CODEWITHSUNDEEP
c
RFOoD x MoDz
RFOoD x MoDz

Reputation: 11

Can't set static variable

uint64 gameVarsAddress; 
switch(version) { 
case 100: 
  gameVarsAddress = 0x44500000; 
  break; 
case 105: 
  gameVarsAddress = 0x4730000; 
  break; 
} 
static struct _gameVars *gameVars = (struct _gameVars *)(void*)gameVarsAddress;

when I use compile it give me error: error: initializer element is not constant | 46

Upvotes: 0

Views: 185

Answers (1)

dbush
dbush

Reputation: 223917

Variables with static storage duration, i.e. those declared either at file scope or with the keyword static, can only be initialized with a constant expression. The value of a variable, even if const, is not a constant expression.

If you use a macro for the value then you can do this. If you don't want gameVarsAddress to be a macro you can still use one to initialize both gameVarsAddress and gameVars:

#define GAME_VARS_ADDRESS_DEFAULT 0x44500000
uint64 gameVarsAddress = GAME_VARS_ADDRESS_DEFAULT;
static struct _gameVars *gameVars = 
    (struct _gameVars*)(void*)GAME_VARS_ADDRESS_DEFAULT;

If on the other hand you want to set the value of gameVars at runtime, you'll need to first initialize it to NULL then set the value later:

static struct _gameVars *gameVars = NULL;
if (!gameVars) {
    // set gameVarsAddress 
    gameVars = (struct _gameVars*)(void*)gameVarsAddress;
}

Upvotes: 1

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