mirror of https://github.com/OpenTTD/OpenTTD.git
85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
/* $Id$ */
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/** @file alloc_func.hpp Functions related to the allocation of memory */
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#ifndef ALLOC_FUNC_HPP
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#define ALLOC_FUNC_HPP
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/**
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* Simplified allocation function that allocates the specified number of
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* elements of the given type. It also explicitly casts it to the requested
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* type.
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* @note throws an error when there is no memory anymore.
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* @note the memory contains garbage data (i.e. possibly non-zero values).
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* @param T the type of the variable(s) to allocation.
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* @param num_elements the number of elements to allocate of the given type.
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* @return NULL when num_elements == 0, non-NULL otherwise.
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*/
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template <typename T> FORCEINLINE T* MallocT(size_t num_elements)
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{
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/*
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* MorphOS cannot handle 0 elements allocations, or rather that always
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* returns NULL. So we do that for *all* allocations, thus causing it
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* to behave the same on all OSes.
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*/
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if (num_elements == 0) return NULL;
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T *t_ptr = (T*)malloc(num_elements * sizeof(T));
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if (t_ptr == NULL) error("Out of memory. Cannot allocate %i bytes", num_elements * sizeof(T));
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return t_ptr;
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}
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/**
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* Simplified allocation function that allocates the specified number of
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* elements of the given type. It also explicitly casts it to the requested
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* type.
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* @note throws an error when there is no memory anymore.
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* @note the memory contains all zero values.
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* @param T the type of the variable(s) to allocation.
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* @param num_elements the number of elements to allocate of the given type.
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* @return NULL when num_elements == 0, non-NULL otherwise.
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*/
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template <typename T> FORCEINLINE T* CallocT(size_t num_elements)
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{
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/*
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* MorphOS cannot handle 0 elements allocations, or rather that always
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* returns NULL. So we do that for *all* allocations, thus causing it
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* to behave the same on all OSes.
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*/
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if (num_elements == 0) return NULL;
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T *t_ptr = (T*)calloc(num_elements, sizeof(T));
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if (t_ptr == NULL) error("Out of memory. Cannot allocate %i bytes", num_elements * sizeof(T));
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return t_ptr;
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}
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/**
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* Simplified reallocation function that allocates the specified number of
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* elements of the given type. It also explicitly casts it to the requested
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* type. It extends/shrinks the memory allocation given in t_ptr.
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* @note throws an error when there is no memory anymore.
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* @note the memory contains all zero values.
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* @param T the type of the variable(s) to allocation.
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* @param t_ptr the previous allocation to extend/shrink.
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* @param num_elements the number of elements to allocate of the given type.
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* @return NULL when num_elements == 0, non-NULL otherwise.
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*/
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template <typename T> FORCEINLINE T* ReallocT(T *t_ptr, size_t num_elements)
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{
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/*
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* MorphOS cannot handle 0 elements allocations, or rather that always
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* returns NULL. So we do that for *all* allocations, thus causing it
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* to behave the same on all OSes.
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*/
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if (num_elements == 0) {
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free(t_ptr);
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return NULL;
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}
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t_ptr = (T*)realloc(t_ptr, num_elements * sizeof(T));
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if (t_ptr == NULL) error("Out of memory. Cannot reallocate %i bytes", num_elements * sizeof(T));
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return t_ptr;
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}
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#endif /* ALLOC_FUNC_HPP */
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