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Issue #187 : Add peek_back to tpie::file_stream #261

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Issue #187 : Add peek_back to tpie::file_stream #261

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7085366
Fix typo 'peak' -> 'peek'
SSoelvsten Jul 27, 2022
60ed841
Rename 'peek_unlikely' to 'read_unlikely' to better convey direction
SSoelvsten Jul 27, 2022
0bfa3ff
Whitespace and documentation clean up in file_stream
SSoelvsten Jul 27, 2022
c404113
Add read_back(...) with iterators
SSoelvsten Jul 27, 2022
69d1e88
Add peek_back function
SSoelvsten Jul 27, 2022
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2 changes: 2 additions & 0 deletions test/unit/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,8 @@ add_unittest(stream
user_data_file
peek_skip_1
peek_skip_2
peek_back_skip
peek_back_throw
backwards_compressed
extend_compressed
truncate_compressed
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50 changes: 50 additions & 0 deletions test/unit/test_stream.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -769,6 +769,54 @@ bool peek_skip_test_2() {
return true;
}

bool peek_back_skip_test() {
tpie::file_stream<size_t> s;
s.open();
for (size_t i = 0; i < 1000000; ++i) s.write(i);

s.seek(42);
TEST_ENSURE(s.peek_back() == 41, "peek_back() wrong");

s.seek(100);
TEST_ENSURE(s.peek_back() == 99, "peek_back() wrong");

s.seek(10000);
TEST_ENSURE(s.peek_back() == 9999, "peek_back() wrong");
s.skip();
TEST_ENSURE(s.peek_back() == 10000, "peek_back() wrong");
s.skip_back();
TEST_ENSURE(s.peek_back() == 9999, "peek_back() wrong");

s.seek(1000000);
TEST_ENSURE(s.peek_back() == 999999, "peek_back() wrong");

s.skip_back();
TEST_ENSURE(s.peek_back() == 999998, "peek_back() wrong");

s.seek(100000);
s.skip();
TEST_ENSURE(s.peek_back() == 100000, "peek_back() wrong");

return true;
}

bool peek_back_throw_test() {
tpie::file_stream<size_t> s;
s.open();
for (size_t i = 0; i < 1000; ++i) s.write(i);

bool threw = false;
s.seek(0);
try {
s.peek_back();
} catch (tpie::end_of_stream_exception &) {
threw = true;
}
TEST_ENSURE(threw, "peek_back() did throw");

return true;
}

bool reopen() {
tpie::temp_file tf;

Expand Down Expand Up @@ -818,5 +866,7 @@ int main(int argc, char **argv) {
.test(stream_tester<file_colon_colon_stream>::user_data_test, "user_data_file")
.test(peek_skip_test_1, "peek_skip_1")
.test(peek_skip_test_2, "peek_skip_2")
.test(peek_back_skip_test, "peek_back_skip")
.test(peek_back_throw_test, "peek_back_throw")
;
}
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