test/std/input.output/filesystems/class.path/path.member/path.concat.pass.cpp - llvm-project/libcxx - Git at Google

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//

 // UNSUPPORTED: c++03

 // These tests require locale for non-char paths
 // UNSUPPORTED: libcpp-has-no-localization

 // <filesystem>

 // class path

 // path& operator+=(const path& x);
 // path& operator+=(const string_type& x);
 // path& operator+=(string_view x);
 // path& operator+=(const value_type* x);
 // path& operator+=(value_type x);
 // template <class Source>
 //   path& operator+=(const Source& x);
 // template <class EcharT>
 //   path& operator+=(EcharT x);
 // template <class Source>
 //   path& concat(const Source& x);
 // template <class InputIterator>
 //   path& concat(InputIterator first, InputIterator last);


 #include "filesystem_include.h"
 #include <type_traits>
 #include <string>
 #include <string_view>
 #include <cassert>

 // On Windows, charset conversions cause allocations in the path class in
 // cases where no allocations are done on other platforms.

 #include "test_macros.h"
 #include "test_iterators.h"
 #include "count_new.h"
 #include "filesystem_test_helper.h"


 struct ConcatOperatorTestcase {
   MultiStringType lhs;
   MultiStringType rhs;
   MultiStringType expect;
 };

 #define LONGSTR "LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR"
 #define S(Str) MKSTR(Str)
 const ConcatOperatorTestcase Cases[] =
     {
         {S(""),         S(""),                  S("")}
       , {S("p1"),       S("p2"),                S("p1p2")}
       , {S("p1/"),      S("/p2"),               S("p1//p2")}
       , {S(""),         S("\\foo/bar/baz"),     S("\\foo/bar/baz")}
       , {S("c:\\foo"),  S(""),                  S("c:\\foo")}
       , {S(LONGSTR),    S("foo"),               S(LONGSTR "foo")}
       , {S("abcdefghijklmnopqrstuvwxyz/\\"), S("/\\123456789"), S("abcdefghijklmnopqrstuvwxyz/\\/\\123456789")}
     };
 const ConcatOperatorTestcase LongLHSCases[] =
     {
         {S(""),        S(LONGSTR),     S(LONGSTR)}
       , {S("p1/"),     S(LONGSTR),      S("p1/" LONGSTR)}
     };
 const ConcatOperatorTestcase CharTestCases[] =
     {
         {S(""),       S("P"), S("P")}
       , {S("/fooba"), S("r"), S("/foobar")}
     };
 #undef S
 #undef LONGSTR

 // The concat operator may need to allocate a temporary buffer before a code_cvt
 // conversion. Test if this allocation occurs by:
 //   1. Create a path, `LHS`, and reserve enough space to append `RHS`.
 //      This prevents `LHS` from allocating during the actual appending.
 //   2. Create a `Source` object `RHS`, which represents a "large" string.
 //      (The string must not trigger the SSO)
 //   3. Concat `RHS` to `LHS` and check for the expected allocation behavior.
 template <class CharT>
 void doConcatSourceAllocTest(ConcatOperatorTestcase const& TC)
 {
   using namespace fs;
   using Ptr = CharT const*;
   using Str = std::basic_string<CharT>;
   using StrView = std::basic_string_view<CharT>;
   using InputIter = cpp17_input_iterator<Ptr>;

   const Ptr L = TC.lhs;
   const Ptr R = TC.rhs;
   const Ptr E =  TC.expect;
   std::size_t ReserveSize = StrLen(E) + 1;
   // basic_string
   {
     path LHS(L); PathReserve(LHS, ReserveSize);
     Str  RHS(R);
     {
       TEST_NOT_WIN32(DisableAllocationGuard g);
       LHS += RHS;
     }
     assert(LHS == E);
   }
   // basic_string_view
   {
     path LHS(L); PathReserve(LHS, ReserveSize);
     StrView  RHS(R);
     {
       TEST_NOT_WIN32(DisableAllocationGuard g);
       LHS += RHS;
     }
     assert(LHS == E);
   }
   // CharT*
   {
     path LHS(L); PathReserve(LHS, ReserveSize);
     Ptr RHS(R);
     {
       TEST_NOT_WIN32(DisableAllocationGuard g);
       LHS += RHS;
     }
     assert(LHS == E);
   }
   {
     path LHS(L); PathReserve(LHS, ReserveSize);
     Ptr RHS(R);
     {
       TEST_NOT_WIN32(DisableAllocationGuard g);
       LHS.concat(RHS, StrEnd(RHS));
     }
     assert(LHS == E);
   }
   // input iterator - For non-native char types, appends needs to copy the
   // iterator range into a contiguous block of memory before it can perform the
   // code_cvt conversions.
   // For the path native type, no allocations will be performed because no
   // conversion is required.

 #if TEST_SUPPORTS_LIBRARY_INTERNAL_ALLOCATIONS
   // Only check allocations if we can pick up allocations done within the
   // library implementation.
   bool ExpectNoAllocations = std::is_same<CharT, path::value_type>::value;
 #endif
   {
     path LHS(L); PathReserve(LHS, ReserveSize);
     InputIter RHS(R);
     {
       RequireAllocationGuard g(0); // require "at least zero" allocations by default
 #if TEST_SUPPORTS_LIBRARY_INTERNAL_ALLOCATIONS
       if (ExpectNoAllocations)
         g.requireExactly(0);
 #endif
       LHS += RHS;
     }
     assert(LHS == E);
   }
   {
     path LHS(L); PathReserve(LHS, ReserveSize);
     InputIter RHS(R);
     InputIter REnd(StrEnd(R));
     {
       RequireAllocationGuard g(0); // require "at least zero" allocations by default
 #if TEST_SUPPORTS_LIBRARY_INTERNAL_ALLOCATIONS
       if (ExpectNoAllocations)
         g.requireExactly(0);
 #endif
       LHS.concat(RHS, REnd);
     }
     assert(LHS == E);
   }
 }

 template <class CharT>
 void doConcatSourceTest(ConcatOperatorTestcase const& TC)
 {
   using namespace fs;
   using Ptr = CharT const*;
   using Str = std::basic_string<CharT>;
   using StrView = std::basic_string_view<CharT>;
   using InputIter = cpp17_input_iterator<Ptr>;
   const Ptr L = TC.lhs;
   const Ptr R = TC.rhs;
   const Ptr E = TC.expect;
   // basic_string
   {
     path LHS(L);
     Str RHS(R);
     path& Ref = (LHS += RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   {
     path LHS(L);
     Str RHS(R);
     path& Ref = LHS.concat(RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   // basic_string_view
   {
     path LHS(L);
     StrView RHS(R);
     path& Ref = (LHS += RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   {
     path LHS(L);
     StrView RHS(R);
     path& Ref = LHS.concat(RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   // Char*
   {
     path LHS(L);
     Str RHS(R);
     path& Ref = (LHS += RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   {
     path LHS(L);
     Ptr RHS(R);
     path& Ref = LHS.concat(RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   {
     path LHS(L);
     Ptr RHS(R);
     path& Ref = LHS.concat(RHS, StrEnd(RHS));
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   // iterators
   {
     path LHS(L);
     InputIter RHS(R);
     path& Ref = (LHS += RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   {
     path LHS(L); InputIter RHS(R);
     path& Ref = LHS.concat(RHS);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
   {
     path LHS(L);
     InputIter RHS(R);
     InputIter REnd(StrEnd(R));
     path& Ref = LHS.concat(RHS, REnd);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
 }

 template <class CharT>
 void doConcatECharTest(ConcatOperatorTestcase const& TC)
 {
   using namespace fs;
   using Ptr = CharT const*;
   const Ptr RStr = TC.rhs;
   assert(StrLen(RStr) == 1);
   const Ptr L   = TC.lhs;
   const CharT R = RStr[0];
   const Ptr E   = TC.expect;
   {
     path LHS(L);
     path& Ref = (LHS += R);
     assert(LHS == E);
     assert(&Ref == &LHS);
   }
 }


 template <class It, class = decltype(fs::path{}.concat(std::declval<It>()))>
 constexpr bool has_concat(int) { return true; }
 template <class It>
 constexpr bool has_concat(long) { return false; }

 template <class It, class = decltype(fs::path{}.operator+=(std::declval<It>()))>
 constexpr bool has_concat_op(int) { return true; }
 template <class It>
 constexpr bool has_concat_op(long) { return false; }
 template <class It>
 constexpr bool has_concat_op() { return has_concat_op<It>(0); }

 template <class It>
 constexpr bool has_concat() {
   static_assert(has_concat<It>(0) == has_concat_op<It>(0), "must be same");
   return has_concat<It>(0) && has_concat_op<It>(0);
 }

 void test_sfinae() {
   using namespace fs;
   {
     static_assert(has_concat_op<char>(), "");
     static_assert(has_concat_op<const char>(), "");
     static_assert(has_concat_op<char16_t>(), "");
     static_assert(has_concat_op<const char16_t>(), "");
   }
   {
     using It = const char* const;
     static_assert(has_concat<It>(), "");
   }
   {
     using It = cpp17_input_iterator<const char*>;
     static_assert(has_concat<It>(), "");
   }
   {
     struct Traits {
       using iterator_category = std::input_iterator_tag;
       using value_type = const char;
       using pointer = const char*;
       using reference = const char&;
       using difference_type = std::ptrdiff_t;
     };
     using It = cpp17_input_iterator<const char*, Traits>;
     static_assert(has_concat<It>(), "");
   }
   {
     using It = output_iterator<const char*>;
     static_assert(!has_concat<It>(), "");
   }
   {
     static_assert(!has_concat<int>(0), "");
     // operator+=(int) is well formed since it converts to operator+=(value_type)
     // but concat(int) isn't valid because there is no concat(value_type).
     // This should probably be addressed by a LWG issue.
     static_assert(has_concat_op<int>(), "");
   }
   {
     static_assert(!has_concat<int*>(), "");
   }
 }

 int main(int, char**)
 {
   using namespace fs;
   for (auto const & TC : Cases) {
     {
       path LHS((const char*)TC.lhs);
       path RHS((const char*)TC.rhs);
       path& Ref = (LHS += RHS);
       assert(LHS == (const char*)TC.expect);
       assert(&Ref == &LHS);
     }
     {
       path LHS((const char*)TC.lhs);
       std::basic_string_view<path::value_type> RHS((const path::value_type*)TC.rhs);
       path& Ref = (LHS += RHS);
       assert(LHS == (const char*)TC.expect);
       assert(&Ref == &LHS);
     }
     doConcatSourceTest<char>    (TC);
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
     doConcatSourceTest<wchar_t> (TC);
 #endif
     doConcatSourceTest<char16_t>(TC);
     doConcatSourceTest<char32_t>(TC);
   }
   for (auto const & TC : LongLHSCases) {
     // Do path test
     {
       path LHS((const char*)TC.lhs);
       path RHS((const char*)TC.rhs);
       const char* E = TC.expect;
       PathReserve(LHS, StrLen(E) + 5);
       {
         LIBCPP_ONLY(DisableAllocationGuard g);
         path& Ref = (LHS += RHS);
         assert(&Ref == &LHS);
       }
       assert(LHS == E);
     }
     {
       path LHS((const char*)TC.lhs);
       std::basic_string_view<path::value_type> RHS((const path::value_type*)TC.rhs);
       const char* E = TC.expect;
       PathReserve(LHS, StrLen(E) + 5);
       {
         LIBCPP_ONLY(DisableAllocationGuard g);
         path& Ref = (LHS += RHS);
         assert(&Ref == &LHS);
       }
       assert(LHS == E);
     }
     LIBCPP_ONLY(doConcatSourceAllocTest<char>(TC));
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
     LIBCPP_ONLY(doConcatSourceAllocTest<wchar_t>(TC));
 #endif
   }
   for (auto const& TC : CharTestCases) {
     doConcatECharTest<char>(TC);
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
     doConcatECharTest<wchar_t>(TC);
 #endif
     doConcatECharTest<char16_t>(TC);
     doConcatECharTest<char32_t>(TC);
   }
   test_sfinae();

   return 0;
 }
	//===----------------------------------------------------------------------===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//

	// UNSUPPORTED: c++03

	// These tests require locale for non-char paths
	// UNSUPPORTED: libcpp-has-no-localization

	// <filesystem>

	// class path

	// path& operator+=(const path& x);
	// path& operator+=(const string_type& x);
	// path& operator+=(string_view x);
	// path& operator+=(const value_type* x);
	// path& operator+=(value_type x);
	// template <class Source>
	// path& operator+=(const Source& x);
	// template <class EcharT>
	// path& operator+=(EcharT x);
	// template <class Source>
	// path& concat(const Source& x);
	// template <class InputIterator>
	// path& concat(InputIterator first, InputIterator last);


	#include "filesystem_include.h"
	#include <type_traits>
	#include <string>
	#include <string_view>
	#include <cassert>

	// On Windows, charset conversions cause allocations in the path class in
	// cases where no allocations are done on other platforms.

	#include "test_macros.h"
	#include "test_iterators.h"
	#include "count_new.h"
	#include "filesystem_test_helper.h"


	struct ConcatOperatorTestcase {
	MultiStringType lhs;
	MultiStringType rhs;
	MultiStringType expect;
	};

	#define LONGSTR "LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR_LONGSTR"
	#define S(Str) MKSTR(Str)
	const ConcatOperatorTestcase Cases[] =
	{
	{S(""), S(""), S("")}
	, {S("p1"), S("p2"), S("p1p2")}
	, {S("p1/"), S("/p2"), S("p1//p2")}
	, {S(""), S("\\foo/bar/baz"), S("\\foo/bar/baz")}
	, {S("c:\\foo"), S(""), S("c:\\foo")}
	, {S(LONGSTR), S("foo"), S(LONGSTR "foo")}
	, {S("abcdefghijklmnopqrstuvwxyz/\\"), S("/\\123456789"), S("abcdefghijklmnopqrstuvwxyz/\\/\\123456789")}
	};
	const ConcatOperatorTestcase LongLHSCases[] =
	{
	{S(""), S(LONGSTR), S(LONGSTR)}
	, {S("p1/"), S(LONGSTR), S("p1/" LONGSTR)}
	};
	const ConcatOperatorTestcase CharTestCases[] =
	{
	{S(""), S("P"), S("P")}
	, {S("/fooba"), S("r"), S("/foobar")}
	};
	#undef S
	#undef LONGSTR

	// The concat operator may need to allocate a temporary buffer before a code_cvt
	// conversion. Test if this allocation occurs by:
	// 1. Create a path, `LHS`, and reserve enough space to append `RHS`.
	// This prevents `LHS` from allocating during the actual appending.
	// 2. Create a `Source` object `RHS`, which represents a "large" string.
	// (The string must not trigger the SSO)
	// 3. Concat `RHS` to `LHS` and check for the expected allocation behavior.
	template <class CharT>
	void doConcatSourceAllocTest(ConcatOperatorTestcase const& TC)
	{
	using namespace fs;
	using Ptr = CharT const*;
	using Str = std::basic_string<CharT>;
	using StrView = std::basic_string_view<CharT>;
	using InputIter = cpp17_input_iterator<Ptr>;

	const Ptr L = TC.lhs;
	const Ptr R = TC.rhs;
	const Ptr E = TC.expect;
	std::size_t ReserveSize = StrLen(E) + 1;
	// basic_string
	{
	path LHS(L); PathReserve(LHS, ReserveSize);
	Str RHS(R);
	{
	TEST_NOT_WIN32(DisableAllocationGuard g);
	LHS += RHS;
	}
	assert(LHS == E);
	}
	// basic_string_view
	{
	path LHS(L); PathReserve(LHS, ReserveSize);
	StrView RHS(R);
	{
	TEST_NOT_WIN32(DisableAllocationGuard g);
	LHS += RHS;
	}
	assert(LHS == E);
	}
	// CharT*
	{
	path LHS(L); PathReserve(LHS, ReserveSize);
	Ptr RHS(R);
	{
	TEST_NOT_WIN32(DisableAllocationGuard g);
	LHS += RHS;
	}
	assert(LHS == E);
	}
	{
	path LHS(L); PathReserve(LHS, ReserveSize);
	Ptr RHS(R);
	{
	TEST_NOT_WIN32(DisableAllocationGuard g);
	LHS.concat(RHS, StrEnd(RHS));
	}
	assert(LHS == E);
	}
	// input iterator - For non-native char types, appends needs to copy the
	// iterator range into a contiguous block of memory before it can perform the
	// code_cvt conversions.
	// For the path native type, no allocations will be performed because no
	// conversion is required.

	#if TEST_SUPPORTS_LIBRARY_INTERNAL_ALLOCATIONS
	// Only check allocations if we can pick up allocations done within the
	// library implementation.
	bool ExpectNoAllocations = std::is_same<CharT, path::value_type>::value;
	#endif
	{
	path LHS(L); PathReserve(LHS, ReserveSize);
	InputIter RHS(R);
	{
	RequireAllocationGuard g(0); // require "at least zero" allocations by default
	#if TEST_SUPPORTS_LIBRARY_INTERNAL_ALLOCATIONS
	if (ExpectNoAllocations)
	g.requireExactly(0);
	#endif
	LHS += RHS;
	}
	assert(LHS == E);
	}
	{
	path LHS(L); PathReserve(LHS, ReserveSize);
	InputIter RHS(R);
	InputIter REnd(StrEnd(R));
	{
	RequireAllocationGuard g(0); // require "at least zero" allocations by default
	#if TEST_SUPPORTS_LIBRARY_INTERNAL_ALLOCATIONS
	if (ExpectNoAllocations)
	g.requireExactly(0);
	#endif
	LHS.concat(RHS, REnd);
	}
	assert(LHS == E);
	}
	}

	template <class CharT>
	void doConcatSourceTest(ConcatOperatorTestcase const& TC)
	{
	using namespace fs;
	using Ptr = CharT const*;
	using Str = std::basic_string<CharT>;
	using StrView = std::basic_string_view<CharT>;
	using InputIter = cpp17_input_iterator<Ptr>;
	const Ptr L = TC.lhs;
	const Ptr R = TC.rhs;
	const Ptr E = TC.expect;
	// basic_string
	{
	path LHS(L);
	Str RHS(R);
	path& Ref = (LHS += RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	{
	path LHS(L);
	Str RHS(R);
	path& Ref = LHS.concat(RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	// basic_string_view
	{
	path LHS(L);
	StrView RHS(R);
	path& Ref = (LHS += RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	{
	path LHS(L);
	StrView RHS(R);
	path& Ref = LHS.concat(RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	// Char*
	{
	path LHS(L);
	Str RHS(R);
	path& Ref = (LHS += RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	{
	path LHS(L);
	Ptr RHS(R);
	path& Ref = LHS.concat(RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	{
	path LHS(L);
	Ptr RHS(R);
	path& Ref = LHS.concat(RHS, StrEnd(RHS));
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	// iterators
	{
	path LHS(L);
	InputIter RHS(R);
	path& Ref = (LHS += RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	{
	path LHS(L); InputIter RHS(R);
	path& Ref = LHS.concat(RHS);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	{
	path LHS(L);
	InputIter RHS(R);
	InputIter REnd(StrEnd(R));
	path& Ref = LHS.concat(RHS, REnd);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	}

	template <class CharT>
	void doConcatECharTest(ConcatOperatorTestcase const& TC)
	{
	using namespace fs;
	using Ptr = CharT const*;
	const Ptr RStr = TC.rhs;
	assert(StrLen(RStr) == 1);
	const Ptr L = TC.lhs;
	const CharT R = RStr[0];
	const Ptr E = TC.expect;
	{
	path LHS(L);
	path& Ref = (LHS += R);
	assert(LHS == E);
	assert(&Ref == &LHS);
	}
	}


	template <class It, class = decltype(fs::path{}.concat(std::declval<It>()))>
	constexpr bool has_concat(int) { return true; }
	template <class It>
	constexpr bool has_concat(long) { return false; }

	template <class It, class = decltype(fs::path{}.operator+=(std::declval<It>()))>
	constexpr bool has_concat_op(int) { return true; }
	template <class It>
	constexpr bool has_concat_op(long) { return false; }
	template <class It>
	constexpr bool has_concat_op() { return has_concat_op<It>(0); }

	template <class It>
	constexpr bool has_concat() {
	static_assert(has_concat<It>(0) == has_concat_op<It>(0), "must be same");
	return has_concat<It>(0) && has_concat_op<It>(0);
	}

	void test_sfinae() {
	using namespace fs;
	{
	static_assert(has_concat_op<char>(), "");
	static_assert(has_concat_op<const char>(), "");
	static_assert(has_concat_op<char16_t>(), "");
	static_assert(has_concat_op<const char16_t>(), "");
	}
	{
	using It = const char* const;
	static_assert(has_concat<It>(), "");
	}
	{
	using It = cpp17_input_iterator<const char*>;
	static_assert(has_concat<It>(), "");
	}
	{
	struct Traits {
	using iterator_category = std::input_iterator_tag;
	using value_type = const char;
	using pointer = const char*;
	using reference = const char&;
	using difference_type = std::ptrdiff_t;
	};
	using It = cpp17_input_iterator<const char*, Traits>;
	static_assert(has_concat<It>(), "");
	}
	{
	using It = output_iterator<const char*>;
	static_assert(!has_concat<It>(), "");
	}
	{
	static_assert(!has_concat<int>(0), "");
	// operator+=(int) is well formed since it converts to operator+=(value_type)
	// but concat(int) isn't valid because there is no concat(value_type).
	// This should probably be addressed by a LWG issue.
	static_assert(has_concat_op<int>(), "");
	}
	{
	static_assert(!has_concat<int*>(), "");
	}
	}

	int main(int, char**)
	{
	using namespace fs;
	for (auto const & TC : Cases) {
	{
	path LHS((const char*)TC.lhs);
	path RHS((const char*)TC.rhs);
	path& Ref = (LHS += RHS);
	assert(LHS == (const char*)TC.expect);
	assert(&Ref == &LHS);
	}
	{
	path LHS((const char*)TC.lhs);
	std::basic_string_view<path::value_type> RHS((const path::value_type*)TC.rhs);
	path& Ref = (LHS += RHS);
	assert(LHS == (const char*)TC.expect);
	assert(&Ref == &LHS);
	}
	doConcatSourceTest<char> (TC);
	#ifndef TEST_HAS_NO_WIDE_CHARACTERS
	doConcatSourceTest<wchar_t> (TC);
	#endif
	doConcatSourceTest<char16_t>(TC);
	doConcatSourceTest<char32_t>(TC);
	}
	for (auto const & TC : LongLHSCases) {
	// Do path test
	{
	path LHS((const char*)TC.lhs);
	path RHS((const char*)TC.rhs);
	const char* E = TC.expect;
	PathReserve(LHS, StrLen(E) + 5);
	{
	LIBCPP_ONLY(DisableAllocationGuard g);
	path& Ref = (LHS += RHS);
	assert(&Ref == &LHS);
	}
	assert(LHS == E);
	}
	{
	path LHS((const char*)TC.lhs);
	std::basic_string_view<path::value_type> RHS((const path::value_type*)TC.rhs);
	const char* E = TC.expect;
	PathReserve(LHS, StrLen(E) + 5);
	{
	LIBCPP_ONLY(DisableAllocationGuard g);
	path& Ref = (LHS += RHS);
	assert(&Ref == &LHS);
	}
	assert(LHS == E);
	}
	LIBCPP_ONLY(doConcatSourceAllocTest<char>(TC));
	#ifndef TEST_HAS_NO_WIDE_CHARACTERS
	LIBCPP_ONLY(doConcatSourceAllocTest<wchar_t>(TC));
	#endif
	}
	for (auto const& TC : CharTestCases) {
	doConcatECharTest<char>(TC);
	#ifndef TEST_HAS_NO_WIDE_CHARACTERS
	doConcatECharTest<wchar_t>(TC);
	#endif
	doConcatECharTest<char16_t>(TC);
	doConcatECharTest<char32_t>(TC);
	}
	test_sfinae();

	return 0;
	}