use variadic template to fill string with parameters

debug_variadic_template.cpp

#include <string>
#include <iostream>
#include <sstream>

std::wstring Anchor( int i )
{
    std::wstringstream stream;
    stream << i;

    std::wstring str = L"{";
    str += stream.str() + L"}";

    return str;
}

std::wstring Replace( std::wstring fmtstr, size_t index, const std::wstring& s )
{
    size_t pos = 0;
    std::wstring anchor = Anchor( index );

    while( std::wstring::npos != pos )
    {
        pos = fmtstr.find( anchor, pos );

        if( std::wstring::npos != pos )
        {
            fmtstr.erase( pos, anchor.size() );
            fmtstr.insert( pos, s );
            pos += s.size();
        }
    }

    return fmtstr;
}

std::wstring Format( std::wstring fmt, size_t index )
{
    return fmt;
}

template<typename T, typename... Args>
std::wstring Format( std::wstring fmt, size_t index, T& t, Args&... args )
{
    std::wstringstream stream;
    stream << t;

    std::wstring result = Replace( fmt, index, stream.str() );

    ++index;

    std::wstring str = Format( result, index, args... );

    return str;
}

template<typename... Args>
void DebugPrint(std::wstring s, Args... args)
{
    std::wstring str = Format(s, 0, args...);

    std::wcout<<str<<std::endl;
}

int main()
{
    DebugPrint(L"{1} {0}", true, L"Jérôme");
    return 0;
}