[libc++] [LWG3201] Update status page: lerp should be marked noexcept.

[curdeius]

Summary

Update status page and test synopsis.

[curdeius]

I have a small doubt. Should <cmath> include lerp in its synopsis? It's currently missing. I can add it in this patch if needed.

[ldionne]

In D80456#2051547, @curdeius wrote:

I have a small doubt. Should <cmath> include lerp in its synopsis? It's currently missing. I can add it in this patch if needed.

Please add it, I think it was just forgotten when lerp was added.

Feel free to commit with that fix.

libcxx/include/cmath

 floating_point tgamma (arithmetic x);
 float          tgammaf(float x);
 long double    tgammal(long double x);
 
 floating_point trunc (arithmetic x);
 float          truncf(float x);
 long double    truncl(long double x);
 
+constexpr float       lerp(float a, float b, float t) noexcept;                   // C++20
+constexpr double      lerp(double a, double b, double t) noexcept;                // C++20
+constexpr long double lerp(long double a, long double b, long double t) noexcept; // C++20
+
 }  // std
 
 */
 
 #include <__config>
 #include <math.h>
 #include <version>
 #include <type_traits>

libcxx/test/std/numerics/c.math/c.math.lerp/c.math.lerp.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
 // <cmath>
 
-// constexpr float lerp(float a, float b, float t);
-// constexpr double lerp(double a, double b, double t);
-// constexpr long double lerp(long double a, long double b, long double t);
-
+// constexpr float lerp(float a, float b, float t) noexcept;
+// constexpr double lerp(double a, double b, double t) noexcept;
+// constexpr long double lerp(long double a, long double b, long double t) noexcept;
 
 #include <cmath>
 #include <limits>
 #include <type_traits>
 #include <cassert>
 
 #include "test_macros.h"
 #include "fp_compare.h"

libcxx/www/cxx2a_status.html

-->
   <tr><td><a href="https://wg21.link/LWG2859">2859</a></td><td>Definition of <em>reachable</em> in [ptr.launder] misses pointer arithmetic from pointer-interconvertible object</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3018">3018</a></td><td><tt>shared_ptr</tt> of function type</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3050">3050</a></td><td>Conversion specification problem in <tt>chrono::duration</tt> constructor</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3141">3141</a></td><td><tt>CopyConstructible</tt> doesn't preserve source values</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3150">3150</a></td><td><tt>UniformRandomBitGenerator</tt> should validate <tt>min</tt> and <tt>max</tt></td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3175">3175</a></td><td>The <tt>CommonReference</tt> requirement of concept <tt>SwappableWith</tt> is not satisfied in the example</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3194">3194</a></td><td><tt>ConvertibleTo</tt> prose does not match code</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3200">3200</a></td><td><tt>midpoint</tt> should not constrain <tt>T</tt> is complete</td><td>Prague</td><td></td></tr>
-  <tr><td><a href="https://wg21.link/LWG3201">3201</a></td><td><tt>lerp</tt> should be marked as <tt>noexcept</tt></td><td>Prague</td><td></td></tr>
+  <tr><td><a href="https://wg21.link/LWG3201">3201</a></td><td><tt>lerp</tt> should be marked as <tt>noexcept</tt></td><td>Prague</td><td>Complete</td></tr>
   <tr><td><a href="https://wg21.link/LWG3226">3226</a></td><td><tt>zoned_time</tt> constructor from <tt>string_view</tt> should accept <tt>zoned_time&lt;Duration2, TimeZonePtr2&gt;</tt></td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3233">3233</a></td><td>Broken requirements for <tt>shared_ptr</tt> converting constructors</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3237">3237</a></td><td>LWG 3038 and 3190 have inconsistent PRs</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3238">3238</a></td><td>Insufficiently-defined behavior of <tt>std::function</tt> deduction guides</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3242">3242</a></td><td><tt>std::format</tt>: missing rules for <tt>arg-id</tt> in <tt>width</tt> and <tt>precision</tt></td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3243">3243</a></td><td><tt>std::format</tt> and negative zeroes</td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3247">3247</a></td><td><tt>ranges::iter_move</tt> should perform ADL-only lookup of <tt>iter_move</tt></td><td>Prague</td><td></td></tr>
   <tr><td><a href="https://wg21.link/LWG3248">3248</a></td><td><tt>std::format</tt> <tt>#b</tt>, <tt>#B</tt>, <tt>#o</tt>, <tt>#x</tt>, and <tt>#X</tt>  presentation types misformat negative numbers</td><td>Prague</td><td></td></tr>