mirror of https://github.com/oxen-io/oxen-core.git
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
// Copyright (c) 2018, The Loki Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef OXEN_H
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#define OXEN_H
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#include <cstddef>
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#include <utility>
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#define OXEN_RPC_DOC_INTROSPECT
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namespace oxen {
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double round(double);
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double exp2(double);
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template <typename lambda_t>
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struct deferred {
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private:
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lambda_t lambda;
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bool cancelled = false;
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public:
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deferred(lambda_t lambda) : lambda(lambda) {}
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void invoke() {
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lambda();
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cancelled = true;
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} // Invoke early instead of at destruction
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void cancel() { cancelled = true; } // Cancel invocation at destruction
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~deferred() {
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if (!cancelled)
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lambda();
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}
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deferred(deferred<lambda_t>&& d) : lambda{std::move(d.lambda)}, cancelled{d.cancelled} {
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d.cancel();
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}
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deferred& operator=(deferred<lambda_t>&& d) {
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lambda = std::move(d.lambda);
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cancelled = d.cancelled;
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d.cancel();
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return *this;
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}
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deferred(const deferred<lambda_t>&) = delete;
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deferred& operator=(const deferred<lambda_t>&) = delete;
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};
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template <typename lambda_t>
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[[nodiscard]] deferred<lambda_t> defer(lambda_t lambda) {
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return lambda;
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}
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struct defer_helper {
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template <typename lambda_t>
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deferred<lambda_t> operator+(lambda_t lambda) {
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return lambda;
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}
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};
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#define OXEN_TOKEN_COMBINE2(x, y) x##y
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#define OXEN_TOKEN_COMBINE(x, y) OXEN_TOKEN_COMBINE2(x, y)
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#define OXEN_DEFER \
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auto const OXEN_TOKEN_COMBINE(oxen_defer_, __LINE__) = oxen::defer_helper() + [&]()
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template <typename T, size_t N>
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constexpr size_t array_count(T (&)[N]) {
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return N;
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}
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template <typename T, size_t N>
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constexpr size_t char_count(T (&)[N]) {
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return N - 1;
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}
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}; // namespace oxen
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#endif // OXEN_H
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