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This uses “static” at function scope to avoid making local copies, even in cases where the compiler can’t see that the local copy is unnecessary. “constexpr” adds additional safety in that it prevents global state from being initialized from any runtime dependencies, which would be undesirable. At namespace scope, “constexpr” is also used where appropriate. For the most part, this was a mechanical transformation for things matching '(^| )const [^=]*\['. Similar transformations could be applied to non-arrays in some cases, but there’s limited practical impact in most non-array cases relative to arrays, there are far more use sites, and much more manual intervention would be required. Change-Id: I3513b739ee8b0be026f8285475cddc5f9cc81152 Reviewed-on: https://chromium-review.googlesource.com/583997 Commit-Queue: Mark Mentovai <mark@chromium.org> Reviewed-by: Leonard Mosescu <mosescu@chromium.org>
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
// Copyright 2015 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_MISC_IMPLICIT_CAST_H_
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#define CRASHPAD_UTIL_MISC_IMPLICIT_CAST_H_
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namespace crashpad {
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// Use implicit_cast as a safe version of static_cast or const_cast
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// for upcasting in the type hierarchy (i.e. casting a pointer to Foo
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// to a pointer to SuperclassOfFoo or casting a pointer to Foo to
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// a const pointer to Foo).
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// When you use implicit_cast, the compiler checks that the cast is safe.
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// Such explicit implicit_casts are necessary in surprisingly many
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// situations where C++ demands an exact type match instead of an
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// argument type convertible to a target type.
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//
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// The From type can be inferred, so the preferred syntax for using
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// implicit_cast is the same as for static_cast etc.:
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//
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// implicit_cast<ToType>(expr)
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//
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// implicit_cast would have been part of the C++ standard library,
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// but the proposal was submitted too late. It will probably make
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// its way into the language in the future.
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template <typename To, typename From>
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constexpr To implicit_cast(From const& f) {
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return f;
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}
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_MISC_IMPLICIT_CAST_H_
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