examples/cpp/03.cpp at f6ec4e3686b9feeca0f485701b29738ab924d0d0 · makelinux/examples · GitHub

History

211 lines (169 loc) · 3.71 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

/**

@file

@brief C++03 / C++98

@defgroup CPP03 C++03 examples

@brief C++03 / C++98

https://en.wikipedia.org/wiki/C++03

#include <utility>

#include <iostream>

#include <cassert>

#include <cstring>

#include <algorithm>

#include <vector>

#include <deque>

#include <list>

#include <queue>

#include <stack>

#include <typeinfo>

using namespace std;

/**

@defgroup lang03 Language

void init_03()

{

// https://en.cppreference.com/w/cpp/language/copy_initialization

int x3 = {3};

double x4 = {3.0};

struct point { int x, y; };

point p1 = {1, 2};

(void) p1.x;

(void) p1.y;

#if gcc_extension

// designated initializers

// https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html

__extension__

point gpp_ext = { .x = 1 }; // C99-like gcc extension

__extension__

point gcc_ext = { x: 1 }; // C-like gcc extension

#endif

// Mutable

struct struct_with_mutable {

struct_with_mutable(){};

mutable int m;

} const const_struct_with_mutable;

const_struct_with_mutable.m = 2;

assert(const_struct_with_mutable.m == 2);

int y = 0;

int& reference = y;

}

template<class C>

void test_generic_container(C & c)

{

assert(c.empty());

assert(c.max_size() > 1000);

c.push_back(0);

assert(c.front() == 0);

assert(c.back() == 0);

assert(c.size() == 1);

c.erase(c.begin());

c.push_back(1);

c.erase(c.begin());

c.assign(4, 1);

assert(c.size() == 4);

c.clear();

}

template<class V>

void test_vector_container(V & v)

{

string err;

try {

v.at(666) = 0;

} catch (std::out_of_range const& exc) {

err = exc.what();

}

assert(err.length());

assert(v[0] == 1);

v.resize(4);

int arr[] = {1, 2, 3};

v.insert(v.begin(), arr, arr+3);

assert(v[1] == 2);

}

/// [container](https://en.cppreference.com/w/cpp/container)

void container_03()

{

list<int> l;

test_generic_container(l);

std::vector<int> v;

test_generic_container(v);

test_vector_container(v);

v.reserve(10);

assert(v.capacity() == 10);

deque<int> d;

test_generic_container(d);

test_vector_container(d);

stack<int> s;

queue<int> q;

}

/**

@fn void sort_03()

http://www.cplusplus.com/reference/algorithm/sort/?kw=sort

Compare with @ref lambda::sort_11

/// @private

bool func(int i, int j) { return i < j; }

/// @private

struct _ {

bool operator() (int i, int j) { return i < j; }

} functor;

void sort_03()

{

int a[] = {5, 7, 4, 2, 8, 6, 1, 9, 0, 3};

vector<int> v (a, a + sizeof a / sizeof a[0]);

// using default comparison (operator <):

sort(v.begin(), v.begin()+4);

// using function as comp

sort(v.begin() + 4, v.end(), func);

// sort using a standard library compare function object

sort(v.begin(), v.end(), greater<int>());

// using object as comp

sort (v.begin(), v.end(), functor);

int prev = -1;

for (vector<int>::iterator i=v.begin(); i != v.end(); ++i) {

assert(*i >= prev);

prev = *i;

}

/// https://en.cppreference.com/w/cpp/language/reference

int& a_ref(int &a) { return a; }

struct Common

{

int n;

Common(int x) : n(x) {}

};

/// [ref](https://en.cppreference.com/w/cpp/language/virtual)

struct Virtual_A : virtual Common { Virtual_A() : Common(1) {} };

struct Virtual_B : virtual Common { Virtual_B() : Common(2) {} };

struct Diamond : Virtual_A, Virtual_B {

Diamond() : Common(3), Virtual_A(), Virtual_B() {}

};

void types_03()

{

int a = 0;

assert(typeid(int) == typeid(a));

assert(typeid(int).name() == string("i"));

a_ref(a) = 2;

assert(a == 2);

Diamond d;

assert(d.Virtual_A::n == 3);

assert(d.Virtual_B::n == 3);

}

/// @}

int main(void)

{

assert(__cplusplus == 199711);

init_03();

container_03();

sort_03();

types_03();

assert(min(1,2) == 1);

assert(max(1,2) == 2);

pair<int, char> p(1, 'a');

assert(p.first == 1);

assert(p.second == 'a');

p = std::make_pair('b', 2);

assert(p.first == 'b');

}

/// @}

examples/cpp/03.cpp at f6ec4e3686b9feeca0f485701b29738ab924d0d0 · makelinux/examples · GitHub

Expand file tree

Breadcrumbs

03.cpp

Latest commit

History

Breadcrumbs

03.cpp

File metadata and controls