vector テスト 1

#include <iostream>
#include <vector>
using namespace std;

void vec_test(vector<int> &v, int num, const char *ttl) {
    cout << "[" << ttl << "]" << endl;
    cout << "size()     = " << v.size() << ", ";
    cout << "capacity() = " << v.capacity() << endl;
    int i;
    for (i = 0; i < num; i++)
        v[i] = i;
    try {
        for (i = 0; i < num; i++)
            v.at(i) = i;
    } catch (.../*out_of_range*/) { // gccで何か怒られたので誤魔化す
        cout << "out of range " << i << endl;
    }
    if (v.size()) {
        v.pop_back();
        v.push_back(999);
    }
    cout << "v = ";
    for (i = 0; i < int(v.size()); i++)
        cout << v[i] << ", ";
    cout << endl;
    cout << endl;
}

int main(void) {
    vector<int> v0;
    vec_test(v0, 0, "1)v0定義直後");

    vector<int> v(3);
    vec_test(v, 3, "2)v(3)定義直後");

    v.clear();      v.resize(5);
    vec_test(v, 5, "3)clr, rsz 5, loop 5");

    v.clear();      v.resize(4);
    v.reserve(4);
    vec_test(v, 4, "4)clr, rsz 4, rsrv 4, loop 4");

    v.clear();      v.reserve(9);
    vec_test(v, v.size(), "5)clr, rsrv 9, loop v.size");

    v.clear();      v.resize(2);    v.reserve(6);
    vec_test(v, 6, "6)clr, rsz 2, rsrv 6, loop 6");

    v.clear();      v.resize(7);    v.reserve(4);
    vec_test(v, 7, "7)clr, rsz 7, rsrv 4, loop 7");

    v.pop_back();   v.pop_back();
    vec_test(v, 5, "8)pop,pop, loop 5");

    v.clear();
    vec_test(v, 0, "9)clr");
    return 0;
}

テスト 1 結果

[1)v0定義直後]
size()     = 0, capacity() = 0
v = 

[2)v(3)定義直後]
size()     = 3, capacity() = 3
v = 0, 1, 999, 

[3)clr, rsz 5, loop 5]
size()     = 5, capacity() = 5
v = 0, 1, 2, 3, 999, 

[4)clr, rsz 4, rsrv 4, loop 4]
size()     = 4, capacity() = 4
v = 0, 1, 2, 999, 

[5)clr, rsrv 9, loop v.size]
size()     = 0, capacity() = 9
v = 

[6)clr, rsz 2, rsrv 6, loop 6]
size()     = 2, capacity() = 6
out of range 2
v = 0, 999, 

[7)clr, rsz 7, rsrv 4, loop 7]
size()     = 7, capacity() = 7
v = 0, 1, 2, 3, 4, 5, 999, 

[8)pop,pop, loop 5]
size()     = 5, capacity() = 7
v = 0, 1, 2, 3, 999, 

[9)clr]
size()     = 0, capacity() = 0
v = 

[1)v0定義直後]
size()     = 0, capacity() = 0
v = 

[2)v(3)定義直後]
size()     = 3, capacity() = 3
v = 0, 1, 999, 

[3)clr, rsz 5, loop 5]
size()     = 5, capacity() = 5
v = 0, 1, 2, 3, 999, 

[4)clr, rsz 4, rsrv 4, loop 4]
size()     = 4, capacity() = 5
v = 0, 1, 2, 999, 

[5)clr, rsrv 9, loop v.size]
size()     = 0, capacity() = 9
v = 

[6)clr, rsz 2, rsrv 6, loop 6]
size()     = 2, capacity() = 9
out of range 2
v = 0, 999, 

[7)clr, rsz 7, rsrv 4, loop 7]
size()     = 7, capacity() = 9
v = 0, 1, 2, 3, 4, 5, 999, 

[8)pop,pop, loop 5]
size()     = 5, capacity() = 9
v = 0, 1, 2, 3, 999, 

[9)clr]
size()     = 0, capacity() = 9
v = 

[1)v0定義直後]
size()     = 0, capacity() = 0
v = 

[2)v(3)定義直後]
size()     = 3, capacity() = 3
v = 0, 1, 999, 

[3)clr, rsz 5, loop 5]
size()     = 5, capacity() = 5
v = 0, 1, 2, 3, 999, 

[4)clr, rsz 4, rsrv 4, loop 4]
size()     = 4, capacity() = 5
v = 0, 1, 2, 999, 

[5)clr, rsrv 9, loop v.size]
size()     = 0, capacity() = 9
v = 

[6)clr, rsz 2, rsrv 6, loop 6]
size()     = 2, capacity() = 9
out of range 2
v = 0, 999, 

[7)clr, rsz 7, rsrv 4, loop 7]
size()     = 7, capacity() = 9
v = 0, 1, 2, 3, 4, 5, 999, 

[8)pop,pop, loop 5]
size()     = 5, capacity() = 9
v = 0, 1, 2, 3, 999, 

[9)clr]
size()     = 0, capacity() = 9
v = 

vector テスト 2

#include <iostream>
#include <vector>
using namespace std;

struct Clss {
    int val_;
    Clss() : val_(0) {printf("\tClss\n");}
    Clss(const Clss &b) : val_(b.val_) {printf("\tcpy(%d)\n",val_);}
    Clss(int n) : val_(n) {printf("\t:=%d\n",val_);}
    ~Clss() {printf("\t~Clss\n"); val_ = 0;}
};

int main(void) {
    {
        printf("vector<Clss> {\n");
        vector<Clss> v;
        printf("} size=%d capa=%d\n", v.size(), v.capacity());
        //printf("resize 2 {\n");
        //v.resize(2);
        //printf("} size=%d capa=%d\n", v.size(), v.capacity());
        printf("reserve 5 {\n");
        v.reserve(5);
        printf("} size=%d capa=%d\n", v.size(), v.capacity());
        printf("resize 3 {\n");
        v.resize(3);
        printf("} size=%d capa=%d\n", v.size(), v.capacity());
        printf("[4]:=99 {\n");
        v[4] = 99;
        printf("}\n");
        printf("clear {\n");
        v.clear();
        printf("}\n");
        printf("resize 2 {\n");
        v.resize(2);
        printf("} size=%d capa=%d\n", v.size(), v.capacity());
        printf("[4]=%d\n", v[4].val_);
      #if 0
        printf("初期化のマネ {\n");
        {
            Clss tmp;
            for (int i = 0; i < 2; i++)
                new((void*)&v[i]) Clss(tmp);
        }
        printf("}\n");
      #endif
    }

    printf("main end\n");
    return 0;
}

テスト 2 結果

vector {
} size=0 capa=0
reserve 5 {
} size=0 capa=5
resize 3 {
	Clss
	cpy(0)
	cpy(0)
	cpy(0)
	cpy(0)
	~Clss
	~Clss
} size=3 capa=5
[4]:=99 {
	:=99
	~Clss
}
clear {
	~Clss
	~Clss
	~Clss
}
resize 2 {
	Clss
	cpy(0)
	cpy(0)
	cpy(0)
	~Clss
	~Clss
} size=2 capa=2
[4]=3605488
	~Clss
	~Clss
main end

vector {
} size=0 capa=0
reserve 5 {
} size=0 capa=5
resize 3 {
	Clss
	cpy(0)
	cpy(0)
	cpy(0)
	cpy(0)
	~Clss
	~Clss
} size=3 capa=5
[4]:=99 {
	:=99
	~Clss
}
clear {
	~Clss
	~Clss
	~Clss
}
resize 2 {
	Clss
	cpy(0)
	cpy(0)
	cpy(0)
	~Clss
	~Clss
} size=2 capa=5
[4]=99
	~Clss
	~Clss
main end

vector {
} size=0 capa=0
reserve 5 {
} size=0 capa=5
resize 3 {
	Clss
	cpy(0)
	cpy(0)
	cpy(0)
	~Clss
} size=3 capa=5
[4]:=99 {
	:=99
	~Clss
}
clear {
	~Clss
	~Clss
	~Clss
}
resize 2 {
	Clss
	cpy(0)
	cpy(0)
	~Clss
} size=2 capa=5
[4]=99
	~Clss
	~Clss
main end