C++ Pack Sizeof

sizeof...(parameter_pack)

#include <cstddef>

template <typename... Types>
struct TypePackInfo {
    // Evaluates to the number of types in 'Types'
    static constexpr std::size_t count = sizeof...(Types); 
};

// Example instantiation: TypePackInfo<int, double, char>::count == 3

#include <cstddef>

template <typename... Args>
void evaluate_arguments(Args... args) {
    // Both expressions yield the exact same std::size_t value
    constexpr std::size_t type_count = sizeof...(Args);
    constexpr std::size_t arg_count  = sizeof...(args); 
}

#include <cstddef>

template <auto... Values>
struct ValuePackInfo {
    // Evaluates to the number of values in 'Values'
    static constexpr std::size_t count = sizeof...(Values);
};

// Example instantiation: ValuePackInfo<1, 2, 3, 4>::count == 4