lazy_constructor.cpp

00001 /*
00002  * Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
00003  */
00004 
00005 #include <gtest/gtest.h>
00006 #include <uavcan/util/lazy_constructor.hpp>
00007 
00008 
00009 TEST(LazyConstructor, Basic)
00010 {
00011     using ::uavcan::LazyConstructor;
00012 
00013     LazyConstructor<std::string> a;
00014     LazyConstructor<std::string> b;
00015 
00016     ASSERT_FALSE(a);
00017     ASSERT_FALSE(b.isConstructed());
00018 
00019     /*
00020      * Construction
00021      */
00022     a.destroy(); // no-op
00023     a.construct();
00024     b.construct<const char*>("Hello world");
00025 
00026     ASSERT_TRUE(a);
00027     ASSERT_TRUE(b.isConstructed());
00028 
00029     ASSERT_NE(*a, *b);
00030     ASSERT_STRNE(a->c_str(), b->c_str());
00031 
00032     ASSERT_EQ(*a, "");
00033     ASSERT_EQ(*b, "Hello world");
00034 
00035     /*
00036      * Copying
00037      */
00038     a = b;            // Assignment operator performs destruction and immediate copy construction
00039     ASSERT_EQ(*a, *b);
00040     ASSERT_EQ(*a, "Hello world");
00041 
00042     LazyConstructor<std::string> c(a); // Copy constructor call is forwarded to std::string
00043 
00044     ASSERT_EQ(*c, *a);
00045 
00046     *a = "123";
00047     ASSERT_NE(*c, *a);
00048     ASSERT_EQ(*c, *b);
00049 
00050     *c = "456";
00051     ASSERT_NE(*a, *c);
00052     ASSERT_NE(*b, *a);
00053     ASSERT_NE(*c, *b);
00054 
00055     /*
00056      * Destruction
00057      */
00058     ASSERT_TRUE(c);
00059     c.destroy();
00060     ASSERT_FALSE(c);
00061 }