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James M Snell
6456418ac1
Long-term itch. Per v8 rules, we're not supposed to be heap allocating v8::Local's; instead we're supposed to be using v8::LocalVector. Create a specialization of MaybeStackBuffer that uses either a stack array of v8::Locals or v8::LocalVector with some additional utility improvements. Signed-off-by: James M Snell <jasnell@gmail.com> PR-URL: https://github.com/nodejs/node/pull/65159 Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
#ifndef SRC_NODE_CONCEPTS_H_
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#define SRC_NODE_CONCEPTS_H_
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
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#include <v8.h>
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#include <concepts>
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#include <limits>
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#include <type_traits>
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namespace node {
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// A numeric type recognized by std::numeric_limits.
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// The is_array guard prevents a hard error from instantiating
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// numeric_limits<T[N]>, whose member functions would return array types.
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template <typename T>
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concept NumericValue = !
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std::is_array_v<T>&& std::numeric_limits<T>::is_specialized;
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// A numeric type or an enum (which has an underlying numeric type).
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template <typename T>
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concept NumericOrEnum = NumericValue<T> || std::is_enum_v<T>;
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// A type that has a valid std::char_traits specialization, as required by
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// std::basic_string and std::basic_string_view.
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template <typename T>
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concept StandardCharType =
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std::is_same_v<T, char> || std::is_same_v<T, wchar_t> ||
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std::is_same_v<T, char8_t> || std::is_same_v<T, char16_t> ||
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std::is_same_v<T, char32_t>;
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// Test whether some value can be called with ().
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template <typename T>
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concept IsCallable = std::is_function<T>::value || requires { &T::operator(); };
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// Types that can reside on V8's managed heap (v8::Value, v8::Object, etc.).
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// Used to select the MaybeStackBuffer specialization that holds handles in a
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// v8::LocalVector instead of malloc'd memory.
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template <typename T>
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concept V8Type = std::is_base_of_v<v8::Data, T>;
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} // namespace node
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#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
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#endif // SRC_NODE_CONCEPTS_H_
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