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105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
//
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// checked_result.hpp
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// SafeIntegers
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//
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// Created by Robert Ramey on 2/26/15.
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//
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//
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#ifndef BOOST_NUMERIC_CHECKED_CHECKED_RESULT
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#define BOOST_NUMERIC_CHECKED_CHECKED_RESULT
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#include <ostream>
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#include "policies.hpp"
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namespace boost {
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namespace numeric {
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template<typename R>
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struct checked_result {
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// poor man's variant which supports SAFE_NUMERIC_CONSTEXPR
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enum class exception_type {
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no_exception,
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overflow_error,
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underflow_error,
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range_error
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};
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exception_type m_e;
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union {
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R m_r;
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const char * m_msg;
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};
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// constructors
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SAFE_NUMERIC_CONSTEXPR explicit checked_result(const R & r) :
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m_e(exception_type::no_exception),
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m_r(r)
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{}
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SAFE_NUMERIC_CONSTEXPR explicit checked_result(exception_type e, const char * msg) :
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m_e(e),
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m_msg(msg)
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{}
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// copy constructor
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/*
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SAFE_NUMERIC_CONSTEXPR checked_result(checked_result && r) :
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m_e(r.m_e),
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m_r(r.m_r)
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{}
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SAFE_NUMERIC_CONSTEXPR checked_result(const checked_result & r) :
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m_e(r.m_e),
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m_r(r.m_r)
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{}
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*/
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// accesors
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SAFE_NUMERIC_CONSTEXPR operator R() const {
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return m_r;
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}
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SAFE_NUMERIC_CONSTEXPR operator exception_type() const {
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return m_e;
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}
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SAFE_NUMERIC_CONSTEXPR operator const char *() const {
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return m_msg;
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}
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SAFE_NUMERIC_CONSTEXPR bool operator==(const exception_type & et) const {
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return m_e == et;
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}
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SAFE_NUMERIC_CONSTEXPR bool operator!=(const exception_type & et) const {
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return m_e != et;
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}
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template<class EP>
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void
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dispatch() const {
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BOOST_CONCEPT_ASSERT((ExceptionPolicy<EP>));
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switch(m_e){
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case exception_type::overflow_error:
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EP::overflow_error(m_msg);
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break;
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case checked_result<R>::exception_type::underflow_error:
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EP::underflow_error(m_msg);
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break;
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case checked_result<R>::exception_type::range_error:
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EP::range_error(m_msg);
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break;
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case checked_result<R>::exception_type::no_exception:
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break;
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default:
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break;
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}
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}
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};
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} // numeric
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} // boost
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template<typename R>
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std::ostream & operator<<(std::ostream & os, const boost::numeric::checked_result<R> & r){
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if(r == boost::numeric::checked_result<R>::exception_type::no_exception)
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os << static_cast<R>(r);
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else
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os << static_cast<const char *>(r);
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return os;
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}
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#endif // BOOST_NUMERIC_CHECKED_CHECKED_RESULT
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