has_data.hpp

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#ifndef TATAMI_HAS_DATA_HPP
#define TATAMI_HAS_DATA_HPP
 
#include <utility>
#include <type_traits>
 
namespace tatami {
 
template<typename Type_, class Container_, typename = int>
struct has_data {
    static const bool value = false;
};
 
template<typename Type_, class Container_>
struct has_data<Type_, Container_, decltype((void) std::declval<Container_>().data(), 0)> { 
    typedef decltype(std::declval<Container_>().data()) DataResult;
    static const bool value = std::is_same<Type_*, DataResult>::value || std::is_same<const Type_*, DataResult>::value;
};
 
}
 
#endif