Safe C++

Appendix D. Source Code for the file scpp_array.hpp

#ifndef __SCPP_ARRAY_HPP_INCLUDED__
#define __SCPP_ARRAY_HPP_INCLUDED__

#include "scpp_assert.hpp"

namespace scpp {

// Fixed-size array
template <typename T, unsigned N>
class array {
 public:
  typedef unsigned size_type;

  // Most commonly used constructors:
  array() {}
  explicit array(const T& initial_value) {
    for(size_type i=0; i<size(); ++i)
      data_[i] = initial_value;
  }

  size_type size() const { return N; }

  // Note: we do not provide a copy-ctor and assignment operator.
  // we rely on default versions of these methods generated by the compiler.

  T& operator [] (size_type index) {
    SCPP_TEST_ASSERT(index < N,
      "Index " << index << " must be less than " << N);
    return data_[index];
  }

  const T& operator [] (size_type index) const {
    SCPP_TEST_ASSERT(index < N,
      "Index " << index << " must be less than " << N);
    return data_[index];
  }

  // Accessors
  T* begin() { return &data_[0]; }
  const T* begin() const { return &data_[0]; }

  // Returns pointer PAST the end of the array.
  T* end() { return &data_[N]; }
  const T* end() const { return &data_[N]; }

  private:
  T data_[N];
};
} // namespace scpp


template <typename T, unsigned N>
inline
std::ostream& operator << (std::ostream& os, const scpp::array<T,N>& a) {
  for( unsigned i=0; i<a.size(); ++i ) {
    os << a[i];
    if( i + 1 < a.size() )
        os << " ";
  }
  return os;
}

#endif // __SCPP_ARRAY_HPP_INCLUDED__