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Compiler Warning (level 3) C4267

  • Article

'var' : conversion from 'size_t' to 'type', possible loss of data

The compiler detected a conversion from size_t to a smaller type.

To fix this warning, use size_t instead of type. Alternatively, use an integral type that is at least as large as size_t.

Example

The following example generates C4267.

// C4267.cpp
// compile by using: cl /W4 C4267.cpp
void Func1(short) {}
void Func2(int) {}
void Func3(long) {}
void Func4(size_t) {}

int main() {
   size_t bufferSize = 10;
   Func1(bufferSize);   // C4267 for all platforms
   Func2(bufferSize);   // C4267 only for 64-bit platforms
   Func3(bufferSize);   // C4267 only for 64-bit platforms
   Func4(bufferSize);   // OK for all platforms
}