forked from OSchip/llvm-project
59 lines
1.3 KiB
C++
59 lines
1.3 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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// utilities
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// exchange
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#include <utility>
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#include <cassert>
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#include <string>
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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{
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int v = 12;
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assert ( std::exchange ( v, 23 ) == 12 );
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assert ( v == 23 );
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assert ( std::exchange ( v, 67.2 ) == 23 );
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assert ( v == 67 );
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assert ((std::exchange<int, float> ( v, {} )) == 67 );
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assert ( v == 0 );
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}
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{
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bool b = false;
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assert ( !std::exchange ( b, true ));
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assert ( b );
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}
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{
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const std::string s1 ( "Hi Mom!" );
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const std::string s2 ( "Yo Dad!" );
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std::string s3 = s1; // Mom
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assert ( std::exchange ( s3, s2 ) == s1 );
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assert ( s3 == s2 );
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assert ( std::exchange ( s3, "Hi Mom!" ) == s2 );
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assert ( s3 == s1 );
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s3 = s2; // Dad
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assert ( std::exchange ( s3, {} ) == s2 );
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assert ( s3.size () == 0 );
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s3 = s2; // Dad
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assert ( std::exchange ( s3, "" ) == s2 );
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assert ( s3.size () == 0 );
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}
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#endif
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}
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