forked from OSchip/llvm-project
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <string_view>
|
|
|
|
// constexpr const_iterator begin() const;
|
|
|
|
#include <string_view>
|
|
#include <cassert>
|
|
|
|
#include "test_macros.h"
|
|
|
|
template <class S>
|
|
void
|
|
test(S s)
|
|
{
|
|
const S& cs = s;
|
|
typename S::iterator b = s.begin();
|
|
typename S::const_iterator cb1 = cs.begin();
|
|
typename S::const_iterator cb2 = s.cbegin();
|
|
if (!s.empty())
|
|
{
|
|
assert( *b == s[0]);
|
|
assert( &*b == &s[0]);
|
|
assert( *cb1 == s[0]);
|
|
assert(&*cb1 == &s[0]);
|
|
assert( *cb2 == s[0]);
|
|
assert(&*cb2 == &s[0]);
|
|
|
|
}
|
|
assert( b == cb1);
|
|
assert( b == cb2);
|
|
assert(cb1 == cb2);
|
|
}
|
|
|
|
|
|
int main()
|
|
{
|
|
typedef std::string_view string_view;
|
|
typedef std::u16string_view u16string_view;
|
|
typedef std::u32string_view u32string_view;
|
|
typedef std::wstring_view wstring_view;
|
|
|
|
test(string_view ());
|
|
test(u16string_view());
|
|
test(u32string_view());
|
|
test(wstring_view ());
|
|
test(string_view ( "123"));
|
|
test(wstring_view (L"123"));
|
|
#if TEST_STD_VER >= 11
|
|
test(u16string_view{u"123"});
|
|
test(u32string_view{U"123"});
|
|
#endif
|
|
|
|
#if TEST_STD_VER > 11
|
|
{
|
|
constexpr string_view sv { "123", 3 };
|
|
constexpr u16string_view u16sv {u"123", 3 };
|
|
constexpr u32string_view u32sv {U"123", 3 };
|
|
constexpr wstring_view wsv {L"123", 3 };
|
|
|
|
static_assert ( *sv.begin() == sv[0], "" );
|
|
static_assert ( *u16sv.begin() == u16sv[0], "" );
|
|
static_assert ( *u32sv.begin() == u32sv[0], "" );
|
|
static_assert ( *wsv.begin() == wsv[0], "" );
|
|
|
|
static_assert ( *sv.cbegin() == sv[0], "" );
|
|
static_assert ( *u16sv.cbegin() == u16sv[0], "" );
|
|
static_assert ( *u32sv.cbegin() == u32sv[0], "" );
|
|
static_assert ( *wsv.cbegin() == wsv[0], "" );
|
|
}
|
|
#endif
|
|
}
|