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Add new C++ APIs for creating forall/exists expressions.

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-05-09 21:30:31 -07:00
parent 787a65be29
commit c8c5f30b49
2 changed files with 88 additions and 43 deletions
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25
examples/c++/example.cpp
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@ -907,6 +907,7 @@ void enum_sort_example() {
}
void expr_vector_example() {
std::cout << "expr_vector example\n";
context c;
const unsigned N = 10;
@ -928,6 +929,29 @@ void expr_vector_example() {
std::cout << "solution\n" << m;
}
void exists_expr_vector_example() {
std::cout << "exists expr_vector example\n";
context c;
const unsigned N = 10;
expr_vector xs(c);
expr x(c);
expr b(c);
b = c.bool_val(true);
for (unsigned i = 0; i < N; i++) {
std::stringstream x_name;
x_name << "x_" << i;
x = c.int_const(x_name.str().c_str());
xs.push_back(x);
b = b && x >= 0;
}
expr ex(c);
ex = exists(xs, b);
std::cout << ex << std::endl;
}
int main() {
try {
demorgan(); std::cout << "\n";
@ -964,6 +988,7 @@ int main() {
incremental_example3(); std::cout << "\n";
enum_sort_example(); std::cout << "\n";
expr_vector_example(); std::cout << "\n";
exists_expr_vector_example(); std::cout << "\n";
std::cout << "done\n";
}
catch (exception & ex) {

106
src/api/c++/z3++.h
View file

@ -249,6 +249,8 @@ namespace z3 {
array & operator=(array const & s);
public:
array(unsigned sz):m_size(sz) { m_array = new T[sz]; }
template<typename T2>
array(ast_vector_tpl<T2> const & v);
~array() { delete[] m_array; }
unsigned size() const { return m_size; }
T & operator[](int i) { assert(0 <= i); assert(static_cast<unsigned>(i) < m_size); return m_array[i]; }
@ -939,49 +941,6 @@ namespace z3 {
inline expr udiv(expr const & a, int b) { return udiv(a, a.ctx().num_val(b, a.get_sort())); }
inline expr udiv(int a, expr const & b) { return udiv(b.ctx().num_val(a, b.get_sort()), b); }
// Basic functions for creating quantified formulas.
// The C API should be used for creating quantifiers with patterns, weights, many variables, etc.
inline expr forall(expr const & x, expr const & b) {
check_context(x, b);
Z3_app vars[] = {(Z3_app) x};
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 1, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr const & x1, expr const & x2, expr const & b) {
check_context(x1, b); check_context(x2, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2};
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 2, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr const & x1, expr const & x2, expr const & x3, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3 };
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 3, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr const & x1, expr const & x2, expr const & x3, expr const & x4, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b); check_context(x4, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3, (Z3_app) x4 };
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 4, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x, expr const & b) {
check_context(x, b);
Z3_app vars[] = {(Z3_app) x};
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 1, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x1, expr const & x2, expr const & b) {
check_context(x1, b); check_context(x2, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2};
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 2, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x1, expr const & x2, expr const & x3, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3 };
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 3, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x1, expr const & x2, expr const & x3, expr const & x4, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b); check_context(x4, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3, (Z3_app) x4 };
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 4, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
template<typename T> class cast_ast;
template<> class cast_ast<ast> {
@ -1043,6 +1002,67 @@ namespace z3 {
friend std::ostream & operator<<(std::ostream & out, ast_vector_tpl const & v) { out << Z3_ast_vector_to_string(v.ctx(), v); return out; }
};
template<typename T>
template<typename T2>
array<T>::array(ast_vector_tpl<T2> const & v) {
m_array = new T[v.size()];
m_size = v.size();
for (unsigned i = 0; i < m_size; i++) {
m_array[i] = v[i];
}
}
// Basic functions for creating quantified formulas.
// The C API should be used for creating quantifiers with patterns, weights, many variables, etc.
inline expr forall(expr const & x, expr const & b) {
check_context(x, b);
Z3_app vars[] = {(Z3_app) x};
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 1, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr const & x1, expr const & x2, expr const & b) {
check_context(x1, b); check_context(x2, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2};
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 2, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr const & x1, expr const & x2, expr const & x3, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3 };
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 3, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr const & x1, expr const & x2, expr const & x3, expr const & x4, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b); check_context(x4, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3, (Z3_app) x4 };
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, 4, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr forall(expr_vector const & xs, expr const & b) {
array<Z3_app> vars(xs);
Z3_ast r = Z3_mk_forall_const(b.ctx(), 0, vars.size(), vars.ptr(), 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x, expr const & b) {
check_context(x, b);
Z3_app vars[] = {(Z3_app) x};
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 1, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x1, expr const & x2, expr const & b) {
check_context(x1, b); check_context(x2, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2};
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 2, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x1, expr const & x2, expr const & x3, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3 };
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 3, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr const & x1, expr const & x2, expr const & x3, expr const & x4, expr const & b) {
check_context(x1, b); check_context(x2, b); check_context(x3, b); check_context(x4, b);
Z3_app vars[] = {(Z3_app) x1, (Z3_app) x2, (Z3_app) x3, (Z3_app) x4 };
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, 4, vars, 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
inline expr exists(expr_vector const & xs, expr const & b) {
array<Z3_app> vars(xs);
Z3_ast r = Z3_mk_exists_const(b.ctx(), 0, vars.size(), vars.ptr(), 0, 0, b); b.check_error(); return expr(b.ctx(), r);
}
class func_entry : public object {
Z3_func_entry m_entry;
void init(Z3_func_entry e) {