diff --git a/test/Jamfile.v2 b/test/Jamfile.v2 index 78bdd7f..d3fc34c 100644 --- a/test/Jamfile.v2 +++ b/test/Jamfile.v2 @@ -32,6 +32,7 @@ test-suite utility [ compile result_of_test.cpp ] [ run ../shared_iterator_test.cpp ] [ run ../value_init_test.cpp ] + [ run ../value_init_workaround_test.cpp ] [ run ../initialized_test.cpp ] [ compile-fail ../value_init_test_fail1.cpp ] [ compile-fail ../value_init_test_fail2.cpp ] diff --git a/value_init_workaround_test.cpp b/value_init_workaround_test.cpp new file mode 100644 index 0000000..958ddb3 --- /dev/null +++ b/value_init_workaround_test.cpp @@ -0,0 +1,119 @@ +// Copyright 2010, Niels Dekker. +// +// Distributed under the Boost Software License, Version 1.0. (See +// accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) +// +// Test program for the boost::value_initialized workaround. +// +// 30 May 2010 (Created) Niels Dekker + +// Switch the workaround off, before inluding "value_init.hpp". +#define BOOST_DETAIL_VALUE_INIT_WORKAROUND 0 +#include + +#include // For cout. +#include // For EXIT_SUCCESS and EXIT_FAILURE. + +namespace +{ + struct empty_struct + { + }; + + // A POD aggregate struct derived from an empty struct. + // Similar to struct Foo1 from Microsoft Visual C++ bug report 484295, + // "VC++ does not value-initialize members of derived classes without + // user-declared constructor", reported in 2009 by Sylvester Hesp: + // https://connect.microsoft.com/VisualStudio/feedback/details/484295 + struct derived_struct: empty_struct + { + int data; + }; + + bool is_value_initialized(const derived_struct& arg) + { + return arg.data == 0; + } + + + class virtual_destructor_holder + { + public: + int i; + virtual ~virtual_destructor_holder() + { + } + }; + + bool is_value_initialized(const virtual_destructor_holder& arg) + { + return arg.i == 0; + } + + template + bool is_value_initialized(const T(& arg)[2]) + { + return + is_value_initialized(arg[0]) && + is_value_initialized(arg[1]); + } + + template + bool is_value_initialized(const boost::value_initialized& arg) + { + return is_value_initialized(arg.data()); + } + + // Returns zero when the specified object is value-initializated, and one otherwise. + // Prints a message to standard output if the value-initialization has failed. + template + unsigned failed_to_value_initialized(const T& object, const char *const object_name) + { + if ( is_value_initialized(object) ) + { + return 0u; + } + else + { + std::cout << "Note: Failed to value-initialize " << object_name << '.' << std::endl; + return 1u; + } + } + +// A macro that passed both the name and the value of the specified object to +// the function above here. +#define FAILED_TO_VALUE_INITIALIZE(value) failed_to_value_initialized(value, #value) + + // Equivalent to the dirty_stack() function from GCC Bug 33916, + // "Default constructor fails to initialize array members", reported in 2007 by + // Michael Elizabeth Chastain: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916 + void dirty_stack() + { + unsigned char array_on_stack[4096]; + for (unsigned i = 0; i < sizeof(array_on_stack); ++i) + { + array_on_stack[i] = 0x11; + } + } + +} + + +int main() +{ + dirty_stack(); + + // TODO More types may be added later. + const unsigned num_failures = + FAILED_TO_VALUE_INITIALIZE(boost::value_initialized()) + + FAILED_TO_VALUE_INITIALIZE(boost::value_initialized()); + +#ifdef BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED + // One or more failures are expected. + return num_failures > 0 ? EXIT_SUCCESS : EXIT_FAILURE; +#else + // No failures are expected. + return num_failures == 0 ? EXIT_SUCCESS : EXIT_FAILURE; +#endif +}