From 4bc785386320112b50339dbc4eb6e82b267f2856 Mon Sep 17 00:00:00 2001
From: John Wellbelove <john.wellbelove@etlcpp.com>
Date: Tue, 30 Apr 2024 11:58:24 +0100
Subject: [PATCH] Full constexpr for etl::array

---
 include/etl/array.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/etl/array.h b/include/etl/array.h
index caca9e7e..0a41faed 100644
--- a/include/etl/array.h
+++ b/include/etl/array.h
@@ -115,6 +115,7 @@ namespace etl
     ///\param i The index of the element to access.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     reference at(size_t i)
     {
       ETL_ASSERT(i < SIZE, ETL_ERROR(array_out_of_range));
@@ -141,6 +142,7 @@ namespace etl
     ///\param i The index of the element to access.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     reference operator[](size_t i)
     {
       return _buffer[i];
@@ -161,6 +163,7 @@ namespace etl
     /// Returns a reference to the first element.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     reference front()
     {
       return _buffer[0];
@@ -179,6 +182,7 @@ namespace etl
     /// Returns a reference to the last element.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     reference back()
     {
       return _buffer[SIZE - 1];
@@ -197,6 +201,7 @@ namespace etl
     /// Returns a pointer to the first element of the internal buffer.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     pointer data() ETL_NOEXCEPT
     {
       return &_buffer[0];
@@ -219,6 +224,7 @@ namespace etl
     /// Returns an iterator to the beginning of the array.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     iterator begin() ETL_NOEXCEPT
     {
       return &_buffer[0];
@@ -246,6 +252,7 @@ namespace etl
     /// Returns an iterator to the end of the array.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     iterator end() ETL_NOEXCEPT
     {
       return _buffer + SIZE;
@@ -273,6 +280,7 @@ namespace etl
     // Returns an reverse iterator to the reverse beginning of the array.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     reverse_iterator rbegin() ETL_NOEXCEPT
     {
       return reverse_iterator(end());
@@ -300,6 +308,7 @@ namespace etl
     /// Returns a reverse iterator to the end of the array.
     //*************************************************************************
     ETL_NODISCARD
+    ETL_CONSTEXPR14
     reverse_iterator rend() ETL_NOEXCEPT
     {
       return reverse_iterator(begin());