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Queue: use C++ random instead of GLib's GRand

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This commit is contained in:
Max Kellermann 2013-01-07 21:07:30 +01:00
parent 5b8b7d1412
commit c6281b2680
3 changed files with 20 additions and 10 deletions
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2
Makefile.am
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@ -1337,8 +1337,10 @@ test_test_pcm_LDADD = \
test_TestQueuePriority_SOURCES = \
src/Queue.cxx \
src/fd_util.c \
test/TestQueuePriority.cxx
test_TestQueuePriority_LDADD = \
libutil.a \
$(GLIB_LIBS)
noinst_PROGRAMS += src/dsd2pcm/dsd2pcm

25
src/Queue.cxx
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@ -33,8 +33,7 @@ queue::queue(unsigned _max_length)
repeat(false),
single(false),
consume(false),
random(false),
rand(g_rand_new())
random(false)
{
for (unsigned i = 0; i < max_length * QUEUE_HASH_MULT; ++i)
id_to_position[i] = -1;
@ -47,8 +46,6 @@ queue::~queue()
g_free(items);
g_free(order);
g_free(id_to_position);
g_rand_free(rand);
}
/**
@ -375,8 +372,8 @@ queue::ShuffleOrderRange(unsigned start, unsigned end)
assert(start <= end);
assert(end <= length);
for (unsigned i = start; i < end; ++i)
SwapOrders(i, g_rand_int_range(rand, i, end));
rand.AutoCreate();
std::shuffle(order + start, order + end, rand);
}
/**
@ -426,13 +423,19 @@ queue::ShuffleOrder()
void
queue::ShuffleOrderFirst(unsigned start, unsigned end)
{
SwapOrders(start, g_rand_int_range(rand, start, end));
rand.AutoCreate();
std::uniform_int_distribution<unsigned> distribution(start, end - 1);
SwapOrders(start, distribution(rand));
}
void
queue::ShuffleOrderLast(unsigned start, unsigned end)
{
SwapOrders(end - 1, g_rand_int_range(rand, start, end));
rand.AutoCreate();
std::uniform_int_distribution<unsigned> distribution(start, end - 1);
SwapOrders(end - 1, distribution(rand));
}
void
@ -441,8 +444,12 @@ queue::ShuffleRange(unsigned start, unsigned end)
assert(start <= end);
assert(end <= length);
rand.AutoCreate();
for (unsigned i = start; i < end; i++) {
unsigned ri = g_rand_int_range(rand, i, end);
std::uniform_int_distribution<unsigned> distribution(start,
end - 1);
unsigned ri = distribution(rand);
SwapPositions(i, ri);
}
}

3
src/Queue.hxx
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@ -21,6 +21,7 @@
#define MPD_QUEUE_HXX
#include "gcc.h"
#include "util/LazyRandomEngine.hxx"
#include <glib.h>
@ -101,7 +102,7 @@ struct queue {
bool random;
/** random number generator for shuffle and random mode */
GRand *rand;
LazyRandomEngine rand;
queue(unsigned max_length);