32 lines
937 B
C++
32 lines
937 B
C++
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// This file contains the helper classes and methods for using field tuples
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// used by metrics classes to record variations of a single metric.
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#ifndef WVCDM_METRICS_FIELD_TUPLES_H_
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#define WVCDM_METRICS_FIELD_TUPLES_H_
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#include <ostream>
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#include <sstream>
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namespace wvcdm {
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namespace metrics {
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namespace util {
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// TODO(blueeyes): Change to use C++ 11 support for variadic template args.
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// The C++ 03 pattern is no longer needed since we require C++11. b/68766426.
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// This is a placeholder type for unused type parameters. It aids in supporting
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// templated classes with "variable" type arguments.
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struct Unused {
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// Required for compilation. Should never be used.
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inline friend std::ostream& operator<<(std::ostream& out, const Unused&) {
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return out;
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}
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};
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} // namespace util
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} // namespace metrics
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} // namespace wvcdm
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#endif // WVCDM_METRICS_FIELD_TUPLES_H_
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