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64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
// Copyright (c) 2015 Ryan Prichard
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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// Convenience header library for using the high-resolution performance counter
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// to measure how long some process takes.
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#ifndef TIME_MEASUREMENT_H
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#define TIME_MEASUREMENT_H
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#include <windows.h>
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#include <assert.h>
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#include <stdint.h>
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class TimeMeasurement {
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public:
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TimeMeasurement() {
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static double freq = static_cast<double>(getFrequency());
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m_freq = freq;
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m_start = value();
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}
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double elapsed() {
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uint64_t elapsedTicks = value() - m_start;
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return static_cast<double>(elapsedTicks) / m_freq;
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}
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private:
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uint64_t getFrequency() {
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LARGE_INTEGER freq;
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BOOL success = QueryPerformanceFrequency(&freq);
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assert(success && "QueryPerformanceFrequency failed");
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return freq.QuadPart;
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}
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uint64_t value() {
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LARGE_INTEGER ret;
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BOOL success = QueryPerformanceCounter(&ret);
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assert(success && "QueryPerformanceCounter failed");
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return ret.QuadPart;
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}
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uint64_t m_start;
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double m_freq;
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};
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#endif // TIME_MEASUREMENT_H
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