Requires C++20 now

Author: Blake-Madden

README.md

@@ -40,7 +40,7 @@ Note: for current users of *TinyExpr++*, please see the [compatibility advisory]
 
 ## Features
 
-- **C++17 with no dependencies**.
+- **C++20 with no dependencies**.
 - Single source file and header file.
 - Simple and fast.
 - Implements standard operator precedence.

docs/manual/building.qmd

@@ -11,6 +11,6 @@ doxygen docs/Doxyfile
 
 ## Requirements {-}
 
-*TinyExpr++* must be compiled as C++17.\index{compiling!requirements} (Some additional features require C++20.)
+*TinyExpr++* must be compiled as C++20.\index{compiling!requirements}
 
 MSVC, GCC, and Clang compilers are supported.

docs/manual/index.qmd

@@ -31,7 +31,7 @@ It's open-source, free, easy-to-use, and self-contained in a single source and h
 
 ## Features {-}
 
-- C++17 with no dependencies.
+- C++20 with no dependencies.
 - Single source file and header file.
 - Simple and fast.
 - Implements standard operator precedence.