45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
//===--- LazyDetector.h - Lazy ToolChain Detection --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_LAZYDETECTOR_H
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#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_LAZYDETECTOR_H
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#include "clang/Driver/Tool.h"
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#include "clang/Driver/ToolChain.h"
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#include <optional>
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namespace clang {
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/// Simple wrapper for toolchain detector with costly initialization. This
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/// delays the creation of the actual detector until its first usage.
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template <class T> class LazyDetector {
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const driver::Driver &D;
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llvm::Triple Triple;
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const llvm::opt::ArgList &Args;
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std::optional<T> Detector;
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public:
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LazyDetector(const driver::Driver &D, const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args)
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: D(D), Triple(Triple), Args(Args) {}
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T *operator->() {
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if (!Detector)
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Detector.emplace(D, Triple, Args);
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return &*Detector;
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}
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const T *operator->() const {
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return const_cast<T const *>(
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const_cast<LazyDetector &>(*this).operator->());
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}
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};
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} // end namespace clang
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#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_LAZYDETECTOR_H
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