[gcc r12-4855] libstdc++: Add some noexcept to std::valarray

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:4f032929ac9e549ade45c952505ef562b82d297e

commit r12-4855-g4f032929ac9e549ade45c952505ef562b82d297e
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Nov 1 19:11:47 2021 +0000

    libstdc++: Add some noexcept to std::valarray
    
    libstdc++-v3/ChangeLog:
    
            * include/std/valarray (valarray::valarray()): Add noexcept.
            (valarray::operator[]): Likewise.

Diff:
---
 libstdc++-v3/include/std/valarray | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libstdc++-v3/include/std/valarray b/libstdc++-v3/include/std/valarray
index c6242eb4db9..9c2f1be1e41 100644
--- a/libstdc++-v3/include/std/valarray
+++ b/libstdc++-v3/include/std/valarray
@@ -137,7 +137,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 	// _lib.valarray.cons_ construct/destroy:
       ///  Construct an empty array.
-      valarray();
+      valarray() _GLIBCXX_NOTHROW;
 
       ///  Construct an array with @a n elements.
       explicit valarray(size_t);
@@ -270,11 +270,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  @param  __i  Index of element to return.
        *  @return  Reference to the i'th element.
        */
-      _Tp&                operator[](size_t __i);
+      _Tp&                operator[](size_t __i) _GLIBCXX_NOTHROW;
 
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
       // 389. Const overload of valarray::operator[] returns by value.
-      const _Tp&          operator[](size_t) const;
+      const _Tp&          operator[](size_t) const _GLIBCXX_NOTHROW;
 
       // _lib.valarray.sub_ subset operations:
       /**
@@ -581,7 +581,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     inline const _Tp&
-    valarray<_Tp>::operator[](size_t __i) const
+    valarray<_Tp>::operator[](size_t __i) const _GLIBCXX_NOTHROW
     {
       __glibcxx_requires_subscript(__i);
       return _M_data[__i];
@@ -589,7 +589,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     inline _Tp&
-    valarray<_Tp>::operator[](size_t __i)
+    valarray<_Tp>::operator[](size_t __i) _GLIBCXX_NOTHROW
     {
       __glibcxx_requires_subscript(__i);
       return _M_data[__i];
@@ -618,7 +618,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     inline
-    valarray<_Tp>::valarray() : _M_size(0), _M_data(0) {}
+    valarray<_Tp>::valarray() _GLIBCXX_NOTHROW : _M_size(0), _M_data(0) {}
 
   template<typename _Tp>
     inline