Compiler Error C3531
Visual Studio 2015
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The latest version of this topic can be found at Compiler Error C3531.
symbol': a symbol whose type contains 'auto' must have an initializer
The specified variable does not have an initializer expression.
To correct this error
- Specify an initializer expression, such as a simple assignment that uses equal-sign syntax, when you declare the variable.
The following example yields C3531 because variables x1, y1, y2, y3, and z2 are not initialized.
// C3531.cpp
// Compile with /Zc:auto
int main()
{
auto x1; // C3531
auto y1, y2, y3; // C3531
auto z1 = 1, z2, z3 = -1; // C3531
return 0;
}
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