templates

问题 I have some templates like the ones below that I can use to define simple expressions e.g. Expr<constant,int,int,1,1> = 2 Expr<sub, Expr<constant,int,int,1,1>, Expr<constant,int,int,2,0>, 1, 1> = x - 2. I want to define a meta-function that takes an Expr and returns another Expr that is a modified version of the one passed as input. The output will be based on the template arguments of the input so I guess I have to define multiple function templates that specialize different inputs.

问题 I have some templates like the ones below that I can use to define simple expressions e.g. Expr<constant,int,int,1,1> = 2 Expr<sub, Expr<constant,int,int,1,1>, Expr<constant,int,int,2,0>, 1, 1> = x - 2. I want to define a meta-function that takes an Expr and returns another Expr that is a modified version of the one passed as input. The output will be based on the template arguments of the input so I guess I have to define multiple function templates that specialize different inputs.

问题 Consider this simple check for whether a (global) function is defined: template <typename T> concept has_f = requires ( const T& t ) { Function( t ); }; // later use in MyClass<T>: if constexpr ( has_f<T> ) Function( value ); unfortunately this allows for implicit conversions . This is obviously a big risk for mess-ups. Question: How to check if Function( const T& t ) 'explicitly' exists? Something like if constexpr ( std::is_same_v<decltype( Function( t ) ), void> ) should be free of implict

问题 Consider this simple check for whether a (global) function is defined: template <typename T> concept has_f = requires ( const T& t ) { Function( t ); }; // later use in MyClass<T>: if constexpr ( has_f<T> ) Function( value ); unfortunately this allows for implicit conversions . This is obviously a big risk for mess-ups. Question: How to check if Function( const T& t ) 'explicitly' exists? Something like if constexpr ( std::is_same_v<decltype( Function( t ) ), void> ) should be free of implict

问题 I want to reuse the the ItemsControl from my ListView and its not really hard to put the ItemsControle into an Template. The problem is, I want to change the DataTemplate when I use my ItemsControlTemplate. <ListView DataContext="{Binding Input}"> <ItemsControl ItemsSource="{Binding Columns}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Horizontal"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <Grid

问题 I have this structure for my Wordpress site : Custom post type 1 Category a Term a-1 Term a-2 ... Custom post type 2 Category a (same category than CPT 1) Term a-1 Term a-2 ... I would like to have different template for "Category a" archive page and single term page depending of current post type. How can I achieve this? In other words, I want these URLs each have their own template : http://www.example.com/custom-post-type-1/category-a/ http://www.example.com/custom-post-type-1/category-a

问题 I have this structure for my Wordpress site : Custom post type 1 Category a Term a-1 Term a-2 ... Custom post type 2 Category a (same category than CPT 1) Term a-1 Term a-2 ... I would like to have different template for "Category a" archive page and single term page depending of current post type. How can I achieve this? In other words, I want these URLs each have their own template : http://www.example.com/custom-post-type-1/category-a/ http://www.example.com/custom-post-type-1/category-a

问题 I am using self-written template methods to load and save settings from/into Qt's QSettings . QSettings receive/return data of type QVariant and QVariant has constructors taking basic types like int and double , but not std::string . My template method can therefore easily be used for int and double , but when using std::string I get compile error messages that there is no matching function call, because there is no known conversion from std::__cxx11::basic_string<char> to the types accepted

问题 papis i have a dict here dict = {1: [1,2,3,4,5,6,7,8,9], 2: [2,4,5,6,7,8,9,0], 3: [5,2,4,6,12,3,7,6]} i want show it on my page so i using template as follows: {%for item in dict.items%} <tr> <td>{{item.0}}</td> {%for v in item.1%} here ,i dont know how to handle if last column and v >5 <td color = 'red'>{{v}}</td> else <td>{{v}}</td> {%endfor%} </tr> {%endfor%} as you see,i want the last column turn red text if its value is greater than 5 how can i realize this ,i google and found nothing

问题 It seems that my setup.typoscript is not working properly. The error: The page is not configured! [type=0][]. This means that there is no TypoScript object of type PAGE with typeNum=0 configured. my setup.typoscript: page = PAGE page.10 = TEXT page.10.value = HALLO Include in the backend are configured and shows the extension so sys_template.php works, but i do not know why it shows anything. The normal field from the template modul Setup works fine. TYPO3 9.5 Thank you. 回答1: Try renaming the