MPL 2-1, C++ (clang)

MPL 2-1

//clang 3.8.0

/*
2-1. Write a ternary metafunction replace_type<c,x,y> that takes an arbitrary compound type c as its first parameter, and replaces all occurrences of a type x within c with y:

typedef replace_type< void*, void, int >::type t1; // int*

typedef replace_type<         
    int const*[10]       
    ,int const       
    , long     
>::type t2; // long* [10]

typedef replace_type<
    char& (*)(char&)       , 
    char&       , 
    long&     
>::type t3; // long& (*)(long&)

You can limit the function types you operate on to those with fewer than two arguments.

#include <iostream>
#include <deque>
#include <string>
#include <map>
#include <unordered_map>
#include <vector>
#include <algorithm>
#include <memory>
#include <iterator>
#include <stack>
#include <set>

using namespace std;
#include <boost/type_traits.hpp>
#include <boost/mpl/if.hpp>

#include <type_traits>
#include <typeinfo>
#ifndef _MSC_VER
#   include <cxxabi.h>
#endif
#include <memory>
#include <string>
#include <cstdlib>

namespace
{

template <class T>
std::string
type_name()
{
    typedef typename std::remove_reference<T>::type TR;
    std::unique_ptr<char, void(*)(void*)> own
           (
#ifndef _MSC_VER
                abi::__cxa_demangle(typeid(TR).name(), nullptr,
                                           nullptr, nullptr),
#else
                nullptr,
#endif
                std::free
           );
    std::string r = own != nullptr ? own.get() : typeid(TR).name();
    if (std::is_const<TR>::value)
        r += " const";
    if (std::is_volatile<TR>::value)
        r += " volatile";
    if (std::is_lvalue_reference<T>::value)
        r += "&";
    else if (std::is_rvalue_reference<T>::value)
        r += "&&";
    return r;
}
} // just for printing

// ternary
template <typename C, typename X, typename Y>
struct
{
    // stupid msg
};

int main()
{

}


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