On Wed, Jul 20, 2011 at 12:14 PM, Steven Watanabe <watanabesj@gmail.com>wrote:
AMDG
On 07/20/2011 05:49 AM, Fernando Pelliccioni wrote:
On Sun, May 22, 2011 at 7:18 PM, Steven Watanabe <watanabesj@gmail.com wrote:
The code is available from the Vault: http://tinyurl.com/3z9jcwp
The link is broken. I want to test your library, is there somewhere else where I can download it?
The vault no longer exists. All the existing content has been moved to github. You can get the file from: https://github.com/boost-vault/Miscellaneous
Hi Steven, I want to write something like this ... void test_iostream_concept() { typedef mpl::vector< ostreamable<>, destructible<> > requirements; typedef any< requirements, _self&> any_type; typedef std::vector<any_type> ostr_vec; ostr_vec vec; //boost iostreams io::stream<writer_1> writer1; io::stream<writer_2> writer2; io::stream<io::file_sink> file_writer; io::stream<io::null_sink> null_writer; std::ofstream f1("test.txt"); vec.push_back( any_type(writer1) ); vec.push_back( any_type(std::cout) ); vec.push_back( any_type(f1) ); ostr_vec::const_iterator it = vec.begin(); ostr_vec::const_iterator end = vec.end(); for ( ; it != end; ++it ) { std::cout << *it << std::endl; //(*it) << "hello " << "world!"; //(1) compile-time error. any_type do not support operator<< } } The line (1) do not compile because *any_type* do not has *operator<<.* I could create my *custom concept*, like this... template<class C, class T> struct bitwise_left_shift : primitive_concept<bitwise_left_shift<C, T>, void(C&, const T&)> { static void apply( C& ostr, const T& arg ) { ostr.operator<<(arg); //ostr << arg; } }; I used in this way ... it works!!! void test_custom_concept_bitwise_left_shift() { any<bitwise_left_shift<_self, *int*>, _self&> ostr( std::cout ); int i = 10; bitwise_left_shift<_self, int>()(ostr, i); } BUT!.... *ostr* object only works for *int's.* * * How do I get *ostr* works generically? * * Something like this... void test_custom_concept_bitwise_left_shift() { //pseudo-code, do not compiles any<bitwise_left_shift<_self, *T*>, _self&> ostr( std::cout ); int i = 10; bitwise_left_shift<_self, *T*>()(ostr, i); float ff = 10.98; bitwise_left_shift<_self, *T*>()(ostr, ff); } How I define *T* ? Many thanks! Fernando Pelliccioni.