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array.h
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94 lines (74 loc) · 1.35 KB
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/* -*- mode: c++; c-basic-offset: 4 -*- */
/* Utilities to create scalars and empty arrays that behave like the
Numpy array wrappers in numpy_cpp.h */
#ifndef MPL_SCALAR_H
#define MPL_SCALAR_H
#include <cstddef>
#include <stdexcept>
namespace array
{
template <typename T, int ND>
class scalar
{
public:
T m_value;
scalar(const T value) : m_value(value)
{
}
T &operator()(int i, int j = 0, int k = 0)
{
return m_value;
}
const T &operator()(int i, int j = 0, int k = 0) const
{
return m_value;
}
int shape(size_t i)
{
return 1;
}
size_t size()
{
return 1;
}
};
template <typename T, int ND>
size_t
safe_first_shape(scalar<T, ND>)
{
return 1;
}
template <typename T>
class empty
{
public:
typedef empty<T> sub_t;
empty() = default;
T &operator()(int i, int j = 0, int k = 0)
{
throw std::runtime_error("Accessed empty array");
}
const T &operator()(int i, int j = 0, int k = 0) const
{
throw std::runtime_error("Accessed empty array");
}
sub_t operator[](int i) const
{
return empty<T>();
}
int shape(size_t i) const
{
return 0;
}
size_t size() const
{
return 0;
}
};
template <typename T>
size_t safe_first_shape(empty<T>)
{
return 0;
}
}
#endif