diff --git a/execution.html b/execution.html index d68a4c4..dd4382d 100644 --- a/execution.html +++ b/execution.html @@ -2246,7 +2246,7 @@

D2300R8
std::execution

-

Draft Proposal,

+

Draft Proposal,

Authors: @@ -7004,7 +7004,7 @@

For a subexpression c, let GET-AWAITER(c, p) be expression-equivalent to the series of transformations and conversions applied to c as the operand of an await-expression in a coroutine, -resulting in lvalue e as described by [expr.await]/3.2-4, where p is an lvalue refering to the coroutine’s promise type, P. This includes the invocation of the promise type’s await_transform member if any, the invocation of the operator co_await picked by overload resolution if any, and any necessary implicit +resulting in lvalue e as described by [expr.await]/3.2-4, where p is an lvalue referring to the coroutine’s promise type, P. This includes the invocation of the promise type’s await_transform member if any, the invocation of the operator co_await picked by overload resolution if any, and any necessary implicit conversions and materializations.

I have opened cwg#250 to give these transformations a term-of-art so we can more easily refer to it here.
@@ -7306,7 +7306,7 @@
tag_invoke(transfer_just, s, vs...), if that expression is valid. Let as be a pack of rvalue subexpressions of types decay_t<Vs>... refering to objects direct-initilized from vs. If the function +

tag_invoke(transfer_just, s, vs...), if that expression is valid. Let as be a pack of rvalue subexpressions of types decay_t<Vs>... referring to objects direct-initilized from vs. If the function selected by tag_invoke does not return a sender whose asynchronous operations execute value completion operations on an execution agent belonging to the execution resource associated with s, with value result @@ -7492,7 +7492,7 @@

on adapts an input sender into a sender that will start on an execution agent belonging to a particular scheduler’s associated execution resource.

  • -

    Let replace-scheduler(e, sch) be an expression denoting an object e' such that get_scheduler(e) returns a copy of sch, and tag_invoke(tag, e', args...) is expression-equivalent to tag(e, args...) for all arguments args... and for all tag whose type satisfies forwarding-query and is not get_scheduler_t.

    +

    Let replace-scheduler(e, sch) be an expression denoting an object e2 such that get_scheduler(e2) returns a copy of sch, and tag_invoke(tag, e2, args...) is expression-equivalent to tag(e, args...) for all arguments args... and for all tag whose type satisfies forwarding-query and is not get_scheduler_t.

  • The name on denotes a customization point object. For some subexpressions sch and s, let Sch be decltype((sch)) and S be decltype((s)). If Sch does not satisfy scheduler, or S does not satisfy sender, on is ill-formed. Otherwise, the expression on(sch, s) is expression-equivalent to:

      @@ -7532,11 +7532,11 @@
      s1 and e, where s1 is a sender returned from on or a copy of such, let S1 be decltype((s1)). -Let E' be decltype((replace-scheduler(e, sch))). +Let E2 be decltype((replace-scheduler(e, sch))). Then the type of tag_invoke(get_completion_signatures, s1, e) shall be:

      make_completion_signatures<
   copy_cvref_t<S1, S>,
-  E',
+  E2,
   make_completion_signatures<
     schedule_result_t<Sch>,
     E,
@@ -7600,10 +7600,10 @@ 
      s2. When s2 is connected with some receiver out_r, it:
      
        
        
         
      1. 
-         
        Constructs a receiver r such that when a receiver completion operation Tag(r, args...) is called, it decay-copies args... into op_state (see below) as args'... and constructs a receiver r2 such that:
        
+         
        Constructs a receiver r such that when a receiver completion operation Tag(r, args...) is called, it decay-copies args... into op_state (see below) as args2... and constructs a receiver r2 such that:
        
          
          
           
        1. 
-           
          When set_value(r2) is called, it calls Tag(out_r, std::move(args')...).
          
+           
          When set_value(r2) is called, it calls Tag(out_r, std::move(args2)...).
          
           
        2. 
            
          set_error(r2, e) is expression-equivalent to set_error(out_r, e).
          
           
        3. 
@@ -7668,68 +7668,74 @@ 
          then attaches an invocable as a continuation for an input sender’s value
 completion operation.
          
     
        4. 
-     
          The name then denotes a customization point object. For some
-subexpressions s and f, let S be decltype((s)), let F be the
-decayed type of f, and let f' be an xvalue refering to an object
-decay-copied from f. If S does not satisfy sender, or F does not model movable-value, then is
-ill-formed. Otherwise, the expression then(s, f) is
-expression-equivalent to:
          
+     
          The name then denotes a customization point object. For some subexpressions s and f, let S be decltype((s)) and let F be the decayed type of f. If S does not satisfy sender, or F does not model movable-value, then(s, f) is ill-formed. Otherwise,
+the expression then(s, f) is expression-equivalent to:
          
      
            
       
          1. 
-       
            tag_invoke(then, get_completion_scheduler<set_value_t>(get_env(s)), s, f), if that expression is valid.
            
+       
            tag_invoke(then, get_completion_scheduler<set_value_t>(get_env(s)), s, f),
+if that expression is valid.
            
        
              
         
            • 
-         
              Mandates: The type of the tag_invoke expression above satisfies sender.
              
+         
              Mandates: The type of the tag_invoke expression above
+  satisfies sender.
              
        
            
       
          2. 
        
            Otherwise, tag_invoke(then, s, f), if that expression is valid.
            
        
              
         
            • 
-         
              Mandates: The type of the tag_invoke expression above satisfies sender.
              
+         
              Mandates: The type of the tag_invoke expression above
+  satisfies sender.
              
        
            
       
          3. 
-       
            Otherwise, constructs a sender s2. When s2 is connected with some receiver out_r, it:
            
+       
            Otherwise, a sender expression out_s such that when out_s is
+   connected with some receiver out_r, it returns an operation state o containing copies of f and out_r and the result of calling connect(s2, r), where s2 is a reference to an object decay-copied
+   from s and that has the same _cv_ qualifiers and value category as out_s; and where r is a receiver as described below.
            
        
              
         
            1. 
-         
              Constructs a receiver r such that:
              
+         
              Let f2 and out_r2 be xvalues referring respectively to the copies
+  of f and out_r in o. The receiver r behaves as follows:
              
          
                
           
              1. 
-           
                When set_value(r, args...) is called, let v be the
-expression invoke(f', args...). If decltype(v) is void,
-calls set_value(out_r); otherwise, it calls set_value(out_r, v). If any of these throw an
-exception, it catches it and calls set_error(out_r, current_exception()). If any of these expressions would be
-ill-formed, the expression set_value(r, args...) is
-ill-formed.
                
+           
                When set_value(r, args...) is called, let v be the expression invoke(f2, args...). If decltype(v) is void, evaluates v and calls set_value(out_r); otherwise, it calls set_value(out_r2, v). If any of these throw an exception, the
+exception is caught and set_error(out_r2, current_exception()) is called. If any of these expressions would be ill-formed, the
+expression set_value(r, args...) is ill-formed.
                
           
              2. 
-           
                set_error(r, e) is expression-equivalent to set_error(out_r, e).
                
+           
                set_error(r, e) is expression-equivalent to set_error(out_r2, e).
                
           
              3. 
-           
                set_stopped(r) is expression-equivalent to set_stopped(out_r).
                
+           
                set_stopped(r) is expression-equivalent to set_stopped(out_r2).
                
          
              
         
            2. 
-         
              Returns an expression-equivalent to connect(s, r).
              
-        
            3. 
-         
              Let compl-sig-t<Tag, Args...> name the type Tag() if Args... is a template paramter pack containing the
-single type void; otherwise, Tag(Args...). Given
-subexpressions s2 and e where s2 is a sender returned from then or a copy of such, let S2 be decltype((s2)) and let E be decltype((e)). The type of tag_invoke(get_completion_signatures, s2, e) shall be equivalent
-to:
              
+         
              Let inner_op be a non-const lvalue referring to the operation
+  state in o. start(o) is expression-equivalent to start(inner_op).
              
+       
            
+     
          
+    
        5. 
+     
          Given subexpressions out_s and e where out_s is a sender
+returned from then(s, f) or a copy of such, let OutS be decltype((out_s)) and let E be decltype((e)). The type of tag_invoke(get_completion_signatures, out_s, e) shall be:
          
 
          make_completion_signatures<
-  copy_cvref_t<S2, S>, E, set-error-signature,
+  clone-cvref-t<OutS, S>, E, set-error-signature,
     set-value-completions>;
 
          
-         
          where set-value-completions is an alias for:
          
+     
          where set-value-completions is the alias
+template:
          
 
          template<class... As>
-  set-value-completions =
-    completion_signatures<compl-sig-t<set_value_t, invoke_result_t<F, As...>>>
+  using set-value-completions =
+    completion_signatures<SET-VALUE-SIG(invoke_result_t<F, As...>)>
 
          
-         
          and set-error-signature is an alias for completion_signatures<set_error_t(exception_ptr)> if any of the types
-in the type-list named by value_types_of_t<copy_cvref_t<S2, S>, E, potentially-throwing, type-list> are true_type; otherwise, completion_signatures<>, where potentially-throwing is the template alias:
          
+     
          and set-error-signature is an alias for completion_signatures<set_error_t(exception_ptr)> if any of the
+types in the type-list named by value_types_of_t<clone-cvref-t<OutS, S>, E, potentially-throwing, type-list> are true_type; otherwise, completion_signatures<>, where potentially-throwing is the template alias:
          
 
          template<class... As>
   using potentially-throwing =
-    bool_constant<!is_nothrow_invocable_v<F, As...>>;
+    negation<is_nothrow_invocable<F, As...>>;
 
          
-       
        
+    
      2. 
+     
        The expression then(s, f) has undefined behavior unless it returns a sender out_s that:
        
+     
          
+      
        1. 
+       
          Invokes f or a copy of such with the value result datums of s using the result value of f as out_s’s value completion, and
          
+      
        2. 
+       
          Forwards the non-value completion operations unchanged.
          
      
        
-     
        If the function selected above does not return a sender that invokes f with the value result datums of s using f’s return value as the sender’s value completion, and forwards the non-value completion operations unchanged, the behavior of calling then(s, f) is undefined.
        
    
      
    
      11.9.6.7. execution::upon_error [exec.upon.error]
      
    
        
@@ -7739,7 +7745,7 @@ 
        upon_error denotes a customization point object. For
 some subexpressions s and f, let S be decltype((s)), let F be the
-decayed type of f, and let f' be an xvalue refering to an object
+decayed type of f, and let f2 be an xvalue referring to an object
 decay-copied from f. If S does not satisfy sender, or F does not model movable-value, upon_error is
 ill-formed. Otherwise, the expression upon_error(s, f) is
 expression-equivalent to:
        
@@ -7766,7 +7772,7 @@ 
        set_value(r, args...) is expression-equivalent to set_value(out_r, args...).
        
           
      1. 
            
        When set_error(r, e) is called, let v be the
-expression invoke(f', e). If decltype(v) is void, calls set_value(out_r); otherwise, it calls set_value(out_r, v). If any of these throw an
+expression invoke(f2, e). If decltype(v) is void, calls set_value(out_r); otherwise, it calls set_value(out_r, v). If any of these throw an
 exception, it catches it and calls set_error(out_r, current_exception()). If any of these expressions would be
 ill-formed, the expression set_error(r, e) is
 ill-formed.
        
@@ -7776,7 +7782,7 @@ 
        connect(s, r).
        
         
      2. 
-         
        Let compl-sig-t<Tag, Args...> name the type Tag() if Args... is a template paramter pack containing the
+         
        Let compl-sig-t<Tag, Args...> name the type Tag() if Args... is a template parameter pack containing the
 single type void; otherwise, Tag(Args...). Given
 subexpressions s2 and e where s2 is a sender returned from upon_error or a copy of such, let S2 be decltype((s2)) and let E be decltype((e)). The type of tag_invoke(get_completion_signatures, s2, e) shall be equivalent
 to:
        
@@ -7807,7 +7813,7 @@ 
        upon_stopped denotes a customization point object. For
 some subexpressions s and f, let S be decltype((s)), let F be the
-decayed type of f, and let f' be an xvalue refering to an object
+decayed type of f, and let f2 be an xvalue referring to an object
 decay-copied from f. If S does not satisfy sender, or F does not model both movable-value and invocable, upon_stopped is ill-formed. Otherwise, the expression upon_stopped(s, f) is expression-equivalent to:
        
      
          
       
        1. 
@@ -7834,7 +7840,7 @@ 
          set_error(r, e) is expression-equivalent to set_error(out_r, e).
          
           
        2. 
            
          When set_stopped(r) is called, let v be the
-expression invoke(f'). If v has type void, calls set_value(out_r); otherwise, calls set_value(out_r, v). If any of these throw an
+expression invoke(f2). If v has type void, calls set_value(out_r); otherwise, calls set_value(out_r, v). If any of these throw an
 exception, it catches it and calls set_error(out_r, current_exception()). If any of these expressions would be
 ill-formed, the expression set_stopped(r) is
 ill-formed.
          
@@ -7842,7 +7848,7 @@ 
          connect(s, r).
          
         
        3. 
-         
          Let compl-sig-t<Tag, Args...> name the type Tag() if Args... is a template paramter pack containing the
+         
          Let compl-sig-t<Tag, Args...> name the type Tag() if Args... is a template parameter pack containing the
 single type void; otherwise, Tag(Args...). Given
 subexpressions s2 and e where s2 is a sender returned from upon_stopped or a copy of such, let S2 be decltype((s2)) and let E be decltype((e)). The type of tag_invoke(get_completion_signatures, s2, e) shall be equivalent
 to:
          
@@ -7868,7 +7874,7 @@ 
          let_value, let_error, and let_stopped denote customization point objects.
 Let the expression let-cpo be one of let_value, let_error, or let_stopped.
-For subexpressions s and f, let S be decltype((s)), let F be the decayed type of f, and let f' be an xvalue that refers to an object decay-copied from f.
+For subexpressions s and f, let S be decltype((s)), let F be the decayed type of f, and let f2 be an xvalue that refers to an object decay-copied from f.
 If S does not satisfy sender, the expression let-cpo(s, f) is ill-formed.
 If F does not satisfy invocable, the expression let_stopped(s, f) is ill-formed.
 Otherwise, the expression let-cpo(s, f) is expression-equivalent to:
          
@@ -7886,7 +7892,7 @@ 
          tag_invoke expression above satisfies sender.
          
        
       
        4. 
-       
          Otherwise, given a receiver out_r and an lvalue out_r' refering to an object decay-copied from out_r.
          
+       
          Otherwise, given a receiver out_r and an lvalue out_r' referring to an object decay-copied from out_r.
          
        
            
         
          1. 
          
            For let_value, let set-cpo be set_value.
@@ -7897,7 +7903,7 @@ 
            r be an rvalue of a receiver type R such that:
            
          
              
           
            1. 
-           
              When set-cpo(r, args...) is called, the receiver r decay-copies args... into op_state2 as args'..., then calls invoke(f', args'...), resulting in a sender s3.
+           
              When set-cpo(r, args...) is called, the receiver r decay-copies args... into op_state2 as args2..., then calls invoke(f2, args2...), resulting in a sender s3.
 It then calls connect(s3, std::move(out_r')), resulting in an operation state op_state3. op_state3 is saved as a part of op_state2.
 It then calls start(op_state3).
 If any of these throws an exception, it catches it and calls set_error(std::move(out_r'), current_exception()).
@@ -7993,7 +7999,7 @@ 
              f(i, args...) for each i of type Shape from 0 to shape where args is a pack of subexpressions refering to the value completion
+       
              If the function selected above does not return a sender that invokes f(i, args...) for each i of type Shape from 0 to shape where args is a pack of subexpressions referring to the value completion
 result datums of the input sender, or does not execute a value
 completion operation with said datums, the behavior of calling bulk(s, shape, f) is undefined.
              
      
            
@@ -9027,8 +9033,8 @@ 
            completion_signatures.
            
     
          2. 
      
            [Example:
            
-
            // Given a sender S and an environment Env, adapt S’s completion
-// signatures by lvalue-ref qualifying the values, adding an additional
+
            // Given a sender S and an environment Env, adapt the completion
+// signatures of S by lvalue-ref qualifying the values, adding an additional
 // exception_ptr error completion if its not already there, and leaving the
 // other completion signatures alone.
 template<class... Args>
diff --git a/receiver_redesign.html b/receiver_redesign.html
index a7ef5e4..12ebd00 100644
--- a/receiver_redesign.html
+++ b/receiver_redesign.html
@@ -2162,7 +2162,7 @@
   
            
    
            
    
            P2532R0
            Removing exception_ptr from the Receiver Concepts
            
-   
            Published Proposal, 
            
+   
            Published Proposal, 
            
    
            
     
            
      
            Author: