From e9af3482a6370476b729bae0815878328e07e346 Mon Sep 17 00:00:00 2001
From: Oscar Dowson <o.dowson@gmail.com>
Date: Wed, 8 Apr 2026 10:22:19 +1200
Subject: [PATCH] Add MOA.SolveTimeSecInner

---
 README.md                       |  4 +++-
 src/MultiObjectiveAlgorithms.jl | 21 +++++++++++++++++----
 test/test_model.jl              |  8 ++++++++
 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 82f3154..c7e6c91 100644
--- a/README.md
+++ b/README.md
@@ -93,8 +93,10 @@ the solution process.
  * `MOA.SolutionLimit()`
  * `MOI.TimeLimitSec()`
 
-Query the number of scalar subproblems that were solved using
+There are also the following result attributes that can be queried after the
+solve:
 
+ * `MOA.SolveTimeInner()`
  * `MOA.SubproblemCount()`
 
 For example:
diff --git a/src/MultiObjectiveAlgorithms.jl b/src/MultiObjectiveAlgorithms.jl
index 736145d..d023741 100644
--- a/src/MultiObjectiveAlgorithms.jl
+++ b/src/MultiObjectiveAlgorithms.jl
@@ -224,7 +224,7 @@ mutable struct Optimizer <: MOI.AbstractOptimizer
             Float64[],
             _default(ComputeIdealPoint()),
             0,
-            0.0,
+            NaN,
             optimizer_factory,
         )
     end
@@ -239,6 +239,7 @@ function MOI.empty!(model::Optimizer)
     model.start_time = NaN
     empty!(model.ideal_point)
     model.subproblem_count = 0
+    model.solve_time_inner = NaN
     return
 end
 
@@ -343,9 +344,21 @@ end
 
 ### SolveTimeSec
 
-function MOI.get(model::Optimizer, ::MOI.SolveTimeSec)
-    return model.solve_time
-end
+MOI.get(model::Optimizer, ::MOI.SolveTimeSec) = model.solve_time
+
+### SolveTimeSecInner
+
+"""
+    SolveTimeSecInner <: AbstractModelAttribute -> Float64
+
+A result attribute for querying the total solve time of subproblem solves by an
+algorithm.
+"""
+struct SolveTimeSecInner <: MOI.AbstractModelAttribute end
+
+MOI.is_set_by_optimize(::SolveTimeSecInner) = true
+
+MOI.get(model::Optimizer, ::SolveTimeSecInner) = model.solve_time_inner
 
 ### ObjectiveFunction
 
diff --git a/test/test_model.jl b/test/test_model.jl
index 61adb1f..6c11ec0 100644
--- a/test/test_model.jl
+++ b/test/test_model.jl
@@ -94,8 +94,16 @@ function test_solve_time()
     MOI.set(model, MOI.ObjectiveFunction{typeof(f)}(), f)
     MOI.set(model, MOI.ObjectiveSense(), MOI.MAX_SENSE)
     @test isnan(MOI.get(model, MOI.SolveTimeSec()))
+    @test MOI.is_set_by_optimize(MOA.SolveTimeSecInner())
+    @test isnan(MOI.get(model, MOA.SolveTimeSecInner()))
     MOI.optimize!(model)
     @test MOI.get(model, MOI.SolveTimeSec()) >= 0
+    @test MOI.get(model, MOA.SolveTimeSecInner()) >= 0
+    @test MOI.get(model, MOI.SolveTimeSec()) == model.solve_time
+    @test MOI.get(model, MOA.SolveTimeSecInner()) == model.solve_time_inner
+    MOI.empty!(model)
+    @test isnan(MOI.get(model, MOI.SolveTimeSec()))
+    @test isnan(MOI.get(model, MOA.SolveTimeSecInner()))
     return
 end