertyStore* pStore){    Getk_MaskEffectAll(pStore, CFM_STRIKEOUT, CFE_STRIKEOUT, UI_PKEY_FontProperties_Strikethrough);}void Getk_MaskEffectAll(IPropertyStore* pStore, DWORD _dwMask, DWORD _dwEffects, REFPROPERTYKEY key){    if (SUCCEEDED(pStore->GetValue(key, &propvar)))    {        UIPropertyToUInt32(key, propvar, &uValue);        if ((UI_FONTPROPERTIES)uValue != UI_FONTPROPERTIES_NOTAVAILABLE)        {            dwMask |= _dwMask;            dwEffects |= ((UI_FONTPROPERTIES)uValue == UI_FONTPROPERTIES_SET) ? _dwEffects : 0;        }    }}