// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#ifndef CARBON_TOOLCHAIN_DIAGNOSTICS_NULL_DIAGNOSTICS_H_
#define CARBON_TOOLCHAIN_DIAGNOSTICS_NULL_DIAGNOSTICS_H_
#include "toolchain/diagnostics/diagnostic_emitter.h"
namespace Carbon::Diagnostics {
// Returns a singleton consumer that doesn't print its diagnostics.
inline auto NullConsumer() -> Consumer& {
 struct SingletonConsumer : Consumer {
 auto HandleDiagnostic(Diagnostic /*d*/) -> void override {}
 };
 static auto* consumer = new SingletonConsumer;
 return *consumer;
}
// Returns a singleton emitter that doesn't print its diagnostics.
template <typename LocT>
inline auto NullEmitter() -> Emitter<loct>& {
 class SingletonEmitter : public Emitter<loct> {
 public:
 using Emitter<loct>::Emitter;
 protected:
 // Converts a filename directly to the diagnostic location.
 auto ConvertLoc(LocT /*loc*/,
 Emitter<loct>::ContextFnT /*context_fn*/) const
 -> ConvertedLoc override {
 return {.loc = {}, .last_byte_offset = -1};
 }
 };
 static auto* emitter = new SingletonEmitter(&NullConsumer());
 return *emitter;
}
} // namespace Carbon::Diagnostics
#endif // CARBON_TOOLCHAIN_DIAGNOSTICS_NULL_DIAGNOSTICS_H_
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