diff options
Diffstat (limited to 'chromium/v8/src/base/template-utils.h')
| -rw-r--r-- | chromium/v8/src/base/template-utils.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/chromium/v8/src/base/template-utils.h b/chromium/v8/src/base/template-utils.h index 8f89672e1af..617ef6ce34b 100644 --- a/chromium/v8/src/base/template-utils.h +++ b/chromium/v8/src/base/template-utils.h @@ -7,6 +7,7 @@ #include <array> #include <functional> +#include <iosfwd> #include <type_traits> #include <utility> @@ -22,6 +23,12 @@ constexpr inline auto make_array_helper(Function f, return {{f(Indexes)...}}; } +template <template <size_t> class Value, std::size_t... Indexes> +constexpr inline auto make_array_helper(std::index_sequence<Indexes...>) + -> std::array<typename Value<0>::value_type, sizeof...(Indexes)> { + return {{Value<Indexes>()...}}; +} + } // namespace detail // base::make_array: Create an array of fixed length, initialized by a function. @@ -35,6 +42,13 @@ constexpr auto make_array(Function f) { return detail::make_array_helper(f, std::make_index_sequence<Size>{}); } +// The same as above, but taking a template instead of a function to generate +// the values for the array. +template <std::size_t Size, template <size_t> class Value> +constexpr auto make_array() { + return detail::make_array_helper<Value>(std::make_index_sequence<Size>{}); +} + // Helper to determine how to pass values: Pass scalars and arrays by value, // others by const reference (even if it was a non-const ref before; this is // disallowed by the style guide anyway). |