Урок 2 Отношения между классами

kutuzzzov

Apr 6th, 2023

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#include <cassert>
#include <string>
#include <stdexcept>
#include <iostream>
using namespace std;
class House {
// Реализуйте самостоятельно
public:
explicit House(int length, int width, int height) : length_(length), width_(width), height_(height) {}
int GetLength() const {
return length_;
}
int GetWidth() const {
return width_;
}
int GetHeight() const {
return height_;
}
private:
int length_;
int width_;
int height_;
};
class Resources {
// Реализуйте самостоятельно
public:
explicit Resources(int brick_count) : brick_count_(brick_count) {}
void TakeBricks(int count) {
if (count < 0 || brick_count_ - count < 0) {
throw out_of_range("Num of bricks < 0, or > brick resources");
}
brick_count_ -= count;
}
int GetBrickCount() const {
return brick_count_;
}
private:
int brick_count_ = 0;
};
struct HouseSpecification {
int length = 0;
int width = 0;
int height = 0;
};
class Builder {
// Реализуйте самостоятельно
public:
explicit Builder(Resources& resources) : resources_(resources) {}
House BuildHouse(HouseSpecification spec) {
int brick_needs = (spec.length + spec.width) * 2 * spec.height * 32;
if (resources_.GetBrickCount() < brick_needs) {
throw runtime_error("Brick needs higher than resources");
}
resources_.TakeBricks(brick_needs);
return House{spec.length, spec.width, spec.height};
}
private:
Resources& resources_;
};
int main() {
Resources resources{10000};
Builder builder1{resources};
Builder builder2{resources};
House house1 = builder1.BuildHouse(HouseSpecification{12, 9, 3});
assert(house1.GetLength() == 12);
assert(house1.GetWidth() == 9);
assert(house1.GetHeight() == 3);
cout << resources.GetBrickCount() << " bricks left"s << endl;
House house2 = builder2.BuildHouse(HouseSpecification{8, 6, 3});
assert(house2.GetLength() == 8);
cout << resources.GetBrickCount() << " bricks left"s << endl;
House banya = builder1.BuildHouse(HouseSpecification{4, 3, 2});
assert(banya.GetHeight() == 2);
cout << resources.GetBrickCount() << " bricks left"s << endl;
}

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