I love C++! :D
#include <iostream>
#include <type_traits>
/**
* @brief Generic meta-combinator for layered template evaluation.
*
* Combines two template-level value providers (A and B) to enable
* multi-phase compile-time composition.
*/
template<template<typename> class A, template<typename> class B, typename T>
struct Combine {
using type = typename B<T>::type;
static constexpr auto value = A<T>::value + B<T>::value;
};
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