In the C++ standard library, because the class inheritance relationship is more complicated and templates are used more often, the source code is filled with the three keywords typename, typedef and using. 1. typename keyword 1.1. The first function of typename is to be used in templates to declare a certain type. template<typename _Tp, typename […]
Tag: typename
SFINAE template instantiation and specialization template and typename
std::void_t SFINAE (Substitution Failure Is Not An Error), its function is to select the correct template when we specialize the template to avoid failure Reprinted C++ Template Advanced Guide std::enable_if boost::mpl boost metaprogramming library 1. Function template Click to view the code #include <iostream> template <typename T> T const & amp; Max(T const & amp; […]
[Solved] dedecms dream weaving background generates error Call to undefined function GetTopTypename()
This is because the function GetTopTypename() is called in the template, and there is no error caused by this function in your program. We can add this function to it. Open /include/extend.func.php and add it at the bottom if(!function_exists(‘GetTopTypename’)) { function GetTopTypename($id) { global $dsql; $row = $dsql->GetOne(“SELECT typename,topid FROM dede_arctype WHERE id= $id”); if […]
[Solved] Service [Xlint:invalidAbsoluteTypeName] error —- resolved
Exception encountered during context initialization – cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userService’ defined in class path resource [springapplicationContext.xml]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: warning no match for this type name: Service [Xlint:invalidAbsoluteTypeName] Exception in thread “main” org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘userService’ defined in class path resource […]
[Solved] C++ use typename to fix template compilation errors
Origin of the problem When looking at the Unreal Engine source code, there is a line of code that I am puzzled by: // This is the code I want to call // Called to bind functionality to input void AMyCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent) {<!– –> Super::SetupPlayerInputComponent(PlayerInputComponent); // I need to create a function corresponding to the […]