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32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef COMMON_OSTREAM_H_
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#define COMMON_OSTREAM_H_
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#include "llvm/Support/raw_ostream.h"
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namespace Carbon {
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// Support ostream << for types which implement:
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// void Print(llvm::raw_ostream& out) const;
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template <typename T, typename std::enable_if<std::is_member_function_pointer<
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decltype(&T::Print)>::value>::type* = nullptr>
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auto operator<<(llvm::raw_ostream& out, const T& obj) -> llvm::raw_ostream& {
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obj.Print(out);
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return out;
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}
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// Prevents ostream << for pointers to printable types.
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template <typename T, typename std::enable_if<std::is_member_function_pointer<
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decltype(&T::Print)>::value>::type* = nullptr>
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__attribute__((unavailable(
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"Received a pointer to a printable type, are you missing a `*`? "
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"To print as a pointer, cast to void*."))) auto
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operator<<(llvm::raw_ostream& out, const T* /*obj*/) -> llvm::raw_ostream&;
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} // namespace Carbon
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#endif // COMMON_OSTREAM_H_
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