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957a081892
The C++ interface is intentionally minimal: it provides only a couple of niceties in order to largely stay out of the way. It is mostly used to provide: * RAII for opaque resources * Safe up and down casting for nodes * string_view for various resources * Iteration over resource lists Note that if consumers want to use it, they must be on C++17 at minimum. https://github.com/ruby/prism/commit/57b8dbe0e9
39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
/**
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* @file node_type.hpp
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*
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* The traits that map node structs to node types. The specialization for each
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* node struct is generated into ast.hpp.
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*/
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#ifndef PRISM_NODE_TYPE_HPP
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#define PRISM_NODE_TYPE_HPP
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#include "prism/compiler/cplusplus.hpp"
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#include "prism/ast.h"
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#include <type_traits>
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namespace prism {
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/**
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* Maps a node struct to its node type, as in node_type<pm_call_node_t>::value
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* being PM_CALL_NODE. Only the node structs declared in ast.h have a value.
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*/
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template <typename T> struct node_type {};
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/** The node type of the given node struct. */
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template <typename T> inline constexpr pm_node_type_t node_type_v = node_type<T>::value;
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/** Whether the given type is one of the node structs declared in ast.h. */
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template <typename T, typename = void> struct is_node : std::false_type {};
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/** Whether the given type is one of the node structs declared in ast.h. */
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template <typename T> struct is_node<T, std::void_t<decltype(node_type<T>::value)>> : std::true_type {};
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/** Whether the given type is one of the node structs declared in ast.h. */
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template <typename T> inline constexpr bool is_node_v = is_node<T>::value;
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}
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#endif
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