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0024191: Static assert functionality should be added to Standard_Assert.hxx

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Added Standard_STATIC_ASSERT macro for compile-time asserts.
The new macro is used in Standard_MMgrOpt and QANCollection.
This commit is contained in:
omy 2013-09-19 16:12:48 +04:00 committed by bugmaster
parent 0ebaa4dbc9
commit 8b381bc3a3
3 changed files with 34 additions and 36 deletions
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38
src/QANCollection/QANCollection4.cxx
View File

@ -24,6 +24,8 @@
#include <NCollection_StdAllocator.hxx>
#include <NCollection_IncAllocator.hxx>
#include <Standard_Assert.hxx>
#include <list>
#include <vector>
@ -41,44 +43,20 @@ static Standard_Integer QANColStdAllocator1(Draw_Interpretor& di, Standard_Integ
//type definitions
typedef Handle_Standard_Transient elem_type;
typedef NCollection_StdAllocator<elem_type> allocator_type;
if ( sizeof (allocator_type::value_type) == sizeof (elem_type) ) {
di << "value_type : OK\n";
} else {
di << "value_type : Error\n";
}
if ( sizeof (allocator_type::pointer) == sizeof (void*) ) {
di << "pointer : OK\n";
} else {
di << "pointer : Error\n";
}
if (sizeof (allocator_type::const_pointer) == sizeof (void*) ) {
di << "const_pointer : OK\n";
} else {
di << "const_pointer : Error\n";
}
Standard_STATIC_ASSERT (sizeof (allocator_type::value_type) == sizeof (elem_type));
Standard_STATIC_ASSERT (sizeof (allocator_type::pointer) == sizeof (void*));
Standard_STATIC_ASSERT (sizeof (allocator_type::const_pointer) == sizeof (void*));
elem_type aDummy;
allocator_type::reference aRef = aDummy;
(void)aRef; // avoid compiler warning on unused
allocator_type::const_reference aConstRef = aDummy;
(void)aConstRef; // avoid compiler warning on unused
if ( sizeof (allocator_type::size_type) == sizeof (size_t) ) {
di << "size_type : OK\n";
} else {
di << "size_type : Error\n";
}
if ( sizeof (allocator_type::difference_type) == sizeof (ptrdiff_t) ) {
di << "allocator_type : OK\n";
} else {
di << "allocator_type : Error\n";
}
Standard_STATIC_ASSERT (sizeof (allocator_type::size_type) == sizeof (size_t));
Standard_STATIC_ASSERT (sizeof (allocator_type::difference_type) == sizeof (ptrdiff_t));
typedef int other_elem_type;
if ( sizeof (allocator_type::rebind<other_elem_type>::other::value_type) == sizeof (other_elem_type) ) {
di << "other_elem_type : OK\n";
} else {
di << "other_elem_type : Error\n";
}
Standard_STATIC_ASSERT (sizeof (allocator_type::rebind<other_elem_type>::other::value_type) == sizeof (other_elem_type));
return 0;
}

24
src/Standard/Standard_Assert.hxx
View File

@ -62,6 +62,13 @@
//!
//! The second argument (message) should be string constant ("...").
//!
//! The Standard_STATIC_ASSERT macro is to be used for compile time checks.
//! To use this macro, write:
//!
//! Standard_STATIC_ASSERT(const_expression);
//!
//! If const_expression is false, a compiler error occurs.
//!
//! The macros are formed as functions and require semicolon at the end.
// Stub function used to make macros complete C++ operator
@ -155,6 +162,23 @@ inline void Standard_ASSERT_DO_NOTHING() {}
//! Raise debug message
#define Standard_ASSERT_INVOKE(theDesc) Standard_ASSERT_INVOKE_(always, theDesc)
//! Static assert --
//! empty default template
template <bool condition>
struct Standard_Static_Assert { };
//! Static assert -- specialization for condition being true
template <>
struct Standard_Static_Assert<true>
{
static void assert_ok() {}
};
//! Cause compiler error if argument is not constant expression or
//! evaluates to false
#define Standard_STATIC_ASSERT(theExpr) \
Standard_Static_Assert<theExpr>::assert_ok();
#endif // Standard_Assert_HeaderFile
#ifdef _MSC_VER

8
src/Standard/Standard_MMgrOpt.cxx
View File

@ -20,7 +20,7 @@
#include <Standard_MMgrOpt.hxx>
#include <Standard_OutOfMemory.hxx>
#include <Standard_Assert.hxx>
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
@ -192,11 +192,7 @@ Standard_MMgrOpt::Standard_MMgrOpt(const Standard_Boolean aClear,
const Standard_Size aThreshold)
{
// check basic assumption
if ( sizeof(Standard_Size) != sizeof(Standard_Address) )
{
cerr << "Fatal error: Open CASCADE Optimized Memory manager: this platform is not supported!" << endl;
exit(1);
}
Standard_STATIC_ASSERT(sizeof(Standard_Size) == sizeof(Standard_Address));
// clear buffer fields
myFreeListMax = 0;