如何要求显式强制转换

我有以下错误：

error: use of overloaded operator '+' is ambiguous (with operand types 'InObj' and 'class PerformObj')

原因是我为PerformObj提供了vector<int>转换运算符，以便将结果存储在向量中。然而，问题是，因为InObj期望vector<int>在右侧，所以它隐式地转换PerformObj，从而导致问题。我希望PerformObj只能显式转换为vector<int>（加上为可读性添加的符号）。

x is an integer
nums is a vector<int>
cube is a lambda
((x + in + nums) + perform + cube)
 ^inobj            ^ implicitly converted to vector<int>
^performobj

如您所见，PerformObj将InObj作为左侧参数，但添加转换运算符会导致歧义。

理想情况下，我想要这样的东西：

std::vector<int> results = static_cast<vector<int>>(x in num perform cube);

供参考，这里是代码：

InObj& operator+(InObj& lhs, const std::vector<int>& rhs) {
    lhs.rhs = rhs;
    return lhs;
} 
class PerformObj {
public:
    // snip
    operator std::vector<int>() const {
        std::vector<int> temp;
        for (int i = 0; i < lhs.rhs.size(); i++) {
            temp.push_back(rhs(lhs.rhs[i]));
        }
        return temp;
    }
    friend std::ostream& operator<<(std::ostream& os, const PerformObj& po);
} performobj;
PerformObj& operator+(const InObj& lhs, PerformObj& rhs) {
    rhs.lhs = lhs;
    return rhs;
}
// Error occurs on the following line
std::cout << x in nums perform cube << std::endl;