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Implement P0966 - string::reserve should not shrink 

llvm-svn: 347789
This commit is contained in:
Marshall Clow 2018-11-28 18:18:34 +00:00
parent 647782c78b
commit 4d64d7dd64
3 changed files with 13 additions and 4 deletions
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4
libcxx/include/string
View File

@ -956,9 +956,11 @@ public:
void resize(size_type __n, value_type __c);
_LIBCPP_INLINE_VISIBILITY void resize(size_type __n) {resize(__n, value_type());}
void reserve(size_type __res_arg);
_LIBCPP_INLINE_VISIBILITY void __resize_default_init(size_type __n);
void reserve(size_type __res_arg = 0);
_LIBCPP_INLINE_VISIBILITY
void reserve() _NOEXCEPT {reserve(0);}
_LIBCPP_INLINE_VISIBILITY
void shrink_to_fit() _NOEXCEPT {reserve();}
_LIBCPP_INLINE_VISIBILITY

9
libcxx/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
View File

@ -9,7 +9,9 @@
// <string>
// void reserve(size_type res_arg=0);
// Split into two calls for C++20
// void reserve();
// void reserve(size_type res_arg);
#include <string>
#include <stdexcept>
@ -44,6 +46,9 @@ test(S s, typename S::size_type res_arg)
assert(s == s0);
assert(s.capacity() >= res_arg);
assert(s.capacity() >= s.size());
#if TEST_STD_VER > 17
assert(s.capacity() >= old_cap); // resize never shrinks as of P0966
#endif
}
#ifndef TEST_HAS_NO_EXCEPTIONS
else
@ -90,6 +95,7 @@ int main()
test(s, 10);
test(s, 50);
test(s, 100);
test(s, 1000);
test(s, S::npos);
}
}
@ -121,6 +127,7 @@ int main()
test(s, 10);
test(s, 50);
test(s, 100);
test(s, 1000);
test(s, S::npos);
}
}

4
libcxx/www/cxx2a_status.html
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@ -80,7 +80,7 @@
<tr><td><a href="https://wg21.link/P0809R0">P0809R0</a></td><td>LWG</td><td>Comparing Unordered Containers</td><td>Jacksonville</td><td></td><td></td></tr>
<tr><td><a href="https://wg21.link/P0858R0">P0858R0</a></td><td>LWG</td><td>Constexpr iterator requirements</td><td>Jacksonville</td><td></td><td></td></tr>
<tr><td><a href="https://wg21.link/P0905R1">P0905R1</a></td><td>CWG</td><td>Symmetry for spaceship</td><td>Jacksonville</td><td></td><td></td></tr>
<tr><td><a href="https://wg21.link/P0966R1">P0966R1</a></td><td>LWG</td><td><tt>string::reserve</tt> Should Not Shrink</td><td>Jacksonville</td><td></td><td></td></tr>
<tr><td><a href="https://wg21.link/P0966R1">P0966R1</a></td><td>LWG</td><td><tt>string::reserve</tt> Should Not Shrink</td><td>Jacksonville</td><td>Complete</td><td>8.0</td></tr>
<tr><td></td><td></td><td></td><td></td><td></td><td></td></tr>
<tr><td><a href="https://wg21.link/P0019R8">P0019R8</a></td><td>LWG</td><td>Atomic Ref</td><td>Rapperswil</td><td></td><td></td></tr>
@ -291,7 +291,7 @@
<!-- <tr><td></td><td></td><td></td><td></td></tr> -->
</table>
<p>Last Updated: 27-Nov-2018</p>
<p>Last Updated: 28-Nov-2018</p>
</div>
</body>
</html>