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Use log2 now that NDK requires at least API 21 which includes it. (#1822)
Fixes #1820
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@ -27,7 +27,6 @@ namespace benchmark {
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// Internal function to calculate the different scalability forms
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BigOFunc* FittingCurve(BigO complexity) {
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static const double kLog2E = 1.44269504088896340736;
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switch (complexity) {
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case oN:
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return [](IterationCount n) -> double { return static_cast<double>(n); };
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@ -36,15 +35,12 @@ BigOFunc* FittingCurve(BigO complexity) {
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case oNCubed:
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return [](IterationCount n) -> double { return std::pow(n, 3); };
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case oLogN:
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/* Note: can't use log2 because Android's GNU STL lacks it */
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return [](IterationCount n) {
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return kLog2E * std::log(static_cast<double>(n));
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return [](IterationCount n) -> double {
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return std::log2(static_cast<double>(n));
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};
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case oNLogN:
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/* Note: can't use log2 because Android's GNU STL lacks it */
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return [](IterationCount n) {
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return kLog2E * static_cast<double>(n) *
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std::log(static_cast<double>(n));
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return [](IterationCount n) -> double {
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return static_cast<double>(n) * std::log2(static_cast<double>(n));
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};
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case o1:
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default:
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