Re: [Boost-users] [filesystem] basic_path as parameter

Subject: Re: [Boost-users] [filesystem] basic_path as parameter
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2010-03-09 12:38:32

AMDG

Alex Lamaison wrote:
> I'd like to use basic_path as a function parameter so that it works 
> correctly whether a wide or narrow string is passed.  
>
> template<typename T>
> void func(basic_path<T> file) { do thing to file }
>
> func("myfile");
> func(L"myfile");
>
> However I can't do this because basic_path has a second Traits template 
> parameter which is not itself a template.  So I tried the following 
> workaround:
>
> template<typename T> struct traits_chooser;
>
> template<> struct traits_chooser<char*>
> {
>     typedef boost::filesystem::path_traits traits;
> };
>
> template<> struct traits_chooser<wchar_t*>
> {
>     typedef boost::filesystem::wpath_traits traits;
> };
>
> template<typename T>
> void func(basic_path<T, typename traits_chooser<T>::traits> file) {...}
>
> But my compiler (MSVC 2005) still can't deduce the parameter type.  Does 
> anyone know how I can get this to work?
>   

Try specializing for char and wchar_t instead of char* and wchar_t*.
You could also just use

template<typename T, typename Traits>
void func(const basic_bath<T, Traits>& file);

In Christ,
Steven Watanabe