From 48d06162b36e233ee39d99907469231983d74060 Mon Sep 17 00:00:00 2001
From: Geoffroy Leconte <gleconte50@gmail.com>
Date: Wed, 3 Jan 2024 12:52:23 -0500
Subject: [PATCH] Adjoint opEye

---
 src/special-operators.jl | 4 ++++
 test/test_linop.jl       | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/src/special-operators.jl b/src/special-operators.jl
index 4f658d6a..c58e857a 100644
--- a/src/special-operators.jl
+++ b/src/special-operators.jl
@@ -25,6 +25,10 @@ struct opEye <: AbstractLinearOperator{Any} end
 *(T::AbstractLinearOperator, ::opEye) = T
 *(::opEye, T::opEye) = T
 
+adjoint(A::opEye) = A
+transpose(A::opEye) = A
+conj(A::opEye) = A
+
 function show(io::IO, op::opEye)
   println(io, "Identity operator")
 end
diff --git a/test/test_linop.jl b/test/test_linop.jl
index f65f1bcd..64b666c6 100644
--- a/test/test_linop.jl
+++ b/test/test_linop.jl
@@ -269,6 +269,10 @@ function test_linop()
       op2 = opEye()
       @test op === op2
       @test op === op * op2 === op2 * op
+
+      @test norm(transpose(op) * v - v) <= ϵ * norm(v)
+      @test norm(adjoint(op) * v - v) <= ϵ * norm(v)
+      @test norm(conj(op) * v - v) <= ϵ * norm(v)
     end
 
     @testset "Ones" begin