size_gt.hpp

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#ifndef EAGINE_VALID_IF_SIZE_GT_HPP
#define EAGINE_VALID_IF_SIZE_GT_HPP
 
#include "in_class.hpp"
 
namespace eagine {
 
template <typename C, typename T>
struct valid_if_size_gt_policy {
 
    auto operator()(const C& c, T s) const {
        return c.size() > s;
    }
 
    struct do_log {
        template <typename X, typename = disable_if_same_t<X, do_log>>
        constexpr do_log(X&&) noexcept {}
 
        template <typename Log>
        void operator()(Log& log, const C& c, const T& s) const {
            log << "Size " << c.size() << ", "
                << "not greater than value " << s << " is invalid";
        }
    };
};
 
template <typename C, typename T>
using valid_if_size_gt = in_class_valid_if<C, T, valid_if_size_gt_policy<C, T>>;
 
} // namespace eagine
 
#endif // EAGINE_VALID_IF_SIZE_GT_HPP