using llvm::yaml::Hex64;
+
+
+static void suppressErrorMessages(const llvm::SMDiagnostic &, void *) {
+}
+
+
+
//===----------------------------------------------------------------------===//
// Test MappingTraits
//===----------------------------------------------------------------------===//
//
TEST(YAMLIO, TestMapRead) {
FooBar doc;
- Input yin("---\nfoo: 3\nbar: 5\n...\n");
- yin >> doc;
+ {
+ Input yin("---\nfoo: 3\nbar: 5\n...\n");
+ yin >> doc;
- EXPECT_FALSE(yin.error());
- EXPECT_EQ(doc.foo, 3);
- EXPECT_EQ(doc.bar,5);
+ EXPECT_FALSE(yin.error());
+ EXPECT_EQ(doc.foo, 3);
+ EXPECT_EQ(doc.bar, 5);
+ }
+
+ {
+ Input yin("{foo: 3, bar: 5}");
+ yin >> doc;
+
+ EXPECT_FALSE(yin.error());
+ EXPECT_EQ(doc.foo, 3);
+ EXPECT_EQ(doc.bar, 5);
+ }
}
+TEST(YAMLIO, TestMalformedMapRead) {
+ FooBar doc;
+ Input yin("{foo: 3; bar: 5}", nullptr, suppressErrorMessages);
+ yin >> doc;
+ EXPECT_TRUE(!!yin.error());
+}
//
// Test the reading of a yaml sequence of mappings
struct BuiltInTypes {
llvm::StringRef str;
+ std::string stdstr;
uint64_t u64;
uint32_t u32;
uint16_t u16;
struct MappingTraits<BuiltInTypes> {
static void mapping(IO &io, BuiltInTypes& bt) {
io.mapRequired("str", bt.str);
+ io.mapRequired("stdstr", bt.stdstr);
io.mapRequired("u64", bt.u64);
io.mapRequired("u32", bt.u32);
io.mapRequired("u16", bt.u16);
BuiltInTypes map;
Input yin("---\n"
"str: hello there\n"
+ "stdstr: hello where?\n"
"u64: 5000000000\n"
"u32: 4000000000\n"
"u16: 65000\n"
EXPECT_FALSE(yin.error());
EXPECT_TRUE(map.str.equals("hello there"));
+ EXPECT_TRUE(map.stdstr == "hello where?");
EXPECT_EQ(map.u64, 5000000000ULL);
EXPECT_EQ(map.u32, 4000000000U);
EXPECT_EQ(map.u16, 65000);
{
BuiltInTypes map;
map.str = "one two";
+ map.stdstr = "three four";
map.u64 = 6000000000ULL;
map.u32 = 3000000000U;
map.u16 = 50000;
EXPECT_FALSE(yin.error());
EXPECT_TRUE(map.str.equals("one two"));
+ EXPECT_TRUE(map.stdstr == "three four");
EXPECT_EQ(map.u64, 6000000000ULL);
EXPECT_EQ(map.u32, 3000000000U);
EXPECT_EQ(map.u16, 50000);
}
}
+struct StringTypes {
+ llvm::StringRef str1;
+ llvm::StringRef str2;
+ llvm::StringRef str3;
+ llvm::StringRef str4;
+ llvm::StringRef str5;
+ llvm::StringRef str6;
+ llvm::StringRef str7;
+ llvm::StringRef str8;
+ llvm::StringRef str9;
+ llvm::StringRef str10;
+ llvm::StringRef str11;
+ std::string stdstr1;
+ std::string stdstr2;
+ std::string stdstr3;
+ std::string stdstr4;
+ std::string stdstr5;
+ std::string stdstr6;
+ std::string stdstr7;
+ std::string stdstr8;
+ std::string stdstr9;
+ std::string stdstr10;
+ std::string stdstr11;
+};
+
+namespace llvm {
+namespace yaml {
+ template <>
+ struct MappingTraits<StringTypes> {
+ static void mapping(IO &io, StringTypes& st) {
+ io.mapRequired("str1", st.str1);
+ io.mapRequired("str2", st.str2);
+ io.mapRequired("str3", st.str3);
+ io.mapRequired("str4", st.str4);
+ io.mapRequired("str5", st.str5);
+ io.mapRequired("str6", st.str6);
+ io.mapRequired("str7", st.str7);
+ io.mapRequired("str8", st.str8);
+ io.mapRequired("str9", st.str9);
+ io.mapRequired("str10", st.str10);
+ io.mapRequired("str11", st.str11);
+ io.mapRequired("stdstr1", st.stdstr1);
+ io.mapRequired("stdstr2", st.stdstr2);
+ io.mapRequired("stdstr3", st.stdstr3);
+ io.mapRequired("stdstr4", st.stdstr4);
+ io.mapRequired("stdstr5", st.stdstr5);
+ io.mapRequired("stdstr6", st.stdstr6);
+ io.mapRequired("stdstr7", st.stdstr7);
+ io.mapRequired("stdstr8", st.stdstr8);
+ io.mapRequired("stdstr9", st.stdstr9);
+ io.mapRequired("stdstr10", st.stdstr10);
+ io.mapRequired("stdstr11", st.stdstr11);
+ }
+ };
+}
+}
+
+TEST(YAMLIO, TestReadWriteStringTypes) {
+ std::string intermediate;
+ {
+ StringTypes map;
+ map.str1 = "'aaa";
+ map.str2 = "\"bbb";
+ map.str3 = "`ccc";
+ map.str4 = "@ddd";
+ map.str5 = "";
+ map.str6 = "0000000004000000";
+ map.str7 = "true";
+ map.str8 = "FALSE";
+ map.str9 = "~";
+ map.str10 = "0.2e20";
+ map.str11 = "0x30";
+ map.stdstr1 = "'eee";
+ map.stdstr2 = "\"fff";
+ map.stdstr3 = "`ggg";
+ map.stdstr4 = "@hhh";
+ map.stdstr5 = "";
+ map.stdstr6 = "0000000004000000";
+ map.stdstr7 = "true";
+ map.stdstr8 = "FALSE";
+ map.stdstr9 = "~";
+ map.stdstr10 = "0.2e20";
+ map.stdstr11 = "0x30";
+
+ llvm::raw_string_ostream ostr(intermediate);
+ Output yout(ostr);
+ yout << map;
+ }
+
+ llvm::StringRef flowOut(intermediate);
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'''aaa"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'\"bbb'"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'`ccc'"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'@ddd'"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("''\n"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'0000000004000000'\n"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'true'\n"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'FALSE'\n"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'~'\n"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'0.2e20'\n"));
+ EXPECT_NE(llvm::StringRef::npos, flowOut.find("'0x30'\n"));
+ EXPECT_NE(std::string::npos, flowOut.find("'''eee"));
+ EXPECT_NE(std::string::npos, flowOut.find("'\"fff'"));
+ EXPECT_NE(std::string::npos, flowOut.find("'`ggg'"));
+ EXPECT_NE(std::string::npos, flowOut.find("'@hhh'"));
+ EXPECT_NE(std::string::npos, flowOut.find("''\n"));
+ EXPECT_NE(std::string::npos, flowOut.find("'0000000004000000'\n"));
+
+ {
+ Input yin(intermediate);
+ StringTypes map;
+ yin >> map;
+ EXPECT_FALSE(yin.error());
+ EXPECT_TRUE(map.str1.equals("'aaa"));
+ EXPECT_TRUE(map.str2.equals("\"bbb"));
+ EXPECT_TRUE(map.str3.equals("`ccc"));
+ EXPECT_TRUE(map.str4.equals("@ddd"));
+ EXPECT_TRUE(map.str5.equals(""));
+ EXPECT_TRUE(map.str6.equals("0000000004000000"));
+ EXPECT_TRUE(map.stdstr1 == "'eee");
+ EXPECT_TRUE(map.stdstr2 == "\"fff");
+ EXPECT_TRUE(map.stdstr3 == "`ggg");
+ EXPECT_TRUE(map.stdstr4 == "@hhh");
+ EXPECT_TRUE(map.stdstr5 == "");
+ EXPECT_TRUE(map.stdstr6 == "0000000004000000");
+ }
+}
//===----------------------------------------------------------------------===//
// Test ScalarEnumerationTraits
return "malformed by";
}
}
+ static bool mustQuote(StringRef) { return true; }
};
}
}
value = n;
return StringRef();
}
+
+ static bool mustQuote(StringRef) { return false; }
};
}
}
map.numbers.push_back(1024);
llvm::raw_string_ostream ostr(intermediate);
- Output yout(ostr);
+ Output yout(ostr);
yout << map;
-
+
// Verify sequences were written in flow style
ostr.flush();
llvm::StringRef flowOut(intermediate);
struct MappingTraits<KindAndFlags> {
static void mapping(IO &io, KindAndFlags& kf) {
io.mapRequired("kind", kf.kind);
- // type of flags field varies depending on kind field
-
+ // Type of "flags" field varies depending on "kind" field.
// Use memcpy here to avoid breaking strict aliasing rules.
- if ( kf.kind == kindA ) {
- AFlags aflags;
- memcpy(&aflags, &kf.flags, sizeof(aflags));
+ if (kf.kind == kindA) {
+ AFlags aflags = static_cast<AFlags>(kf.flags);
io.mapRequired("flags", aflags);
- }
- else {
- BFlags bflags;
- memcpy(&bflags, &kf.flags, sizeof(bflags));
+ kf.flags = aflags;
+ } else {
+ BFlags bflags = static_cast<BFlags>(kf.flags);
io.mapRequired("flags", bflags);
+ kf.flags = bflags;
}
}
};
}
}
+//===----------------------------------------------------------------------===//
+// Test document tags
+//===----------------------------------------------------------------------===//
+
+struct MyDouble {
+ MyDouble() : value(0.0) { }
+ MyDouble(double x) : value(x) { }
+ double value;
+};
+
+LLVM_YAML_IS_DOCUMENT_LIST_VECTOR(MyDouble)
+
+
+namespace llvm {
+namespace yaml {
+ template <>
+ struct MappingTraits<MyDouble> {
+ static void mapping(IO &io, MyDouble &d) {
+ if (io.mapTag("!decimal", true)) {
+ mappingDecimal(io, d);
+ } else if (io.mapTag("!fraction")) {
+ mappingFraction(io, d);
+ }
+ }
+ static void mappingDecimal(IO &io, MyDouble &d) {
+ io.mapRequired("value", d.value);
+ }
+ static void mappingFraction(IO &io, MyDouble &d) {
+ double num, denom;
+ io.mapRequired("numerator", num);
+ io.mapRequired("denominator", denom);
+ // convert fraction to double
+ d.value = num/denom;
+ }
+ };
+ }
+}
+
+
+//
+// Test the reading of two different tagged yaml documents.
+//
+TEST(YAMLIO, TestTaggedDocuments) {
+ std::vector<MyDouble> docList;
+ Input yin("--- !decimal\nvalue: 3.0\n"
+ "--- !fraction\nnumerator: 9.0\ndenominator: 2\n...\n");
+ yin >> docList;
+ EXPECT_FALSE(yin.error());
+ EXPECT_EQ(docList.size(), 2UL);
+ EXPECT_EQ(docList[0].value, 3.0);
+ EXPECT_EQ(docList[1].value, 4.5);
+}
+
+
+
+//
+// Test writing then reading back tagged documents
+//
+TEST(YAMLIO, TestTaggedDocumentsWriteAndRead) {
+ std::string intermediate;
+ {
+ MyDouble a(10.25);
+ MyDouble b(-3.75);
+ std::vector<MyDouble> docList;
+ docList.push_back(a);
+ docList.push_back(b);
+
+ llvm::raw_string_ostream ostr(intermediate);
+ Output yout(ostr);
+ yout << docList;
+ }
+
+ {
+ Input yin(intermediate);
+ std::vector<MyDouble> docList2;
+ yin >> docList2;
+
+ EXPECT_FALSE(yin.error());
+ EXPECT_EQ(docList2.size(), 2UL);
+ EXPECT_EQ(docList2[0].value, 10.25);
+ EXPECT_EQ(docList2[1].value, -3.75);
+ }
+}
+
//===----------------------------------------------------------------------===//
-// Test error handling
+// Test mapping validation
//===----------------------------------------------------------------------===//
+struct MyValidation {
+ double value;
+};
+LLVM_YAML_IS_DOCUMENT_LIST_VECTOR(MyValidation)
-static void suppressErrorMessages(const llvm::SMDiagnostic &, void *) {
+namespace llvm {
+namespace yaml {
+ template <>
+ struct MappingTraits<MyValidation> {
+ static void mapping(IO &io, MyValidation &d) {
+ io.mapRequired("value", d.value);
+ }
+ static StringRef validate(IO &io, MyValidation &d) {
+ if (d.value < 0)
+ return "negative value";
+ return StringRef();
+ }
+ };
+ }
+}
+
+
+//
+// Test that validate() is called and complains about the negative value.
+//
+TEST(YAMLIO, TestValidatingInput) {
+ std::vector<MyValidation> docList;
+ Input yin("--- \nvalue: 3.0\n"
+ "--- \nvalue: -1.0\n...\n",
+ nullptr, suppressErrorMessages);
+ yin >> docList;
+ EXPECT_TRUE(!!yin.error());
}
+//===----------------------------------------------------------------------===//
+// Test error handling
+//===----------------------------------------------------------------------===//
+
//
// Test error handling of unknown enumerated scalar
//
"c1: blue\n"
"c2: purple\n"
"c3: green\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> map;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"f1: [ big ]\n"
"f2: [ round, hollow ]\n"
"f3: []\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> map;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 255\n"
"- 0\n"
"- 257\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 65535\n"
"- 0\n"
"- 66000\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 4000000000\n"
"- 0\n"
"- 5000000000\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 18446744073709551615\n"
"- 0\n"
"- 19446744073709551615\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 0\n"
"- 127\n"
"- 128\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 0\n"
"- 127\n"
"- -129\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 0\n"
"- -32768\n"
"- -32769\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 0\n"
"- -32768\n"
"- 32768\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 0\n"
"- -2147483648\n"
"- -2147483649\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 0\n"
"- -2147483648\n"
"- 2147483649\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 0\n"
"- 9223372036854775807\n"
"- -9223372036854775809\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 0\n"
"- 9223372036854775807\n"
"- 9223372036854775809\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 1000.1\n"
"- -123.456\n"
"- 1.2.3\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 1000.1\n"
"- -123.456\n"
"- 1.2.3\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 0x12\n"
"- 0xFE\n"
"- 0x123\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
"- 0x0012\n"
"- 0xFEFF\n"
"- 0x12345\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 0x0012\n"
"- 0xFEFF0000\n"
"- 0x1234556789\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
}
//
"- 0x0012\n"
"- 0xFFEEDDCCBBAA9988\n"
"- 0x12345567890ABCDEF0\n"
- "...\n");
- yin.setDiagHandler(suppressErrorMessages);
+ "...\n",
+ /*Ctxt=*/nullptr,
+ suppressErrorMessages);
yin >> seq;
- EXPECT_TRUE(yin.error());
+ EXPECT_TRUE(!!yin.error());
+}
+
+TEST(YAMLIO, TestMalformedMapFailsGracefully) {
+ FooBar doc;
+ {
+ // We pass the suppressErrorMessages handler to handle the error
+ // message generated in the constructor of Input.
+ Input yin("{foo:3, bar: 5}", /*Ctxt=*/nullptr, suppressErrorMessages);
+ yin >> doc;
+ EXPECT_TRUE(!!yin.error());
+ }
+
+ {
+ Input yin("---\nfoo:3\nbar: 5\n...\n", /*Ctxt=*/nullptr, suppressErrorMessages);
+ yin >> doc;
+ EXPECT_TRUE(!!yin.error());
+ }
+}
+
+struct OptionalTest {
+ std::vector<int> Numbers;
+};
+
+struct OptionalTestSeq {
+ std::vector<OptionalTest> Tests;
+};
+
+LLVM_YAML_IS_SEQUENCE_VECTOR(OptionalTest)
+namespace llvm {
+namespace yaml {
+ template <>
+ struct MappingTraits<OptionalTest> {
+ static void mapping(IO& IO, OptionalTest &OT) {
+ IO.mapOptional("Numbers", OT.Numbers);
+ }
+ };
+
+ template <>
+ struct MappingTraits<OptionalTestSeq> {
+ static void mapping(IO &IO, OptionalTestSeq &OTS) {
+ IO.mapOptional("Tests", OTS.Tests);
+ }
+ };
}
+}
+
+TEST(YAMLIO, SequenceElideTest) {
+ // Test that writing out a purely optional structure with its fields set to
+ // default followed by other data is properly read back in.
+ OptionalTestSeq Seq;
+ OptionalTest One, Two, Three, Four;
+ int N[] = {1, 2, 3};
+ Three.Numbers.assign(N, N + 3);
+ Seq.Tests.push_back(One);
+ Seq.Tests.push_back(Two);
+ Seq.Tests.push_back(Three);
+ Seq.Tests.push_back(Four);
+ std::string intermediate;
+ {
+ llvm::raw_string_ostream ostr(intermediate);
+ Output yout(ostr);
+ yout << Seq;
+ }
+
+ Input yin(intermediate);
+ OptionalTestSeq Seq2;
+ yin >> Seq2;
+
+ EXPECT_FALSE(yin.error());
+
+ EXPECT_EQ(4UL, Seq2.Tests.size());
+
+ EXPECT_TRUE(Seq2.Tests[0].Numbers.empty());
+ EXPECT_TRUE(Seq2.Tests[1].Numbers.empty());
+
+ EXPECT_EQ(1, Seq2.Tests[2].Numbers[0]);
+ EXPECT_EQ(2, Seq2.Tests[2].Numbers[1]);
+ EXPECT_EQ(3, Seq2.Tests[2].Numbers[2]);
+
+ EXPECT_TRUE(Seq2.Tests[3].Numbers.empty());
+}
+
+TEST(YAMLIO, TestEmptyStringFailsForMapWithRequiredFields) {
+ FooBar doc;
+ Input yin("");
+ yin >> doc;
+ EXPECT_TRUE(!!yin.error());
+}
+
+TEST(YAMLIO, TestEmptyStringSucceedsForMapWithOptionalFields) {
+ OptionalTest doc;
+ Input yin("");
+ yin >> doc;
+ EXPECT_FALSE(yin.error());
+}
+
+TEST(YAMLIO, TestEmptyStringSucceedsForSequence) {
+ std::vector<uint8_t> seq;
+ Input yin("", /*Ctxt=*/nullptr, suppressErrorMessages);
+ yin >> seq;
+
+ EXPECT_FALSE(yin.error());
+ EXPECT_TRUE(seq.empty());
+}
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