Typos and some C++ code for screenshot

README.md

@@ -61,7 +61,7 @@ You can modify the following lists to recognize more words or set it to `nil` to
  * `modern-c++-preprocessors` - `#define`, `__LINE__`, `__cplusplus`...
  * `modern-c++-types` - `bool`, `char`, `double`...
 
-Set to `t` to enable the following options or otherwise to `nil`:
+Set to `t` (default value) to enable the following options or otherwise to `nil`:
 
  * `modern-c++-literal-interger` - `0b101010`, `18446744073709550592LLU`, `0XdeadBABEu`...
 

preview.cc

@@ -0,0 +1,26 @@
+#pragma once
+
+#define CONCATENATE_IMPL(s1, s2) s1##s2
+#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2)
+#define ANONYMOUS_VARIABLE(str) CONCATENATE(str, __LINE__)
+
+constexpr int pi = 314LLu;
+thread_local decltype(pi) rage = 0b10;
+
+[[deprecated("abc")]] char16_t *f() noexcept { return nullptr; }
+
+static_assert(std::is_copy_constructible<T>::value, "Swap requires copying");
+
+template <typename T> struct Foo {
+  static_assert(std::is_floating_point<T>::value,
+                "Foo<T>: T must be floating point");
+};
+
+struct A final : Foo {
+  A() = default;
+  [[noreturn]] virtual void foo() override;
+};
+
+template <typename T> concept bool EqualityComparable = requires(T a, T b) {
+  { a == b } -> bool;
+};