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multi_buffer::clear preserves capacity

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This commit is contained in:
Vinnie Falco
2019-02-07 17:37:18 -08:00
parent c3125e8358
commit 55d319a9d9
4 changed files with 307 additions and 97 deletions
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test/beast/core/multi_buffer.cpp
+113 -12
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@@ -53,6 +53,112 @@ public:
buffers_to_string(mb2.data());
}
void
testShrinkToFit()
{
// empty list
{
multi_buffer b;
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
}
// zero readable bytes
{
multi_buffer b;
b.prepare(512);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
}
{
multi_buffer b;
b.prepare(512);
b.commit(32);
b.consume(32);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
}
{
multi_buffer b;
b.prepare(512);
b.commit(512);
b.prepare(512);
b.clear();
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
}
// unused list
{
multi_buffer b;
b.prepare(512);
b.commit(512);
b.prepare(512);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 512);
BEAST_EXPECT(b.capacity() == 512);
}
{
multi_buffer b;
b.prepare(512);
b.commit(512);
b.prepare(512);
b.prepare(1024);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 512);
BEAST_EXPECT(b.capacity() == 512);
}
// partial last buffer
{
multi_buffer b;
b.prepare(512);
b.commit(512);
b.prepare(512);
b.commit(88);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 600);
BEAST_EXPECT(b.capacity() == 600);
}
// shrink front of first buffer
{
multi_buffer b;
b.prepare(512);
b.commit(512);
b.consume(12);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 500);
BEAST_EXPECT(b.capacity() == 500);
}
// shrink ends of first buffer
{
multi_buffer b;
b.prepare(512);
b.commit(500);
b.consume(100);
b.shrink_to_fit();
BEAST_EXPECT(b.size() == 400);
BEAST_EXPECT(b.capacity() == 400);
}
}
void
testDynamicBuffer()
{
@@ -496,18 +602,14 @@ public:
// clear
{
multi_buffer b;
BEAST_EXPECT(b.capacity() == 0);
b.prepare(50);
BEAST_EXPECT(b.capacity() >= 50);
b.commit(50);
BEAST_EXPECT(b.size() == 50);
BEAST_EXPECT(b.capacity() == 512);
b.clear();
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
b.prepare(80);
b.commit(30);
BEAST_EXPECT(b.size() == 30);
BEAST_EXPECT(b.capacity() >= 80);
b.clear();
BEAST_EXPECT(b.size() == 0);
BEAST_EXPECT(b.capacity() == 0);
BEAST_EXPECT(b.capacity() == 512);
}
// swap
@@ -714,13 +816,12 @@ public:
void
run() override
{
#if 1
testShrinkToFit();
testDynamicBuffer();
testMembers();
testMatrix1();
testMatrix2();
#if 0
testIterators();
testMutableData<multi_buffer>();
#endif
}
};