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Fix ambiguity between clamp implementations

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There is an ambiguity between global and std clamp implementations when compiling in c++17,
and on certain toolchains that are not strictly conforming to c++11.
This is solved by putting our clamp implementation in a namespace.

closes https://github.com/official-stockfish/Stockfish/pull/2572

No functional change.
This commit is contained in:
Gary Heckman
2020-03-05 12:37:08 -05:00
committed by Joost VandeVondele
parent 9690cd6295
commit 37e3863927
7 changed files with 16 additions and 10 deletions
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src/search.cpp
+3 -3
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@@ -365,7 +365,7 @@ void Thread::search() {
// for match (TC 60+0.6) results spanning a wide range of k values.
PRNG rng(now());
double floatLevel = Options["UCI_LimitStrength"] ?
clamp(std::pow((Options["UCI_Elo"] - 1346.6) / 143.4, 1 / 0.806), 0.0, 20.0) :
Utility::clamp(std::pow((Options["UCI_Elo"] - 1346.6) / 143.4, 1 / 0.806), 0.0, 20.0) :
double(Options["Skill Level"]);
int intLevel = int(floatLevel) +
((floatLevel - int(floatLevel)) * 1024 > rng.rand<unsigned>() % 1024 ? 1 : 0);
@@ -538,7 +538,7 @@ void Thread::search() {
{
double fallingEval = (332 + 6 * (mainThread->previousScore - bestValue)
+ 6 * (mainThread->iterValue[iterIdx] - bestValue)) / 704.0;
fallingEval = clamp(fallingEval, 0.5, 1.5);
fallingEval = Utility::clamp(fallingEval, 0.5, 1.5);
// If the bestMove is stable over several iterations, reduce time accordingly
timeReduction = lastBestMoveDepth + 9 < completedDepth ? 1.94 : 0.91;
@@ -1197,7 +1197,7 @@ moves_loop: // When in check, search starts from here
else if (depth < 8 && moveCount > 2)
r++;
Depth d = clamp(newDepth - r, 1, newDepth);
Depth d = Utility::clamp(newDepth - r, 1, newDepth);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true);