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Array
This example demonstrates a test case for boost::array an, STL compliant container wrapper for arrays of constant size. STL provides class std::vector as a replacement for ordinary arrays. However, std::vector<> provides the semantics of dynamic arrays. Thus, it manages data to be able to change the number of elements. This results in some overhead only in the case of arrays that need static size. Class array fulfills most but, not all of the requirements of "reversible containers". An array is not a reversible STL container because of the following reasons:
- No constructors are provided.
- Elements may have an undetermined initial value – An array can be initialized
with a brace-enclosing, comma-seperated list of initializers for the elements
of container, written in increasing subscript order :
boost::array <int,4>a={1,2,3}Note : If there are fewer elements in the initializer list, then each remaining element gets default-initialized (thus, it has a defined value). - swap()- has no constant complexity.
- front() and back() are provided.
- operator[] and at() are provided.
- size() is always constant, based on the second template argument of the type.
- The container provides no allocator support.
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MMP File for Array
The MMP file for Array is as shown below:
TARGET OpenCBoostArrayEx.exe TARGETTYPE exe UID 0 0xEA9D51D0 USERINCLUDE ..\inc SOURCEPATH ..\data START RESOURCE OpenCBoostArrayEx_reg.rss #ifdef WINSCW TARGETPATH \private\10003a3f\apps #else TARGETPATH \private\10003a3f\import\apps #endif END //RESOURCE SOURCEPATH ..\src SOURCE OpenCBoostArrayEx.cpp SYSTEMINCLUDE \epoc32\include SYSTEMINCLUDE \epoc32\include\stdapis SYSTEMINCLUDE \epoc32\include\stdapis\sys SYSTEMINCLUDE \epoc32\include\stdapis\stlport SYSTEMINCLUDE \epoc32\include\stdapis\stlport\stl SYSTEMINCLUDE \epoc32\include\stdapis\boost STATICLIBRARY libcrt0.lib STATICLIBRARY EEXE.LIB LIBRARY libstdcpp.lib LIBRARY libc.lib LIBRARY libpthread.lib LIBRARY euser.lib OPTION CW -wchar_t on MACRO _WCHAR_T_DECLARED
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Source Code for Array
The code snippet below is an example usage for the boost array:
#include <string>
#include <iostream>
#include <boost/array.hpp>
// This is a GCCE toolchain workaround needed when compiling with GCCE
// and using main() entry point
#ifdef __GCCE__
#include <staticlibinit_gcce.h>
#endif
namespace {
unsigned int failed_tests = 0;
void fail_test( const char * reason ) {
++failed_tests;
std::cerr << "Test failure " << failed_tests << ": " << reason << std::endl;
}
template<class T>
void BadValue( const T & )
{
fail_test( "Unexpected value" );
}
template<class T>
void RunTests()
{
typedef boost::array< T, 0 > test_type;
// Test value and aggegrate initialization
test_type test_case = {};
const boost::array< T, 0 > const_test_case = test_type();
test_case.assign( T() );
// front/back and operator[] must compile, but calling them is undefined
// Likewise, all tests below should evaluate to false, avoiding undefined behaviour
if( !test_case.empty() ) {
BadValue( test_case.front() );
}
if( !const_test_case.empty() ) {
BadValue( const_test_case.back() );
}
if( test_case.size() > 0 ) {
BadValue( test_case[ 0 ] );
}
if( const_test_case.max_size() > 0 ) {
BadValue( const_test_case[ 0 ] );
}
// Assert requirements of TR1 6.2.2.4
if( test_case.begin() != test_case.end() ) {
fail_test( "Not an empty range" );
}
if( const_test_case.begin() != const_test_case.end() ) {
fail_test( "Not an empty range" );
}
if( test_case.begin() == const_test_case.begin() ) {
fail_test( "iterators for different containers are not distinct" );
}
if( test_case.data() == const_test_case.data() ) {
// Value of data is unspecified in TR1, so no requirement this test pass or fail
// However, it must compile!
}
// Check can safely use all iterator types with std algorithms
std::for_each( test_case.begin(), test_case.end(), BadValue< T > );
std::for_each( test_case.rbegin(), test_case.rend(), BadValue< T > );
std::for_each( const_test_case.begin(), const_test_case.end(), BadValue< T > );
std::for_each( const_test_case.rbegin(), const_test_case.rend(), BadValue< T > );
// Check swap is well formed
std::swap( test_case, test_case );
// Check assigment operator and overloads are well formed
test_case = const_test_case;
// Confirm at() throws the std lib defined exception
try {
BadValue( test_case.at( 0 ) );
} catch ( const std::range_error & ) {
}
try {
BadValue( const_test_case.at( 0 ) );
} catch ( const std::range_error & ) {
}
}
}
int main()
{
RunTests< bool >();
RunTests< void * >();
RunTests< long double >();
RunTests< std::string >();
if(failed_tests != 0)
printf("Test Failed");
else
printf("Test Passed. No failed cases for Bool, void, double and string");
getchar();
return 0;
}