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c++visual-studiodeclspec

Is there a way to use __declspec(align) for for declaring of objects with different type

Is there a way to use __declspec(align) for declaring lot of objects in Visual studio? Sth like:

__declspec(align)
{
int p1;
long p2
}

My question is similar to __declspec(align) for multiple declarations. But this question is for objects with same type.

Solution

  • No, you can't apply a single __declspec(align) to a block of unrelated declarations like this. Each individual declarator statement needs its own __declspec:

    Syntax 

    __declspec( align( # ) ) declarator

    You are probably looking for #pragma pack instead:

    Syntax

    #pragma pack( [ show ] | [ push | pop ] [, identifier ] , n  )

    For example:

    #pragma pack(push, 4)
int p1;
long p2
#pragma pack(pop)


    #pragma pack(push, 16)
float rF[4];
float gF[4];
float bF[4];
#pragma pack(pop)

/*
Alternatively:

#pragma pack(push, 16)
typedef float floatArray4[4];
#pragma pack(pop)

floatArray4 rF;
floatArray4 gF;
floatArray4 bF;
*/