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fix test: copy Z3_ast_to_string results before next call

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Z3_ast_to_string returns a pointer to an internal buffer that is
overwritten on the next call. Store results in std::string immediately
to avoid reading a stale, garbled buffer.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Lev Nachmanson 2026-03-19 13:16:27 -10:00 • committed by Lev Nachmanson
parent 1c70b9e6ee
commit fbbb582650
1 changed files with 8 additions and 7 deletions
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15
src/test/api.cpp
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@ -576,16 +576,17 @@ void tst_box_independent() {
unsigned idx_min_a_2 = Z3_optimize_minimize(ctx, opt2, a); unsigned idx_min_a_2 = Z3_optimize_minimize(ctx, opt2, a);
ENSURE(Z3_optimize_check(ctx, opt2, 0, nullptr) == Z3_L_TRUE); ENSURE(Z3_optimize_check(ctx, opt2, 0, nullptr) == Z3_L_TRUE);
// The shared objectives must have the same optimal values // The shared objectives must have the same optimal values.
Z3_string val_max3 = Z3_ast_to_string(ctx, Z3_optimize_get_lower(ctx, opt3, idx_max_expr_3)); // Copy strings immediately since Z3_ast_to_string reuses an internal buffer.
Z3_string val_max2 = Z3_ast_to_string(ctx, Z3_optimize_get_lower(ctx, opt2, idx_max_expr_2)); std::string val_max3 = Z3_ast_to_string(ctx, Z3_optimize_get_lower(ctx, opt3, idx_max_expr_3));
std::string val_max2 = Z3_ast_to_string(ctx, Z3_optimize_get_lower(ctx, opt2, idx_max_expr_2));
std::cout << "maximize expr with 3 obj: " << val_max3 << ", with 2 obj: " << val_max2 << std::endl; std::cout << "maximize expr with 3 obj: " << val_max3 << ", with 2 obj: " << val_max2 << std::endl;
ENSURE(std::string(val_max3) == std::string(val_max2)); ENSURE(val_max3 == val_max2);
Z3_string val_min3 = Z3_ast_to_string(ctx, Z3_optimize_get_upper(ctx, opt3, idx_min_a_3)); std::string val_min3 = Z3_ast_to_string(ctx, Z3_optimize_get_upper(ctx, opt3, idx_min_a_3));
Z3_string val_min2 = Z3_ast_to_string(ctx, Z3_optimize_get_upper(ctx, opt2, idx_min_a_2)); std::string val_min2 = Z3_ast_to_string(ctx, Z3_optimize_get_upper(ctx, opt2, idx_min_a_2));
std::cout << "minimize a with 3 obj: " << val_min3 << ", with 2 obj: " << val_min2 << std::endl; std::cout << "minimize a with 3 obj: " << val_min3 << ", with 2 obj: " << val_min2 << std::endl;
ENSURE(std::string(val_min3) == std::string(val_min2)); ENSURE(val_min3 == val_min2);
Z3_optimize_dec_ref(ctx, opt3); Z3_optimize_dec_ref(ctx, opt3);
Z3_optimize_dec_ref(ctx, opt2); Z3_optimize_dec_ref(ctx, opt2);