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Refactor std::basic_string_view members and add noexcept

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* include/bits/string_view.tcc (find_first_of, find_last_of)
	(find_first_not_of, find_last_not_of): Add noexcept.
	* include/std/string_view (basic_string_view(const _CharT*))
	(basic_string_view(const _CharT*, size_type))
	(front, back, remove_prefix, remove_suffix, find, rfind)
	(find_first_of, find_first_not_of): Add noexcept.
	(at(size_type), _S_compare(size_type, size_type)): Replace conditional
	expressions with if statements.
	(copy(_CharT*, size_type, size_type), substr(size_type, size_type)):
	Use _M_check for length checks.
	(compare(basic_string_view)): Reformat.
	(_M_check(size_type, const char)): Add noexcept(false).
	(_M_limit(size_type, size_type)): Use noexcept not _GLIBCXX_NOEXCEPT.

From-SVN: r254044
This commit is contained in:
Jonathan Wakely 2017-10-24 14:18:52 +01:00 committed by Jonathan Wakely
parent c58a9f350a
commit 02e2a7d8ef
3 changed files with 61 additions and 52 deletions
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14
libstdc++-v3/ChangeLog
View File

@ -1,5 +1,19 @@
2017-10-24 Jonathan Wakely <jwakely@redhat.com>
* include/bits/string_view.tcc (find_first_of, find_last_of)
(find_first_not_of, find_last_not_of): Add noexcept.
* include/std/string_view (basic_string_view(const _CharT*))
(basic_string_view(const _CharT*, size_type))
(front, back, remove_prefix, remove_suffix, find, rfind)
(find_first_of, find_first_not_of): Add noexcept.
(at(size_type), _S_compare(size_type, size_type)): Replace conditional
expressions with if statements.
(copy(_CharT*, size_type, size_type), substr(size_type, size_type)):
Use _M_check for length checks.
(compare(basic_string_view)): Reformat.
(_M_check(size_type, const char)): Add noexcept(false).
(_M_limit(size_type, size_type)): Use noexcept not _GLIBCXX_NOEXCEPT.
PR libstdc++/82685
* include/experimental/string_view (operator""sv): Add noexcept.
* include/std/string_view (operator""sv): Likewise.

12
libstdc++-v3/include/bits/string_view.tcc
View File

@ -119,7 +119,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_first_of(const _CharT* __str, size_type __pos, size_type __n) const
find_first_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
for (; __n && __pos < this->_M_len; ++__pos)
@ -135,7 +136,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_last_of(const _CharT* __str, size_type __pos, size_type __n) const
find_last_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
size_type __size = this->size();
@ -156,7 +158,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_first_not_of(const _CharT* __str, size_type __pos, size_type __n) const
find_first_not_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
for (; __pos < this->_M_len; ++__pos)
@ -179,7 +182,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
constexpr typename basic_string_view<_CharT, _Traits>::size_type
basic_string_view<_CharT, _Traits>::
find_last_not_of(const _CharT* __str, size_type __pos, size_type __n) const
find_last_not_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept
{
__glibcxx_requires_string_len(__str, __n);
size_type __size = this->_M_len;

87
libstdc++-v3/include/std/string_view
View File

@ -96,14 +96,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr basic_string_view(const basic_string_view&) noexcept = default;
constexpr basic_string_view(const _CharT* __str)
constexpr basic_string_view(const _CharT* __str) noexcept
: _M_len{__str == nullptr ? 0 : traits_type::length(__str)},
_M_str{__str}
{ }
constexpr basic_string_view(const _CharT* __str, size_type __len)
: _M_len{__len},
_M_str{__str}
constexpr
basic_string_view(const _CharT* __str, size_type __len) noexcept
: _M_len{__len}, _M_str{__str}
{ }
constexpr basic_string_view&
@ -177,17 +177,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr const _CharT&
at(size_type __pos) const
{
return __pos < this->_M_len
? *(this->_M_str + __pos)
: (__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
"(which is %zu) >= this->size() "
"(which is %zu)"),
__pos, this->size()),
*this->_M_str);
if (__pos >= _M_len)
__throw_out_of_range_fmt(__N("basic_string_view::at: __pos "
"(which is %zu) >= this->size() "
"(which is %zu)"), __pos, this->size());
return *(this->_M_str + __pos);
}
constexpr const _CharT&
front() const
front() const noexcept
{
// TODO: Assert to restore in a way compatible with the constexpr.
// __glibcxx_assert(this->_M_len > 0);
@ -195,7 +193,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
constexpr const _CharT&
back() const
back() const noexcept
{
// TODO: Assert to restore in a way compatible with the constexpr.
// __glibcxx_assert(this->_M_len > 0);
@ -209,7 +207,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// [string.view.modifiers], modifiers:
constexpr void
remove_prefix(size_type __n)
remove_prefix(size_type __n) noexcept
{
__glibcxx_assert(this->_M_len >= __n);
this->_M_str += __n;
@ -217,7 +215,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
constexpr void
remove_suffix(size_type __n)
remove_suffix(size_type __n) noexcept
{ this->_M_len -= __n; }
constexpr void
@ -235,38 +233,27 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
copy(_CharT* __str, size_type __n, size_type __pos = 0) const
{
__glibcxx_requires_string_len(__str, __n);
if (__pos > this->_M_len)
__throw_out_of_range_fmt(__N("basic_string_view::copy: __pos "
"(which is %zu) > this->size() "
"(which is %zu)"),
__pos, this->size());
size_type __rlen{std::min(__n, size_type{this->_M_len - __pos})};
__pos = _M_check(__pos, "basic_string_view::copy");
const size_type __rlen = std::min(__n, _M_len - __pos);
for (auto __begin = this->_M_str + __pos,
__end = __begin + __rlen; __begin != __end;)
*__str++ = *__begin++;
return __rlen;
}
// [string.view.ops], string operations:
constexpr basic_string_view
substr(size_type __pos, size_type __n=npos) const
substr(size_type __pos, size_type __n = npos) const noexcept(false)
{
return __pos <= this->_M_len
? basic_string_view{this->_M_str + __pos,
std::min(__n, size_type{this->_M_len - __pos})}
: (__throw_out_of_range_fmt(__N("basic_string_view::substr: __pos "
"(which is %zu) > this->size() "
"(which is %zu)"),
__pos, this->size()), basic_string_view{});
__pos = _M_check(__pos, "basic_string_view::substr");
const size_type __rlen = std::min(__n, _M_len - __pos);
return basic_string_view{_M_str + __pos, __rlen};
}
constexpr int
compare(basic_string_view __str) const noexcept
{
int __ret = traits_type::compare(this->_M_str, __str._M_str,
std::min(this->_M_len, __str._M_len));
const size_type __rlen = std::min(this->_M_len, __str._M_len);
int __ret = traits_type::compare(this->_M_str, __str._M_str, __rlen);
if (__ret == 0)
__ret = _S_compare(this->_M_len, __str._M_len);
return __ret;
@ -279,7 +266,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr int
compare(size_type __pos1, size_type __n1,
basic_string_view __str, size_type __pos2, size_type __n2) const
{ return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); }
{
return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2));
}
constexpr int
compare(const _CharT* __str) const noexcept
@ -291,7 +280,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr int
compare(size_type __pos1, size_type __n1,
const _CharT* __str, size_type __n2) const
const _CharT* __str, size_type __n2) const noexcept(false)
{
return this->substr(__pos1, __n1)
.compare(basic_string_view(__str, __n2));
@ -302,13 +291,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return this->find(__str._M_str, __pos, __str._M_len); }
constexpr size_type
find(_CharT __c, size_type __pos=0) const noexcept;
find(_CharT __c, size_type __pos = 0) const noexcept;
constexpr size_type
find(const _CharT* __str, size_type __pos, size_type __n) const noexcept;
constexpr size_type
find(const _CharT* __str, size_type __pos=0) const noexcept
find(const _CharT* __str, size_type __pos = 0) const noexcept
{ return this->find(__str, __pos, traits_type::length(__str)); }
constexpr size_type
@ -350,7 +339,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return this->rfind(__c, __pos); }
constexpr size_type
find_last_of(const _CharT* __str, size_type __pos, size_type __n) const;
find_last_of(const _CharT* __str, size_type __pos,
size_type __n) const noexcept;
constexpr size_type
find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept
@ -366,7 +356,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr size_type
find_first_not_of(const _CharT* __str,
size_type __pos, size_type __n) const;
size_type __pos, size_type __n) const noexcept;
constexpr size_type
find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept
@ -385,7 +375,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr size_type
find_last_not_of(const _CharT* __str,
size_type __pos, size_type __n) const;
size_type __pos, size_type __n) const noexcept;
constexpr size_type
find_last_not_of(const _CharT* __str,
@ -396,7 +386,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
constexpr size_type
_M_check(size_type __pos, const char* __s) const
_M_check(size_type __pos, const char* __s) const noexcept(false)
{
if (__pos > this->size())
__throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
@ -407,7 +397,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// NB: _M_limit doesn't check for a bad __pos value.
constexpr size_type
_M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT
_M_limit(size_type __pos, size_type __off) const noexcept
{
const bool __testoff = __off < this->size() - __pos;
return __testoff ? __off : this->size() - __pos;
@ -418,11 +408,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static constexpr int
_S_compare(size_type __n1, size_type __n2) noexcept
{
return difference_type{__n1 - __n2} > std::numeric_limits<int>::max()
? std::numeric_limits<int>::max()
: difference_type{__n1 - __n2} < std::numeric_limits<int>::min()
? std::numeric_limits<int>::min()
: static_cast<int>(difference_type{__n1 - __n2});
const difference_type __diff{__n1 - __n2};
if (__diff > std::numeric_limits<int>::max())
return std::numeric_limits<int>::max();
if (__diff < std::numeric_limits<int>::min())
return std::numeric_limits<int>::min();
return static_cast<int>(__diff);
}
size_t _M_len;