Danny Robson
f6056153e3
This places, at long last, the core library code into the same namespace as the extended library code.
39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2017 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_TYPEIDX_HPP
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#define CRUFT_UTIL_TYPEIDX_HPP
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#include <cstdint>
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namespace cruft {
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namespace detail { int typeidx_next (void); }
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/// return a globally unique runtime ID for a given type.
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///
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/// this is intended to be used as a lightweight type check for variants
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/// and such without requiring RTTI.
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///
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/// the identifier is constructed at runtime and is not guaranteed to be
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/// stable across executions (particularly in the case of threads and
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/// other non-determinism). however it _is_ threadsafe to call this.
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///
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/// the range of identifiers is _probably_ contiguous starting from zero.
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/// this should not be relied upon for correctness, but may be used for
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/// performance concerns.
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template <typename T>
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int
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typeidx (void)
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{
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static auto id = detail::typeidx_next ();
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return id;
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}
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}
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#endif
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