79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <string_view>
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// void remove_prefix(size_type _n)
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#include <experimental/string_view>
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#include <cassert>
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#include <iostream>
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#include "test_macros.h"
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template<typename CharT>
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void test ( const CharT *s, size_t len ) {
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typedef std::experimental::basic_string_view<CharT> SV;
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{
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SV sv1 ( s );
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assert ( sv1.size() == len );
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assert ( sv1.data() == s );
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if ( len > 0 ) {
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sv1.remove_prefix ( 1 );
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assert ( sv1.size() == (len - 1));
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assert ( sv1.data() == (s + 1));
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sv1.remove_prefix ( len - 1 );
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}
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assert ( sv1.size() == 0 );
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sv1.remove_prefix ( 0 );
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assert ( sv1.size() == 0 );
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}
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}
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#if TEST_STD_VER > 11
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constexpr size_t test_ce ( size_t n, size_t k ) {
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typedef std::experimental::basic_string_view<char> SV;
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SV sv1{ "ABCDEFGHIJKL", n };
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sv1.remove_prefix ( k );
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return sv1.size();
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}
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#endif
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int main () {
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test ( "ABCDE", 5 );
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test ( "a", 1 );
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test ( "", 0 );
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test ( L"ABCDE", 5 );
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test ( L"a", 1 );
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test ( L"", 0 );
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#if TEST_STD_VER >= 11
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test ( u"ABCDE", 5 );
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test ( u"a", 1 );
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test ( u"", 0 );
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test ( U"ABCDE", 5 );
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test ( U"a", 1 );
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test ( U"", 0 );
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#endif
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#if TEST_STD_VER > 11
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{
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static_assert ( test_ce ( 5, 0 ) == 5, "" );
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static_assert ( test_ce ( 5, 1 ) == 4, "" );
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static_assert ( test_ce ( 5, 5 ) == 0, "" );
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static_assert ( test_ce ( 9, 3 ) == 6, "" );
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}
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#endif
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}
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