From aa3942ab249f89610d8bc38e3dc0a2c4f04f1662 Mon Sep 17 00:00:00 2001
From: Trung Nguyen <57174311+trungnt2910@users.noreply.github.com>
Date: Mon, 10 Feb 2025 14:45:50 +1100
Subject: [PATCH] Internals: `constexpr` for `VlUnpacked` data access (#5725)
 (#5770)

Add `constexpr` to data access functions of `VlUnpacked` whose `std::array` equivalent in C++14 is `constexpr`.
---
 docs/CONTRIBUTORS         | 1 +
 include/verilated_types.h | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/CONTRIBUTORS b/docs/CONTRIBUTORS
index 9fd2ac91ea..5fffcca538 100644
--- a/docs/CONTRIBUTORS
+++ b/docs/CONTRIBUTORS
@@ -215,6 +215,7 @@ Todd Strader
 Tomasz Gorochowik
 Topa Topino
 Toru Niina
+Trung Nguyen
 Tudor Timi
 Tymoteusz Blazejczyk
 Udi Finkelstein
diff --git a/include/verilated_types.h b/include/verilated_types.h
index c7ef5e35dd..3f8b7006d0 100644
--- a/include/verilated_types.h
+++ b/include/verilated_types.h
@@ -1319,7 +1319,7 @@ class VlUnpacked final {
     WData* data() { return &m_storage[0]; }
     const WData* data() const { return &m_storage[0]; }
 
-    std::size_t size() const { return N_Depth; }
+    constexpr std::size_t size() const { return N_Depth; }
     // To fit C++14
     template <std::size_t N_CurrentDimension = 0, typename U = T_Value>
     int find_length(int dimension, std::false_type) const {
@@ -1357,7 +1357,7 @@ class VlUnpacked final {
     }
 
     T_Value& operator[](size_t index) { return m_storage[index]; }
-    const T_Value& operator[](size_t index) const { return m_storage[index]; }
+    constexpr const T_Value& operator[](size_t index) const { return m_storage[index]; }
 
     // *this != that, which might be used for change detection/trigger computation, but avoid
     // operator overloading in VlUnpacked for safety in other contexts.