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/* Copyright (C) 2013 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef INCLUDED_CODE_GENERATION
#define INCLUDED_CODE_GENERATION
/**
* package code into a single statement.
*
* @param STMT_code__ code to be bundled. (must be interpretable as
* a macro argument, i.e. sequence of tokens).
* the argument name is chosen to avoid conflicts.
*
* notes:
* - for(;;) { break; } and {} don't work because invocations of macros
* implemented with STMT often end with ";", thus breaking if() expressions.
* - we'd really like to eliminate "conditional expression is constant"
* warnings. replacing 0 literals with extern volatile variables fools
* VC7 but isn't guaranteed to be free of overhead. we will just
* squelch the warning (unfortunately non-portable).
**/
#define STMT(STMT_code__) do { STMT_code__; } while(false)
/**
* execute the code passed as a parameter only the first time this is
* reached.
* may be called at any time (in particular before main), but is not
* thread-safe. if that's important, use pthread_once() instead.
**/
#define ONCE(ONCE_code__)\
STMT(\
static bool ONCE_done__ = false;\
if(!ONCE_done__)\
{\
ONCE_done__ = true;\
ONCE_code__;\
}\
)
/**
* execute the code passed as a parameter except the first time this is
* reached.
* may be called at any time (in particular before main), but is not
* thread-safe.
**/
#define ONCE_NOT(ONCE_code__)\
STMT(\
static bool ONCE_done__ = false;\
if(!ONCE_done__)\
ONCE_done__ = true;\
else\
ONCE_code__;\
)
/**
* execute the code passed as a parameter before main is entered.
*
* WARNING: if the source file containing this is not directly referenced
* from anywhere, linkers may discard that object file (unless linking
* statically). see http://www.cbloom.com/3d/techdocs/more_coding.txt
**/
#define AT_STARTUP(code__)\
namespace { struct UID__\
{\
UID__() { code__; }\
} UID2__; }
/**
* C++ new wrapper: allocates an instance of the given type and stores a
* pointer to it. sets pointer to 0 on allocation failure.
*
* this simplifies application code when on VC6, which may or
* may not throw/return 0 on failure.
**/
#define SAFE_NEW(type, ptr)\
type* ptr;\
try\
{\
ptr = new type();\
}\
catch(std::bad_alloc&)\
{\
ptr = 0;\
}
/**
* delete memory ensuing from new and set the pointer to zero
* (thus making double-frees safe / a no-op)
**/
#define SAFE_DELETE(p)\
STMT(\
delete (p); /* if p == 0, delete is a no-op */ \
(p) = 0;\
)
/**
* delete memory ensuing from new[] and set the pointer to zero
* (thus making double-frees safe / a no-op)
**/
#define SAFE_ARRAY_DELETE(p)\
STMT(\
delete[] (p); /* if p == 0, delete is a no-op */ \
(p) = 0;\
)
/**
* free memory ensuing from malloc and set the pointer to zero
* (thus making double-frees safe / a no-op)
**/
#define SAFE_FREE(p)\
STMT(\
free((void*)p); /* if p == 0, free is a no-op */ \
(p) = 0;\
)
#endif // #ifndef INCLUDED_CODE_GENERATION
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