c语言中指针不为空判断,如何检查从C传递的函数指针是否为非NULL
示例代码如下Rust部分:#[no_mangle]pub extern fn call_c_function(value: i32,fun: fn(i32) -> i32) -> i32 {fun(value)}而C部分:int32_t call_c_function(int32_t value,int32_t (*fun)(int32_t));int32_t triple(int32...