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Create new method bitset::to_integer #4

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Create new method bitset::to_integer #4

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31 changes: 31 additions & 0 deletions libstdc++-v3/include/std/bitset
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Original file line number Diff line number Diff line change
Expand Up @@ -242,6 +242,30 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
_GLIBCXX14_CONSTEXPR unsigned long long
_M_do_to_ullong() const;
#endif
#if __cplusplus >= 201103L
template<typename _T>
_GLIBCXX14_CONSTEXPR _T
_M_do_to_integer() const {
static_assert(std::is_integral<_T>::value && N <= sizeof(_T) * __CHAR_BIT__);
size_t size_in_words = sizeof(_T) / __SIZEOF_LONG__;
size_t left_in_bytes = sizeof(_T) % __SIZEOF_LONG__;
if (std::numeric_limits<_T>::max() <= _M_w[size_in_words]) {
__throw_overflow_error(__N("_Base_bitset::_M_do_to_integer"));
return;
}
for (size_t __i = size_in_words + (left_in_bytes != 0) ; __i < _Nw ; ++__i) {
if (words[__i]) {
__throw_overflow_error(__N("_Base_bitset::_M_do_to_integer"));
return;
}
}
_T ret = 0;
for(size_t __i = 0 ; __i < size_in_words + (left_in_bytes != 0) ; ++__i) {
ret += static_cast<_T>(_Nw[__i]) << (__CHAR_BIT__ * __i);
}
return ret;
}
#endif

// find first "on" bit
_GLIBCXX14_CONSTEXPR size_t
Expand Down Expand Up @@ -1270,6 +1294,13 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
to_ullong() const
{ return this->_M_do_to_ullong(); }
#endif
#if __cplusplus >= 201103L
template <typename _T>
_GLIBCXX23_CONSTEXPR
_T
to_integer() const
{ return this->_M_do_to_integer<_T>(); }
#endif

#if _GLIBCXX_HOSTED
/**
Expand Down