Copying constant amount of data

This is a discussion on Copying constant amount of data within the C++ Programming forums, part of the General Programming Boards category; You know, that's what std::size_t and std::ptrdiff_t are for. They're in <cstddef>. On some systems, you can also find intptr_t ...

  1. #16
    Cat without Hat CornedBee's Avatar
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    You know, that's what std::size_t and std::ptrdiff_t are for. They're in <cstddef>.

    On some systems, you can also find intptr_t and uintptr_t. They'd be in the C99 header <stdint.h>. Boost also provides them, I think, as boost::intptr_t and boost::uintptr_t in <boost/stdint.hpp>.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
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  2. #17
    Registered User
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    And, you can't get typedefs that depend on architecture with the preprocessor. Instead use this;
    Code:
    template<int bit_size> struct Helper
    {
    };
    
    template<> struct Helper<16>
    {
        typedef   int16_t   intw;
        typedef  uint16_t  uintw;
    };
    
    template<> struct Helper<32>
    {
        typedef   int32_t   intw;
        typedef  uint32_t  uintw;
    };
    
    template<> struct Helper<64>
    {
        typedef   int64_t   intw;
        typedef  uint64_t  uintw;
    };
    
    typedef Helper<sizeof(void *)*CHAR_BIT>::intw intw;
    typedef Helper<sizeof(void *)*CHAR_BIT>::uintw uintw;
    This, of course, relies on the types intXX_t and uintXX_t types being declared on your target system - which is not guaranteed either, IIRC.

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