1 //===--- SemaLambda.h - Lambda Helper Functions --------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file provides some common utility functions for processing
11 /// Lambdas.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_CLANG_SEMA_SEMALAMBDA_H
16 #define LLVM_CLANG_SEMA_SEMALAMBDA_H
17 
18 #include "clang/AST/ASTLambda.h"
19 #include <optional>
20 
21 namespace clang {
22 namespace sema {
23 class FunctionScopeInfo;
24 }
25 class Sema;
26 
27 /// Examines the FunctionScopeInfo stack to determine the nearest
28 /// enclosing lambda (to the current lambda) that is 'capture-capable' for
29 /// the variable referenced in the current lambda (i.e. \p VarToCapture).
30 /// If successful, returns the index into Sema's FunctionScopeInfo stack
31 /// of the capture-capable lambda's LambdaScopeInfo.
32 /// See Implementation for more detailed comments.
33 
34 std::optional<unsigned> getStackIndexOfNearestEnclosingCaptureCapableLambda(
35     ArrayRef<const sema::FunctionScopeInfo *> FunctionScopes,
36     ValueDecl *VarToCapture, Sema &S);
37 
38 } // clang
39 
40 #endif
41