Ichthyostega
f393780845
The header "format-cout.hpp" offers a convenience function to print pretty much any object or data in human readable form. However, the formatter for pointers used within this framework switched std::cout into hexadecimal display of numbers and failed to clean-up this state. Since the "stickyness" of IOS stream manipulators is generally a problem, we now provide a RAII helper to capture the previous stream state and automatically restore it when leaving the scope.
136 lines
3.2 KiB
C++
136 lines
3.2 KiB
C++
/*
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IosSavepoint(Test) - manipulate and restore output stream formatting
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Copyright (C) Lumiera.org
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2022, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file ios-savepoint-test.cpp
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** unit test \ref IosSavepoint_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/format-cout.hpp"
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#include "lib/ios-savepoint.hpp"
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#include <string>
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using std::string;
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namespace util {
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namespace test {
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/***************************************************************************//**
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* @test verifies capturing and restoring of std::ostream formatting state.
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* @see ios-savepoint.hpp
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*/
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class IosSavepoint_test
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: public Test
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{
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void
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run (Arg)
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{
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switchToHex();
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__verifySane();
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setFill();
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__verifySane();
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nested();
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__verifySane();
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try {
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restoreAfterException();
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} catch(...){
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cout << "Tilt" <<endl;
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}
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__verifySane();
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}
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/** verify that original state is restored */
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void
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__verifySane()
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{
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cout << std::setw(10) << 42 <<endl;
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}
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/** @test verify that hexadecimal output is cleared */
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void
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switchToHex()
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{
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IosSavepoint save{cout};
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cout << std::hex
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<< std::showbase
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<< 42 <<endl;
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}
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/** @test verify that a custom fill character is cleared */
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void
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setFill()
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{
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IosSavepoint save{cout};
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cout << std::setfill('*')
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<< std::setw(20)
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<< 42 <<endl;
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}
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/** @test verify usage in nested scopes */
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void
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nested()
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{
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IosSavepoint save{cout};
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cout << std::hex << 42 <<endl;
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{
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IosSavepoint inner(cout);
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cout << std::oct << std::showbase << 42 <<endl;
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}
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cout << 42 <<endl;
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}
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/** @test verify clean-up happens even in case of an exception */
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void
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restoreAfterException()
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{
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auto boom = []() -> float
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{ throw 42; };
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IosSavepoint save{cout};
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cout << std::hexfloat
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<< 1234
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<< endl
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<< boom()
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<< endl;
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}
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};
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LAUNCHER (IosSavepoint_test, "unit common");
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}} // namespace util::test
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