config.h

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#pragma once
 
#ifndef ALFI_DEFAULT_NUMBER
#define ALFI_DEFAULT_NUMBER double
#endif
 
#ifndef ALFI_DEFAULT_CONTAINER
#include <vector>
#define ALFI_DEFAULT_CONTAINER std::vector
#endif
 
#ifndef ALFI_SIZE_TYPE
#define ALFI_SIZE_TYPE size_t
#endif
 
namespace alfi {
    using DefaultNumber = ALFI_DEFAULT_NUMBER;
 
    template <typename Number = DefaultNumber>
    using DefaultContainer = ALFI_DEFAULT_CONTAINER<Number>;
 
    using SizeT = ALFI_SIZE_TYPE;
 
    namespace traits {
        template <typename T, typename = void>
        struct has_size : std::false_type {};
        template <typename T>
        struct has_size<T, std::void_t<decltype(std::declval<T>().size())>> : std::true_type {};
    }
}