Update C++ requirement to C++20

CMakeLists.txt

@@ -1,4 +1,4 @@
-# Copyright (C) 2016-2023 by Sascha Willems - www.saschawillems.de
+# Copyright (C) 2016-2025 by Sascha Willems - www.saschawillems.de
 # This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
 
 cmake_minimum_required(VERSION 3.4 FATAL_ERROR)
@@ -137,7 +137,7 @@ endif()
 
 
 add_definitions(-D_CRT_SECURE_NO_WARNINGS)
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 file(GLOB SOURCE *.cpp )

README.md

@@ -54,7 +54,7 @@ git submodule update
 
 ## Building
 
-The repository contains everything required to compile and build the examples on <img src="./images/windowslogo.png" alt="" height="22px" valign="bottom"> Windows, <img src="./images/linuxlogo.png" alt="" height="24px" valign="bottom"> Linux, <img src="./images/androidlogo.png" alt="" height="24px" valign="bottom"> Android, <img src="./images/applelogo.png" alt="" valign="bottom" height="24px"> iOS and macOS (using MoltenVK) using a C++ compiler that supports C++14.
+The repository contains everything required to compile and build the examples on <img src="./images/windowslogo.png" alt="" height="22px" valign="bottom"> Windows, <img src="./images/linuxlogo.png" alt="" height="24px" valign="bottom"> Linux, <img src="./images/androidlogo.png" alt="" height="24px" valign="bottom"> Android, <img src="./images/applelogo.png" alt="" valign="bottom" height="24px"> iOS and macOS (using MoltenVK) using a C++ compiler that supports C++20.
 
 See [BUILD.md](BUILD.md) for details on how to build for the different platforms.