/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
// @author Kristina Holst (kholst@fb.com)
// @author Andrei Alexandrescu (andrei.alexandrescu@fb.com)
-#include "folly/Range.h"
+#include <folly/Range.h>
+#include <folly/portability/GTest.h>
+#include <folly/portability/Memory.h>
+#include <folly/portability/SysMman.h>
+
+#include <array>
+#include <iterator>
#include <limits>
-#include <cstdlib>
+#include <random>
#include <string>
-#include <iterator>
-#include <sys/mman.h>
+#include <type_traits>
+#include <vector>
#include <boost/range/concepts.hpp>
-#include <gtest/gtest.h>
-
-namespace folly { namespace detail {
-
-// declaration of functions in Range.cpp
-size_t qfind_first_byte_of_memchr(const StringPiece& haystack,
- const StringPiece& needles);
-
-size_t qfind_first_byte_of_byteset(const StringPiece& haystack,
- const StringPiece& needles);
-
-}} // namespaces
+#include <boost/algorithm/string/trim.hpp>
using namespace folly;
+using namespace folly::detail;
using namespace std;
+static_assert(std::is_literal_type<StringPiece>::value, "");
+
BOOST_CONCEPT_ASSERT((boost::RandomAccessRangeConcept<StringPiece>));
TEST(StringPiece, All) {
EXPECT_EQ(s.find('y'), StringPiece::npos);
EXPECT_EQ(s.find('y', 1), StringPiece::npos);
EXPECT_EQ(s.find('o', 4), StringPiece::npos); // starting position too far
+ EXPECT_TRUE(s.contains('z'));
// starting pos that is obviously past the end -- This works for std::string
EXPECT_EQ(s.toString().find('y', 55), StringPiece::npos);
EXPECT_EQ(s.find('z', s.size()), StringPiece::npos);
// null char
EXPECT_EQ(s.find('\0'), std::string().find('\0'));
EXPECT_EQ(s.find('\0'), StringPiece::npos);
+ EXPECT_FALSE(s.contains('\0'));
// single char rfinds
EXPECT_EQ(s.rfind('b'), 6);
EXPECT_EQ(s.find_first_of("bar"), 3);
EXPECT_EQ(s.find_first_of("ba", 3), 3);
EXPECT_EQ(s.find_first_of("ba", 4), 4);
+ EXPECT_TRUE(s.contains("bar"));
EXPECT_EQ(s.find_first_of("xyxy"), StringPiece::npos);
EXPECT_EQ(s.find_first_of("xyxy", 1), StringPiece::npos);
+ EXPECT_FALSE(s.contains("xyxy"));
// starting position too far
EXPECT_EQ(s.find_first_of("foo", 4), StringPiece::npos);
// starting pos that is obviously past the end -- This works for std::string
EXPECT_THROW(a.subpiece(6), std::out_of_range);
}
-#if FOLLY_HAVE_CONSTEXPR_STRLEN
-constexpr char helloArray[] = "hello";
-
TEST(StringPiece, Constexpr) {
+ constexpr const char* helloArray = "hello";
+
constexpr StringPiece hello1("hello");
EXPECT_EQ("hello", hello1);
+ static_assert(hello1.size() == 5, "hello size should be 5 at compile time");
constexpr StringPiece hello2(helloArray);
EXPECT_EQ("hello", hello2);
+ static_assert(hello2.size() == 5, "hello size should be 5 at compile time");
}
-#endif
TEST(StringPiece, Prefix) {
StringPiece a("hello");
EXPECT_FALSE(a.startsWith('x'));
EXPECT_FALSE(a.startsWith("x"));
+ EXPECT_TRUE(a.startsWith("", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.startsWith("hello", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.startsWith("hellO", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.startsWith("HELL", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.startsWith("H", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.startsWith("HELLOX", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.startsWith("x", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.startsWith("X", folly::AsciiCaseInsensitive()));
+
{
auto b = a;
EXPECT_TRUE(b.removePrefix(""));
EXPECT_FALSE(a.endsWith("x"));
EXPECT_FALSE(a.endsWith('x'));
+ EXPECT_TRUE(a.endsWith("", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.endsWith("o", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.endsWith("O", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.endsWith("hello", folly::AsciiCaseInsensitive()));
+ EXPECT_TRUE(a.endsWith("hellO", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.endsWith("xhello", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.endsWith("Xhello", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.endsWith("x", folly::AsciiCaseInsensitive()));
+ EXPECT_FALSE(a.endsWith("X", folly::AsciiCaseInsensitive()));
+
{
auto b = a;
EXPECT_TRUE(b.removeSuffix(""));
EXPECT_EQ("", a);
}
+TEST(StringPiece, erase) {
+ StringPiece a("hello");
+ auto b = a.begin();
+ auto e = b + 1;
+ a.erase(b, e);
+ EXPECT_EQ("ello", a);
+
+ e = a.end();
+ b = e - 1;
+ a.erase(b, e);
+ EXPECT_EQ("ell", a);
+
+ b = a.end() - 1;
+ e = a.end() - 1;
+ EXPECT_THROW(a.erase(b, e), std::out_of_range);
+
+ b = a.begin();
+ e = a.end();
+ a.erase(b, e);
+ EXPECT_EQ("", a);
+
+ a = "hello";
+ b = a.begin();
+ e = b + 2;
+ a.erase(b, e);
+ EXPECT_EQ("llo", a);
+
+ b = a.end() - 2;
+ e = a.end();
+ a.erase(b, e);
+ EXPECT_EQ("l", a);
+
+ a = " hello ";
+ boost::algorithm::trim(a);
+ EXPECT_EQ(a, "hello");
+}
+
TEST(StringPiece, split_step_char_delimiter) {
// 0 1 2
// 012345678901234567890123456
folly::StringPiece p(s);
EXPECT_EQ(s, p.begin());
EXPECT_EQ(e, p.end());
+ EXPECT_EQ(s, p);
auto x = p.split_step(' ');
EXPECT_EQ(std::next(s, 5), p.begin());
folly::StringPiece p(s);
EXPECT_EQ(s, p.begin());
EXPECT_EQ(e, p.end());
+ EXPECT_EQ(s, p);
auto x = p.split_step(" ");
EXPECT_EQ(std::next(s, 6), p.begin());
folly::StringPiece p(s);
EXPECT_EQ(s, p.begin());
EXPECT_EQ(e, p.end());
+ EXPECT_EQ(s, p);
EXPECT_EQ(1, (p.split_step(' ', [&](folly::StringPiece x) {
EXPECT_EQ(std::next(s, 5), p.begin());
folly::StringPiece p(s);
EXPECT_EQ(s, p.begin());
EXPECT_EQ(e, p.end());
+ EXPECT_EQ(s, p);
EXPECT_EQ(1, (p.split_step(" ", [&](folly::StringPiece x) {
EXPECT_EQ(std::next(s, 6), p.begin());
EXPECT_NO_THROW(p.split_step(' ', split_step_with_process_noop));
}
+TEST(StringPiece, split_step_with_process_char_delimiter_additional_args) {
+ // 0 1 2
+ // 012345678901234567890123456
+ auto const s = "this is just a test string";
+ auto const e = std::next(s, std::strlen(s));
+ auto const delimiter = ' ';
+ EXPECT_EQ('\0', *e);
+
+ folly::StringPiece p(s);
+ EXPECT_EQ(s, p.begin());
+ EXPECT_EQ(e, p.end());
+ EXPECT_EQ(s, p);
+
+ auto const functor = [](
+ folly::StringPiece s,
+ folly::StringPiece expected
+ ) {
+ EXPECT_EQ(expected, s);
+ return expected;
+ };
+
+ auto const checker = [&](folly::StringPiece expected) {
+ EXPECT_EQ(expected, p.split_step(delimiter, functor, expected));
+ };
+
+ checker("this");
+ checker("is");
+ checker("just");
+ checker("");
+ checker("a");
+ checker("test");
+ checker("string");
+ checker("");
+ checker("");
+
+ EXPECT_TRUE(p.empty());
+}
+
+TEST(StringPiece, split_step_with_process_range_delimiter_additional_args) {
+ // 0 1 2 3
+ // 0123456789012345678901234567890123
+ auto const s = "this is just a test string";
+ auto const e = std::next(s, std::strlen(s));
+ auto const delimiter = " ";
+ EXPECT_EQ('\0', *e);
+
+ folly::StringPiece p(s);
+ EXPECT_EQ(s, p.begin());
+ EXPECT_EQ(e, p.end());
+ EXPECT_EQ(s, p);
+
+ auto const functor = [](
+ folly::StringPiece s,
+ folly::StringPiece expected
+ ) {
+ EXPECT_EQ(expected, s);
+ return expected;
+ };
+
+ auto const checker = [&](folly::StringPiece expected) {
+ EXPECT_EQ(expected, p.split_step(delimiter, functor, expected));
+ };
+
+ checker("this");
+ checker("is");
+ checker("just");
+ checker("");
+ checker("a");
+ checker(" test");
+ checker("string");
+ checker("");
+ checker("");
+
+ EXPECT_TRUE(p.empty());
+}
+
+TEST(StringPiece, NoInvalidImplicitConversions) {
+ struct IsString {
+ bool operator()(folly::Range<int*>) { return false; }
+ bool operator()(folly::StringPiece) { return true; }
+ };
+
+ std::string s = "hello";
+ EXPECT_TRUE(IsString()(s));
+}
+
TEST(qfind, UInt32_Ranges) {
vector<uint32_t> a({1, 2, 3, 260, 5});
vector<uint32_t> b({2, 3, 4});
}
};
-struct MemchrNeedleFinder {
- static size_t find_first_byte_of(StringPiece haystack, StringPiece needles) {
- return detail::qfind_first_byte_of_memchr(haystack, needles);
- }
-};
-
struct ByteSetNeedleFinder {
static size_t find_first_byte_of(StringPiece haystack, StringPiece needles) {
return detail::qfind_first_byte_of_byteset(haystack, needles);
}
};
-typedef ::testing::Types<SseNeedleFinder, NoSseNeedleFinder, MemchrNeedleFinder,
+typedef ::testing::Types<SseNeedleFinder,
+ NoSseNeedleFinder,
ByteSetNeedleFinder> NeedleFinders;
TYPED_TEST_CASE(NeedleFinderTest, NeedleFinders);
TYPED_TEST(NeedleFinderTest, Unaligned) {
// works correctly even if input buffers are not 16-byte aligned
string s = "0123456789ABCDEFGH";
- for (int i = 0; i < s.size(); ++i) {
+ for (size_t i = 0; i < s.size(); ++i) {
StringPiece a(s.c_str() + i);
- for (int j = 0; j < s.size(); ++j) {
+ for (size_t j = 0; j < s.size(); ++j) {
StringPiece b(s.c_str() + j);
EXPECT_EQ((i > j) ? 0 : j - i, this->find_first_byte_of(a, b));
}
const auto maxValue = std::numeric_limits<StringPiece::value_type>::max();
// make the size ~big to avoid any edge-case branches for tiny haystacks
const int haystackSize = 50;
- for (int i = minValue; i <= maxValue; i++) { // <=
+ for (int i = minValue; i <= maxValue; i++) { // <=
needles.push_back(i);
}
EXPECT_EQ(StringPiece::npos, this->find_first_byte_of("", needles));
}
TYPED_TEST(NeedleFinderTest, Base) {
- for (int i = 0; i < 32; ++i) {
+ for (size_t i = 0; i < 32; ++i) {
for (int j = 0; j < 32; ++j) {
string s = string(i, 'X') + "abca" + string(i, 'X');
string delims = string(j, 'Y') + "a" + string(j, 'Y');
void createProtectedBuf(StringPiece& contents, char** buf) {
ASSERT_LE(contents.size(), kPageSize);
const size_t kSuccess = 0;
- if (kSuccess != posix_memalign((void**)buf, kPageSize, 4 * kPageSize)) {
+ char* pageAlignedBuf = (char*)aligned_malloc(2 * kPageSize, kPageSize);
+ if (pageAlignedBuf == nullptr) {
ASSERT_FALSE(true);
}
- mprotect(*buf + kPageSize, kPageSize, PROT_NONE);
+ // Protect the page after the first full page-aligned region of the
+ // malloc'ed buffer
+ mprotect(pageAlignedBuf + kPageSize, kPageSize, PROT_NONE);
size_t newBegin = kPageSize - contents.size();
- memcpy(*buf + newBegin, contents.data(), contents.size());
- contents.reset(*buf + newBegin, contents.size());
+ memcpy(pageAlignedBuf + newBegin, contents.data(), contents.size());
+ contents.reset(pageAlignedBuf + newBegin, contents.size());
+ *buf = pageAlignedBuf;
}
void freeProtectedBuf(char* buf) {
mprotect(buf + kPageSize, kPageSize, PROT_READ | PROT_WRITE);
- free(buf);
+ aligned_free(buf);
}
TYPED_TEST(NeedleFinderTest, NoSegFault) {
}
}
+TEST(NonConstTest, StringPiece) {
+ std::string hello("hello");
+ MutableStringPiece sp(&hello.front(), hello.size());
+ sp[0] = 'x';
+ EXPECT_EQ("xello", hello);
+ {
+ StringPiece s(sp);
+ EXPECT_EQ("xello", s);
+ }
+ {
+ ByteRange r1(sp);
+ MutableByteRange r2(sp);
+ }
+}
+
+// Similar to the begin() template functions, but instread of returing
+// an iterator, return a pointer to data.
+template <class Container>
+typename Container::value_type* dataPtr(Container& cont) {
+ // NOTE: &cont[0] is undefined if cont is empty (it creates a
+ // reference to nullptr - which is not dereferenced, but still UBSAN).
+ return cont.data();
+}
+template <class T, size_t N>
+constexpr T* dataPtr(T (&arr)[N]) noexcept {
+ return &arr[0];
+}
+
+template<class C>
+void testRangeFunc(C&& x, size_t n) {
+ const auto& cx = x;
+ // type, conversion checks
+ Range<int*> r1 = range(std::forward<C>(x));
+ Range<const int*> r2 = range(std::forward<C>(x));
+ Range<const int*> r3 = range(cx);
+ Range<const int*> r5 = range(std::move(cx));
+ EXPECT_EQ(r1.begin(), dataPtr(x));
+ EXPECT_EQ(r1.end(), dataPtr(x) + n);
+ EXPECT_EQ(n, r1.size());
+ EXPECT_EQ(n, r2.size());
+ EXPECT_EQ(n, r3.size());
+ EXPECT_EQ(n, r5.size());
+}
+
+TEST(RangeFunc, Vector) {
+ std::vector<int> x;
+ testRangeFunc(x, 0);
+ x.push_back(2);
+ testRangeFunc(x, 1);
+ testRangeFunc(std::vector<int>{1, 2}, 2);
+}
+
+TEST(RangeFunc, Array) {
+ std::array<int, 3> x;
+ testRangeFunc(x, 3);
+}
+
+// MSVC doesn't like it when you try to std::move C arrays:
+// https://developercommunity.visualstudio.com/content/problem/2441/
+#ifndef _MSC_VER
+TEST(RangeFunc, CArray) {
+ int x[] {1, 2, 3, 4};
+ testRangeFunc(x, 4);
+}
+#endif
+
+TEST(RangeFunc, ConstexprCArray) {
+ static constexpr const int numArray[4] = {3, 17, 1, 9};
+ constexpr const auto numArrayRange = range(numArray);
+ EXPECT_EQ(17, numArrayRange[1]);
+ constexpr const auto numArrayRangeSize = numArrayRange.size();
+ EXPECT_EQ(4, numArrayRangeSize);
+}
+
+TEST(RangeFunc, ConstexprStdArray) {
+ static constexpr const std::array<int, 4> numArray = {{3, 17, 1, 9}};
+ constexpr const auto numArrayRange = range(numArray);
+ EXPECT_EQ(17, numArrayRange[1]);
+ // MSVC 2017 RC and earlier have an issue that causes the beginning and
+ // end of numArrayRange to point to different copies of numArray, causing
+ // this attempt to calculate the size to error at compile time because
+ // they don't point to parts of the same array :(
+ // https://developercommunity.visualstudio.com/content/problem/3216/
+#if !defined(_MSC_VER) || _MSC_VER > 191024629
+ constexpr const auto numArrayRangeSize = numArrayRange.size();
+ EXPECT_EQ(4, numArrayRangeSize);
+#endif
+}
+
+TEST(RangeFunc, ConstexprStdArrayZero) {
+ static constexpr const std::array<int, 0> numArray = {};
+ constexpr const auto numArrayRange = range(numArray);
+ constexpr const auto numArrayRangeSize = numArrayRange.size();
+ EXPECT_EQ(0, numArrayRangeSize);
+}
+
+TEST(RangeFunc, ConstexprIteratorPair) {
+ static constexpr const int numArray[4] = {3, 17, 1, 9};
+ constexpr const auto numPtr = static_cast<const int*>(numArray);
+ constexpr const auto numIterRange = range(numPtr + 1, numPtr + 3);
+ EXPECT_EQ(1, numIterRange[1]);
+ constexpr const auto numIterRangeSize = numIterRange.size();
+ EXPECT_EQ(2, numIterRangeSize);
+}
+
+TEST(RangeFunc, ConstexprCollection) {
+ class IntCollection {
+ public:
+ constexpr IntCollection(const int* d, size_t s) : data_(d), size_(s) {}
+ constexpr const int* data() const {
+ return data_;
+ }
+ constexpr size_t size() const {
+ return size_;
+ }
+
+ private:
+ const int* data_;
+ size_t size_;
+ };
+ static constexpr const int numArray[4] = {3, 17, 1, 9};
+ constexpr const auto numPtr = static_cast<const int*>(numArray);
+ constexpr const auto numColl = IntCollection(numPtr + 1, 2);
+ constexpr const auto numCollRange = range(numColl);
+ EXPECT_EQ(1, numCollRange[1]);
+ constexpr const auto numCollRangeSize = numCollRange.size();
+ EXPECT_EQ(2, numCollRangeSize);
+}
+
+std::string get_rand_str(size_t size,
+ std::uniform_int_distribution<>& dist,
+ std::mt19937& gen) {
+ std::string ret(size, '\0');
+ for (size_t i = 0; i < size; ++i) {
+ ret[i] = static_cast<char>(dist(gen));
+ }
+
+ return ret;
+}
+
+namespace folly {
+bool operator==(MutableStringPiece mp, StringPiece sp) {
+ return mp.compare(sp) == 0;
+}
+
+bool operator==(StringPiece sp, MutableStringPiece mp) {
+ return mp.compare(sp) == 0;
+}
+}
+
+TEST(ReplaceAt, exhaustiveTest) {
+ char input[] = "this is nice and long input";
+ auto msp = MutableStringPiece(input);
+ auto str = std::string(input);
+ std::random_device rd;
+ std::mt19937 gen(rd());
+ std::uniform_int_distribution<> dist('a', 'z');
+
+ for (int i=0; i < 100; ++i) {
+ for (size_t j = 1; j <= msp.size(); ++j) {
+ auto replacement = get_rand_str(j, dist, gen);
+ for (size_t pos = 0; pos < msp.size() - j; ++pos) {
+ msp.replaceAt(pos, replacement);
+ str.replace(pos, replacement.size(), replacement);
+ EXPECT_EQ(msp.compare(str), 0);
+ }
+ }
+ }
+
+ // too far
+ EXPECT_EQ(msp.replaceAt(msp.size() - 2, StringPiece("meh")), false);
+}
+
+TEST(ReplaceAll, basicTest) {
+ char input[] = "this is nice and long input";
+ auto orig = std::string(input);
+ auto msp = MutableStringPiece(input);
+
+ EXPECT_EQ(msp.replaceAll("is", "si"), 2);
+ EXPECT_EQ("thsi si nice and long input", msp);
+ EXPECT_EQ(msp.replaceAll("si", "is"), 2);
+ EXPECT_EQ(msp, orig);
+
+ EXPECT_EQ(msp.replaceAll("abcd", "efgh"), 0); // nothing to replace
+ EXPECT_EQ(msp, orig);
+
+ // at the very beginning
+ EXPECT_EQ(msp.replaceAll("this", "siht"), 1);
+ EXPECT_EQ("siht is nice and long input", msp);
+ EXPECT_EQ(msp.replaceAll("siht", "this"), 1);
+ EXPECT_EQ(msp, orig);
+
+ // at the very end
+ EXPECT_EQ(msp.replaceAll("input", "soput"), 1);
+ EXPECT_EQ("this is nice and long soput", msp);
+ EXPECT_EQ(msp.replaceAll("soput", "input"), 1);
+ EXPECT_EQ(msp, orig);
+
+ // all spaces
+ EXPECT_EQ(msp.replaceAll(" ", "@"), 5);
+ EXPECT_EQ("this@is@nice@and@long@input", msp);
+ EXPECT_EQ(msp.replaceAll("@", " "), 5);
+ EXPECT_EQ(msp, orig);
+}
+
+TEST(ReplaceAll, randomTest) {
+ char input[] = "abcdefghijklmnoprstuwqz"; // no pattern repeata inside
+ auto orig = std::string(input);
+ auto msp = MutableStringPiece(input);
+
+ std::random_device rd;
+ std::mt19937 gen(rd());
+ std::uniform_int_distribution<> dist('A', 'Z');
+
+ for (int i=0; i < 100; ++i) {
+ for (size_t j = 1; j <= orig.size(); ++j) {
+ auto replacement = get_rand_str(j, dist, gen);
+ for (size_t pos = 0; pos < msp.size() - j; ++pos) {
+ auto piece = orig.substr(pos, j);
+ EXPECT_EQ(msp.replaceAll(piece, replacement), 1);
+ EXPECT_EQ(msp.find(replacement), pos);
+ EXPECT_EQ(msp.replaceAll(replacement, piece), 1);
+ EXPECT_EQ(msp, orig);
+ }
+ }
+ }
+}
+
+TEST(ReplaceAll, BadArg) {
+ int count = 0;
+ auto fst = "longer";
+ auto snd = "small";
+ char input[] = "meh meh meh";
+ auto all = MutableStringPiece(input);
+
+ try {
+ all.replaceAll(fst, snd);
+ } catch (std::invalid_argument&) {
+ ++count;
+ }
+
+ try {
+ all.replaceAll(snd, fst);
+ } catch (std::invalid_argument&) {
+ ++count;
+ }
+
+ EXPECT_EQ(count, 2);
+}
+
+TEST(Range, Constructors) {
+ vector<int> c = {1, 2, 3};
+ typedef Range<vector<int>::iterator> RangeType;
+ typedef Range<vector<int>::const_iterator> ConstRangeType;
+ RangeType cr(c.begin(), c.end());
+ auto subpiece1 = ConstRangeType(cr, 1, 5);
+ auto subpiece2 = ConstRangeType(cr, 1);
+ EXPECT_EQ(subpiece1.size(), 2);
+ EXPECT_EQ(subpiece1.begin(), subpiece2.begin());
+ EXPECT_EQ(subpiece1.end(), subpiece2.end());
+}
+
+TEST(Range, ArrayConstructors) {
+ auto charArray = std::array<char, 4>{{'t', 'e', 's', 't'}};
+ auto constCharArray = std::array<char, 6>{{'f', 'o', 'o', 'b', 'a', 'r'}};
+ auto emptyArray = std::array<char, 0>{};
+
+ auto sp1 = StringPiece{charArray};
+ EXPECT_EQ(4, sp1.size());
+ EXPECT_EQ(charArray.data(), sp1.data());
+
+ auto sp2 = StringPiece(constCharArray);
+ EXPECT_EQ(6, sp2.size());
+ EXPECT_EQ(constCharArray.data(), sp2.data());
+
+ auto msp = MutableStringPiece(charArray);
+ EXPECT_EQ(4, msp.size());
+ EXPECT_EQ(charArray.data(), msp.data());
+
+ auto esp = StringPiece(emptyArray);
+ EXPECT_EQ(0, esp.size());
+ EXPECT_EQ(nullptr, esp.data());
+
+ auto emsp = MutableStringPiece(emptyArray);
+ EXPECT_EQ(0, emsp.size());
+ EXPECT_EQ(nullptr, emsp.data());
+
+ static constexpr std::array<int, 4> numArray = {{3, 17, 1, 9}};
+ constexpr auto numRange = Range<const int*>{numArray};
+ EXPECT_EQ(17, numRange[1]);
+
+ static constexpr std::array<int, 0> emptyNumArray{};
+ constexpr auto emptyNumRange = Range<const int*>{emptyNumArray};
+ EXPECT_EQ(0, emptyNumRange.size());
+}
+
+TEST(Range, ConstexprAccessors) {
+ constexpr StringPiece piece = range("hello");
+ static_assert(piece.size() == 6u, "");
+ static_assert(piece.end() - piece.begin() == 6u, "");
+ static_assert(piece.data() == piece.begin(), "");
+ static_assert(piece.start() == piece.begin(), "");
+ static_assert(piece.cbegin() == piece.begin(), "");
+ static_assert(piece.cend() == piece.end(), "");
+ static_assert(*piece.begin() == 'h', "");
+ static_assert(*(piece.end() - 1) == '\0', "");
+}