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Intro to Templates and Concepts

seeplus (6591)
Geckoo (362)
Interesting. I really like the explanations about Template Overloading and specific ones ++

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#include <iostream>

template<typename T>
void foo(T t) {
    std::cout << "Generic foo(T t) for " << typeid(t).name() << std::endl;
}

template<typename T>
void foo(T* t) {
    std::cout << "Specific foo(T* t) for " << typeid(t).name() << std::endl;
}

int main()
{
    foo(7);
    foo(1.234567);
    foo((void*)NULL); // clever

    return 0;
}


Generic foo(T t) for int
Generic foo(T t) for double
Specific foo(T* t) for void * __ptr64
Last edited on
JLBorges (13770)
May be interesting:

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#include <iostream>
#include <typeinfo> // The header <typeinfo> must be included before using typeid
                    // (if the header is not included, every use of the keyword typeid makes the program ill-formed.)
                    // https://en.cppreference.com/w/cpp/language/typeid

template<typename T>
void foo(T t) {
    std::cout << "Generic foo(T t) for " << typeid(t).name() << std::endl;
}

template<typename T>
void foo(T* t) {
    std::cout << "Specific foo(T* t) for " << typeid(t).name() << std::endl;
}

int main()
{
    foo( nullptr ) ; // generic with T == std::nullptr_t
    foo( &std::type_info::name ) ; // generic with T == const char* (std::type_info::*)() const 
    // foo( std::cout ) ; // *** error ***
}
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