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Transform a specific type of argument using templates


Transform a specific type of argument using templates

By : CG.Son
Date : November 22 2020, 03:01 PM
should help you out Fleshing out what Sam Varshavchik said
code :
template<typename T>
T&& transform(T&& t) { return std::forward<T>(t); }

special_vector<LibraryClass> transform(const std::vector<LibraryClass>& v)
{
    return {v};
}

template<typename Fn, typename... Args>
void U(Fn f, Args&&... args)
{
    f(std::forward<Args>(transform(args))...);
}


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Variadic templates: iterate over type/template argument

Variadic templates: iterate over type/template argument


By : M.Elsayed
Date : March 29 2020, 07:55 AM
like below fixes the issue You don't want to iterate over the types, you want to create a parameter pack and expand it in a variadic template. You have an array, so the pack you want is a pack of integers 0,1,2... to serve as array indices.
code :
#include <redi/index_tuple.h>

template<typename Ret, typename... Args>
struct Function
{
  Ret (*wrapped_function)(Args...);

  template<unsigned... I>
  Ret dispatch(void* args[], redi::index_tuple<I...>)
  {
    return wrapped_function(*static_cast<Args*>(args[I])...);
  }

  void CallbackBind(Ret * ret, void * args[])
  {
    *ret = dispatch(args, to_index_tuple<Args...>());
  }
};
Transform the type from argument to template in C++

Transform the type from argument to template in C++


By : CarrotCries
Date : March 29 2020, 07:55 AM
seems to work fine I am refactoring some old code that used its own type handling system which provided a special macro for a type to be used as an argument:
code :
template< class Type >
void function( int x ) {}

#define TYPE( t ) t()
template< class Type >
void function( Type, int x ) { function< Type >( x ); }
template< class Type >
void function( int ) {}

template< class Type >
struct TypeCarrier {};

#define TYPE( t ) TypeCarrier< t >()
template< class Type >
void function( TypeCarrier< Type >, int x ) { function< Type >( x ); }

int main()
{
    function( TYPE( double ), 1 );
    function( TYPE( void ), 2 );
}
Passing Class as a Non-type argument in templates in c++

Passing Class as a Non-type argument in templates in c++


By : Marco Calautti
Date : March 29 2020, 07:55 AM
this one helps. There are three types of template parameters:
Type parameters, for which a type has to be provided as an argument (e.g. int, std::string, etc.). In your example, H is a type parameter; Non-type parameters, for which a value has to be provided as an argument (e.g. 42). Your example does not contain any of these; Template parameters, for which a class template (accepting the right number and type of parameters) has to be provided. In your example, A is a template parameter.
code :
template<double D>
struct X { /* ... */ };
template<int* P>
struct X { /* ... */ };
int main()
{
    int x = 42;
    X<&x> obj; // ERROR!
}
std::vector<my_class> v;
c++ templates call specific constructor for specific type of class

c++ templates call specific constructor for specific type of class


By : Elizabeth Perez
Date : March 29 2020, 07:55 AM
I wish this helpful for you First off you need to learn about member initializer lists: C++ initializes object directly. So you’d have a ctor like this:
code :
Node::Node(std::string const& value)
    : value(value) // this line will need adjustment; see below
    , leftChild(nullptr)
    , rightChild(nullptr) {
}
Node::Node(std::string const& value)
    : value(boost::lexical_cast<T>(value))
    , leftChild(nullptr)
    , rightChild(nullptr) {
}
Node::Node(std::string const& value)
    : value(my_convert<T>(value))
    , leftChild(nullptr)
    , rightChild(nullptr) {
}
template <typename T>
T my_convert(std::string const& value) {
    return boost::lexical_cast<T>(value);
}
template <>
int my_convert<int>(std::string const& value) {
    return std::stoi(value);
}
How to get Visual Studio to transform specific T4 Templates on build?

How to get Visual Studio to transform specific T4 Templates on build?


By : user2250071
Date : March 29 2020, 07:55 AM
help you fix your problem Add a condition to the metadata item for the template you don't want to transform as follows:
code :
<Content Include="TextTemplate2.tt" >
  <Generator Condition="$(BuildingInsideVisualStudio)=='true'">TextTemplatingFileGenerator</Generator>
  <LastGenOutput>TextTemplate2.txt</LastGenOutput>
</Content>
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