Update C++ std requirement from 17 to 20

The C++20 feature designated initializers was already used in types.h,
resulting in a C7555 compilation error on MSVC

3 files changed, 11 insertions, 11 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 05a4102..e9f929d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ cmake_minimum_required(VERSION 3.19)
 Project(InkStrokeModeler VERSION 0.1 LANGUAGES CXX)
 
 if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
-  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_STANDARD 20)
   set(CMAKE_CXX_STANDARD_REQUIRED ON)
   option(INK_STROKE_MODELER_BUILD_TESTING "Build tests and testonly libraries" ON)
   option(INK_STROKE_MODELER_ENABLE_INSTALL "Enable install rule" ON)
@@ -83,9 +83,9 @@ else()
   FetchContent_MakeAvailable(absl)
 endif()
 
-if(CMAKE_CXX_STANDARD LESS 17)
+if(CMAKE_CXX_STANDARD LESS 20)
   message(FATAL_ERROR
-      "${PROJECT_NAME} requires CMAKE_CXX_STANDARD >= 17 (got: ${CMAKE_CXX_STANDARD})")
+      "${PROJECT_NAME} requires CMAKE_CXX_STANDARD >= 20 (got: ${CMAKE_CXX_STANDARD})")
 endif()
 
 include_directories("${CMAKE_SOURCE_DIR}")
diff --git a/README.md b/README.md
index 22ee44c..fdeb72b 100644
--- a/README.md
+++ b/README.md
@@ -46,12 +46,12 @@ if you want to use a local checkout of Ink Stroke Modeler instead, use the
 [`local_repository`](https://bazel.build/reference/be/workspace#local_repository)
 workspace rule instead of `git_repository`.
 
-Since Ink Stroke Modler requires C++17, it must be built with
-`--cxxopt='-std=c++17'` (or similar indicating a newer version). You can put the
+Since Ink Stroke Modler requires C++20, it must be built with
+`--cxxopt='-std=c++20'` (or similar indicating a newer version). You can put the
 following in your project's `.bazelrc` to use this by default:
 
 ```none
-build --cxxopt='-std=c++17'
+build --cxxopt='-std=c++20'
 ```
 
 Then you can include the following in your targets' `deps`:
@@ -81,10 +81,10 @@ submodule:
 git submodule add https://github.com/google/ink-stroke-modeler
 ```
 
-And then include it in your `CMakeLists.txt`, requiring at least C++17:
+And then include it in your `CMakeLists.txt`, requiring at least C++20:
 
 ```cmake
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # If you want to use installed (or already fetched) versions of Abseil and/or
 # GTest (for example, if you've installed libabsl-dev and libgtest-dev), add:
diff --git a/workspace.bzl b/workspace.bzl
index 00fc679..1c41b3e 100644
--- a/workspace.bzl
+++ b/workspace.bzl
@@ -40,11 +40,11 @@ local_repository(
     path = "path/to/ink-stroke-modeler",
 )
 
-Ink Stroke Modeler requires C++17. This is not currently the default for Bazel,
---cxxopt='-std=c++17' (or newer) is required. You can put the following in
+Ink Stroke Modeler requires C++20. This is not currently the default for Bazel,
+--cxxopt='-std=c++20' (or newer) is required. You can put the following in
 .bazelrc at your project's root:
 
-build --cxxopt='-std=c++17'
+build --cxxopt='-std=c++20'
 """
 
 load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")