elexis
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
/* Copyright (C) 2013 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef INCLUDED_CODE_GENERATION
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#define INCLUDED_CODE_GENERATION
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/**
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* package code into a single statement.
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*
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* @param STMT_code__ code to be bundled. (must be interpretable as
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* a macro argument, i.e. sequence of tokens).
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* the argument name is chosen to avoid conflicts.
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*
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* notes:
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* - for(;;) { break; } and {} don't work because invocations of macros
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* implemented with STMT often end with ";", thus breaking if() expressions.
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* - we'd really like to eliminate "conditional expression is constant"
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* warnings. replacing 0 literals with extern volatile variables fools
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* VC7 but isn't guaranteed to be free of overhead. we will just
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* squelch the warning (unfortunately non-portable).
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**/
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#define STMT(STMT_code__) do { STMT_code__; } while(false)
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/**
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* execute the code passed as a parameter only the first time this is
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* reached.
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* may be called at any time (in particular before main), but is not
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* thread-safe. if that's important, use pthread_once() instead.
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**/
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#define ONCE(ONCE_code__)\
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STMT(\
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static bool ONCE_done__ = false;\
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if(!ONCE_done__)\
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{\
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ONCE_done__ = true;\
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ONCE_code__;\
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}\
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)
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/**
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* execute the code passed as a parameter except the first time this is
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* reached.
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* may be called at any time (in particular before main), but is not
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* thread-safe.
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**/
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#define ONCE_NOT(ONCE_code__)\
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STMT(\
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static bool ONCE_done__ = false;\
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if(!ONCE_done__)\
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ONCE_done__ = true;\
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else\
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ONCE_code__;\
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)
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/**
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* execute the code passed as a parameter before main is entered.
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*
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* WARNING: if the source file containing this is not directly referenced
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* from anywhere, linkers may discard that object file (unless linking
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* statically). see http://www.cbloom.com/3d/techdocs/more_coding.txt
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**/
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#define AT_STARTUP(code__)\
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namespace { struct UID__\
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{\
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UID__() { code__; }\
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} UID2__; }
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/**
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* C++ new wrapper: allocates an instance of the given type and stores a
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* pointer to it. sets pointer to 0 on allocation failure.
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*
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* this simplifies application code when on VC6, which may or
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* may not throw/return 0 on failure.
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**/
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#define SAFE_NEW(type, ptr)\
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type* ptr;\
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try\
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{\
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ptr = new type();\
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}\
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catch(std::bad_alloc&)\
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{\
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ptr = 0;\
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}
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/**
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* delete memory ensuing from new and set the pointer to zero
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* (thus making double-frees safe / a no-op)
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**/
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#define SAFE_DELETE(p)\
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STMT(\
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delete (p); /* if p == 0, delete is a no-op */ \
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(p) = 0;\
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)
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/**
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* delete memory ensuing from new[] and set the pointer to zero
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* (thus making double-frees safe / a no-op)
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**/
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#define SAFE_ARRAY_DELETE(p)\
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STMT(\
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delete[] (p); /* if p == 0, delete is a no-op */ \
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(p) = 0;\
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)
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/**
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* free memory ensuing from malloc and set the pointer to zero
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* (thus making double-frees safe / a no-op)
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**/
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#define SAFE_FREE(p)\
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STMT(\
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free((void*)p); /* if p == 0, free is a no-op */ \
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(p) = 0;\
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)
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#endif // #ifndef INCLUDED_CODE_GENERATION
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