FTL: Allow Concat of bool and char
Also, allow references to integral types.
Bug: 185536303
Test: ftl_test
Change-Id: Ic9be008ed7f72ecdb7a369b01bc5a8235b35ac2c
diff --git a/include/ftl/details/concat.h b/include/ftl/details/concat.h
index 8ce949e..726ba02 100644
--- a/include/ftl/details/concat.h
+++ b/include/ftl/details/concat.h
@@ -19,6 +19,7 @@
#include <functional>
#include <string_view>
+#include <ftl/details/type_traits.h>
#include <ftl/string.h>
namespace android::ftl::details {
@@ -26,16 +27,42 @@
template <typename T, typename = void>
struct StaticString;
+// Booleans.
template <typename T>
-struct StaticString<T, std::enable_if_t<std::is_integral_v<T>>> {
- static constexpr std::size_t N = to_chars_length_v<T>;
+struct StaticString<T, std::enable_if_t<is_bool_v<T>>> {
+ static constexpr std::size_t N = 5; // Length of "false".
- explicit StaticString(T v) : view(to_chars(buffer, v)) {}
+ explicit constexpr StaticString(bool b) : view(b ? "true" : "false") {}
- to_chars_buffer_t<T> buffer;
const std::string_view view;
};
+// Characters.
+template <typename T>
+struct StaticString<T, std::enable_if_t<is_char_v<T>>> {
+ static constexpr std::size_t N = 1;
+
+ explicit constexpr StaticString(char c) : character(c) {}
+
+ const char character;
+ const std::string_view view{&character, 1u};
+};
+
+// Integers, including the integer value of other character types like char32_t.
+template <typename T>
+struct StaticString<
+ T, std::enable_if_t<std::is_integral_v<remove_cvref_t<T>> && !is_bool_v<T> && !is_char_v<T>>> {
+ using U = remove_cvref_t<T>;
+ static constexpr std::size_t N = to_chars_length_v<U>;
+
+ // TODO: Mark this and to_chars as `constexpr` in C++23.
+ explicit StaticString(U v) : view(to_chars(buffer, v)) {}
+
+ to_chars_buffer_t<U> buffer;
+ const std::string_view view;
+};
+
+// Character arrays.
template <std::size_t M>
struct StaticString<const char (&)[M], void> {
static constexpr std::size_t N = M - 1;
@@ -50,6 +77,7 @@
std::string_view view;
};
+// Strings with constrained length.
template <std::size_t M>
struct StaticString<Truncated<M>, void> {
static constexpr std::size_t N = M;