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/**
\file opt_traits.hpp
\brief some trait class
\author Junhua Gu
*/
#ifndef OPT_TRAITS
#define OPT_TRAITS
#define OPT_HEADER
#include <cstddef>
namespace opt_utilities
{
/**
Get the size of an array object
\param x the array object
\return the size of the array object
*/
template <typename T>
inline size_t get_size(const T& x)
{
return x.size();
}
/**
\brief Trait class, in which the types of elements in an array are defined
\tparam the type of the array object
*/
template <typename T>
class element_type_trait
{
public:
/**
Default definition of element_type
*/
typedef typename T::value_type element_type;
};
/**
\brief The return type trait of some certain data types.
*/
template <typename T>
class return_type_trait
{
public:
typedef T value_type;
typedef T& reference_type;
typedef const T& const_reference_type;
};
/**
Help function to get the i-th element from an array
\tparam T the type of the array object
\param x the array object
\param i the order of the element
\return the fetched element value, const reference
*/
template <typename T>
inline typename
return_type_trait<typename element_type_trait<T>::element_type>::
const_reference_type get_element(const T& x,size_t i)
{
return x[i];
}
/**
set ths i-th element by a given value
\tparam T the type of the array object
\tparam Tx the type of the element
\param x the array object
\param i the order of the element
\param v the value of the element to be set
*/
template<typename T,typename TX>
inline void set_element(T& x,size_t i,
const TX& v)
{
x[i]=v;
}
/**
resize an array object
\tparam T the type of the array
\param x the array object
\param s the new size
*/
template <typename T>
inline void resize(T& x,size_t s)
{
x.resize(s);
}
/**
Assignment operator of two array objects
\tparam Tl the type of left-hand array
\tparam Tr the type of right-hand array
\param lhs the left-hand array
\param rhs the right-hand array
\return the reference of the left-hand array
*/
template <typename Tl,typename Tr>
inline Tl& opt_eq(Tl& lhs,const Tr& rhs)
{
return (lhs=rhs);
}
}
#endif
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