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Enum std.traits.member isUnsafe
true if func is @system.
Declaration
enum isUnsafe(alias func) = !isSafe!func;
Example
@safe int add(int a, int b) {return a+b;}
@trusted int sub(int a, int b) {return a-b;}
@system int mul(int a, int b) {return a*b;}
static assert(!isUnsafe!add);
static assert(!isUnsafe!sub);
static assert( isUnsafe!mul);
Authors
Walter Bright,
Tomasz Stachowiak (isExpressions