[atomics.types.int,atomics.types.float] Excise uses of undeclared 'T'

Fixes NB US 196-315 (C++26 CD).

Author: jensmaurer

source/threads.tex

@@ -5238,8 +5238,8 @@
 \indexlibrarymember{fetch_sub}{atomic<\placeholder{integral-type}>}%
 \indexlibrarymember{fetch_xor}{atomic<\placeholder{integral-type}>}%
 \begin{itemdecl}
-T fetch_@\placeholdernc{key}@(T operand, memory_order order = memory_order::seq_cst) volatile noexcept;
-constexpr T fetch_@\placeholdernc{key}@(T operand, memory_order order = memory_order::seq_cst) noexcept;
+\placeholder{integral-type} fetch_@\placeholdernc{key}@(\placeholder{integral-type} operand, memory_order order = memory_order::seq_cst) volatile noexcept;
+constexpr \placeholder{integral-type} fetch_@\placeholdernc{key}@(\placeholder{integral-type} operand, memory_order order = memory_order::seq_cst) noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -5342,7 +5342,6 @@
 with the value pointed to by \tcode{this} and the first parameter as the arguments.
 \end{itemdescr}
 
-
 \indexlibrarymember{operator+=}{atomic<T*>}%
 \indexlibrarymember{operator-=}{atomic<T*>}%
 \indexlibrarymember{operator+=}{atomic<\placeholder{integral-type}>}%
@@ -5351,8 +5350,8 @@
 \indexlibrarymember{operator"|=}{atomic<\placeholder{integral-type}>}%
 \indexlibrarymember{operator\caret=}{atomic<\placeholder{integral-type}>}%
 \begin{itemdecl}
-T operator @\placeholder{op}@=(T operand) volatile noexcept;
-constexpr T operator @\placeholder{op}@=(T operand) noexcept;
+\placeholder{integral-type} operator @\placeholder{op}@=(\placeholder{integral-type} operand) volatile noexcept;
+constexpr \placeholder{integral-type} operator @\placeholder{op}@=(\placeholder{integral-type} operand) noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -5539,8 +5538,8 @@
 \indexlibrarymember{fetch_max}{atomic<\placeholder{floating-point-type}>}%
 \indexlibrarymember{fetch_min}{atomic<\placeholder{floating-point-type}>}%
 \begin{itemdecl}
-T fetch_@\placeholdernc{key}@(T operand, memory_order order = memory_order::seq_cst) volatile noexcept;
-constexpr T fetch_@\placeholdernc{key}@(T operand, memory_order order = memory_order::seq_cst) noexcept;
+\placeholder{floating-point-type} fetch_@\placeholdernc{key}@(\placeholder{floating-point-type} operand, memory_order order = memory_order::seq_cst) volatile noexcept;
+constexpr \placeholder{floating-point-type} fetch_@\placeholdernc{key}@(\placeholder{floating-point-type} operand, memory_order order = memory_order::seq_cst) noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -5710,8 +5709,8 @@
 \indexlibrarymember{operator+=}{atomic<\placeholder{floating-point-type}>}%
 \indexlibrarymember{operator-=}{atomic<\placeholder{floating-point-type}>}%
 \begin{itemdecl}
-T operator @\placeholder{op}@=(T operand) volatile noexcept;
-constexpr T operator @\placeholder{op}@=(T operand) noexcept;
+\placeholder{floating-point-type} operator @\placeholder{op}@=(\placeholder{floating-point-type} operand) volatile noexcept;
+constexpr \placeholder{floating-point-type} operator @\placeholder{op}@=(\placeholder{floating-point-type} operand) noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}