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Copy pathoperator_sections_test.cpp
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378 lines (374 loc) · 9.55 KB
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#include "catch2/catch_test_macros.hpp"
#define CPPUTILS_ENABLE_CALL_MACROS
#include "cpputils/functional/operator_sections.hpp"
using cpputils::_; // NOLINT
namespace {
struct Obj {
[[nodiscard]] int get() const { return v; }
[[nodiscard]] Obj square() const {
return Obj{v * v};
}
[[nodiscard]] int mult(int m) const {
return v * m;
}
[[nodiscard]] int operator()(int j) const {
return v + j;
}
int v{42};
};
} // namespace
// NOLINTNEXTLINE
TEST_CASE("sections test", "[test terse syntax for lambda functions]") {
SECTION("operator +") {
auto const sum = _ + _;
REQUIRE(sum(1, 2) == 3);
}
SECTION("partial operator +") {
{
auto const add_10 = _ + 10;
REQUIRE(add_10(1) == 11);
}
{
auto const add_10 = 10 + _;
REQUIRE(add_10(1) == 11);
}
}
///
SECTION("partial operator -") {
{
auto const subtract_10 = _ - 10;
REQUIRE(subtract_10(1) == -9);
}
{
auto const subtract_10 = 10 - _;
REQUIRE(subtract_10(10) == 0);
}
}
SECTION("operator -") {
auto const subtract = _ - _;
REQUIRE(subtract(1, 2) == -1);
}
SECTION("Unary minus") {
auto const negate = -_;
REQUIRE(negate(1) == -1);
}
SECTION("Unary plus") {
auto const do_plus = +_;
REQUIRE(do_plus('a') == (+'a'));
}
///
SECTION("operator *") {
auto const mul = _ * _;
REQUIRE(mul(3, 2) == 6);
}
SECTION("partial operator *") {
{
auto const mul_10 = _ * 10;
REQUIRE(mul_10(2) == 20);
}
{
auto const mul_10 = 10 * _;
REQUIRE(mul_10(2) == 20);
}
}
///
SECTION("operator /") {
auto const div = _ / _;
REQUIRE(div(6, 2) == 3);
}
SECTION("partial operator /") {
{
auto const div_10 = _ / 10;
REQUIRE(div_10(20) == 2);
}
{
auto const ten_div = 10 / _;
REQUIRE(ten_div(2) == 5);
}
}
///
SECTION("operator %") {
auto const mod = _ % _;
REQUIRE(mod(7, 2) == 1);
}
SECTION("partial operator %") {
{
auto const mod_2 = _ % 2;
REQUIRE(mod_2(3) == 1);
}
{
auto const ten_mod = 10 % _;
REQUIRE(ten_mod(3) == 1);
}
}
///
SECTION("operator ==") {
auto const eq = _ == _;
REQUIRE_FALSE(eq(7, 2));
REQUIRE(eq(2, 2));
}
SECTION("partial operator ==") {
{
auto const eq_2 = _ == 2;
REQUIRE(eq_2(2));
REQUIRE_FALSE(eq_2(1));
}
{
auto const eq_2 = 2 == _;
REQUIRE(eq_2(2));
REQUIRE_FALSE(eq_2(1));
}
}
///
SECTION("operator !=") {
auto const neq = _ != _;
REQUIRE(neq(7, 2));
REQUIRE_FALSE(neq(2, 2));
}
SECTION("partial operator !=") {
{
auto const neq_2 = _ != 2;
REQUIRE_FALSE(neq_2(2));
REQUIRE(neq_2(1));
}
{
auto const neq_2 = 2 != _;
REQUIRE_FALSE(neq_2(2));
REQUIRE(neq_2(1));
}
}
///
SECTION("operator >") {
auto const gt = _ > _;
REQUIRE(gt(7, 2));
REQUIRE_FALSE(gt(2, 2));
}
SECTION("partial operator >") {
{
auto const gt_2 = _ > 2;
REQUIRE_FALSE(gt_2(2));
REQUIRE(gt_2(3));
}
{
auto const lt_2 = 2 > _;
REQUIRE_FALSE(lt_2(2));
REQUIRE(lt_2(1));
}
}
///
SECTION("operator >=") {
auto const ge = _ >= _;
REQUIRE(ge(7, 2));
REQUIRE(ge(2, 2));
REQUIRE_FALSE(ge(1, 2));
}
SECTION("partial operator >=") {
{
auto const ge_2 = _ >= 2;
REQUIRE(ge_2(2));
REQUIRE(ge_2(3));
REQUIRE_FALSE(ge_2(1));
}
{
auto const le_2 = 2 >= _;
REQUIRE(le_2(2));
REQUIRE(le_2(1));
REQUIRE_FALSE(le_2(3));
}
}
///
SECTION("operator <") {
auto const lt = _ < _;
REQUIRE_FALSE(lt(7, 2));
REQUIRE(lt(1, 2));
}
SECTION("partial operator <") {
{
auto const lt_2 = _ < 2;
REQUIRE_FALSE(lt_2(2));
REQUIRE(lt_2(1));
}
{
auto const gt_2 = 2 < _;
REQUIRE_FALSE(gt_2(2));
REQUIRE(gt_2(3));
}
}
///
SECTION("operator <=") {
auto const le = _ <= _;
REQUIRE_FALSE(le(7, 2));
REQUIRE(le(2, 2));
REQUIRE(le(1, 2));
}
SECTION("partial operator <=") {
{
auto const le_2 = _ <= 2;
REQUIRE(le_2(2));
REQUIRE_FALSE(le_2(3));
REQUIRE(le_2(1));
}
{
auto const ge_2 = 2 <= _;
REQUIRE(ge_2(2));
REQUIRE_FALSE(ge_2(1));
REQUIRE(ge_2(3));
}
}
///
SECTION("operator !") {
auto const neg = !_;
REQUIRE(neg(false));
REQUIRE_FALSE(neg(true));
}
///
SECTION("operator &&") {
auto const and_ = _ && _;
REQUIRE(and_(true, true));
REQUIRE_FALSE(and_(true, false));
}
SECTION("partial operator &&") {
{
auto const and_true = _ && true;
REQUIRE(and_true(true));
REQUIRE_FALSE(and_true(false));
}
{
auto const and_true = true && _;
REQUIRE(and_true(true));
REQUIRE_FALSE(and_true(false));
}
}
///
SECTION("operator ||") {
auto const or_ = _ || _;
REQUIRE(or_(false, true));
REQUIRE_FALSE(or_(false, false));
}
SECTION("partial operator ||") {
{
auto const or_false = _ || false;
REQUIRE(or_false(true));
REQUIRE_FALSE(or_false(false));
}
{
auto const true_or = true || _;
REQUIRE(true_or(true));
REQUIRE(true_or(false));
}
}
///
SECTION("operator ~") {
auto const neg = ~_;
REQUIRE(neg(2U) == ~2U);
}
///
SECTION("operator &") {
auto const and_ = _ & _;
REQUIRE(and_(5U, 3U) == (5U & 3U));
}
SECTION("partial operator &") {
{
auto const and_3 = _ & 3U;
REQUIRE(and_3(2U) == (2U & 3U));
}
{
auto const three_and = 3U & _;
REQUIRE(three_and(2U) == (3U & 2U));
}
}
///
SECTION("operator |") {
auto const or_ = _ | _;
REQUIRE(or_(5U, 3U) == (5U | 3U));
}
SECTION("partial operator |") {
{
auto const or_3 = _ | 3U;
REQUIRE(or_3(2U) == (2U | 3U));
}
{
auto const three_or = 3U | _;
REQUIRE(three_or(2U) == (3U | 2U));
}
}
///
SECTION("operator ^") {
auto const xor_ = _ ^ _;
REQUIRE(xor_(5U, 3U) == (5U ^ 3U));
}
SECTION("partial operator ^") {
{
auto const xor_3 = _ ^ 3U;
REQUIRE(xor_3(2U) == (2U ^ 3U));
}
{
auto const three_xor = 3U ^ _;
REQUIRE(three_xor(2U) == (3U ^ 2U));
}
}
SECTION("fn") {
auto const getter = _.fn(&Obj::get);
REQUIRE(getter(Obj{}) == Obj{}.get());
}
SECTION("fn and wildcard") {
{
auto const greater_than_40 = _.fn(&Obj::get) > 40;
REQUIRE(greater_than_40(Obj{}));
}
{
auto const equal = _.fn(&Obj::get) == Obj{}.get();
REQUIRE(equal(Obj{}));
}
{
auto const less_than_40 = _.fn(&Obj::get) < 40;
REQUIRE_FALSE(less_than_40(Obj{}));
}
{
auto const is_greater = _.fn(&Obj::get) > _.fn(&Obj::get);
REQUIRE(is_greater(Obj{10}, Obj{1}));
}
{
auto const is_greater = _.fn(&Obj::get) > _;
REQUIRE(is_greater(Obj{10}, 1));
}
}
// SECTION("fn and wildcard chained") {
// {
// auto const square_greater_than = _.fn(&Obj::square).fn(&Obj::get) > _;
// REQUIRE_FALSE(square_greater_than(Obj{1}, 4));
// REQUIRE(square_greater_than(Obj{3}, 4));
// }
// {
// auto const square_greater_than = _.fn(&Obj::square, &Obj::get) > _;
// REQUIRE_FALSE(square_greater_than(Obj{1}, 4));
// REQUIRE(square_greater_than(Obj{3}, 4));
// }
// }
SECTION("fn and wildcard macros") {
{
auto const value_greater_than = _.fn(CALL(get)) > _;
REQUIRE_FALSE(value_greater_than(Obj{1}, 4));
REQUIRE(value_greater_than(Obj{5}, 4));
}
{
auto const x = 2;
auto const equal = _.fn(CALL_C(mult, x)) == _;
REQUIRE_FALSE(equal(Obj{1}, 3));
REQUIRE(equal(Obj{2}, 4));
}
{
auto const x = 2;
auto const equal = _.fn(CALL_R(mult, x)) == _;
REQUIRE_FALSE(equal(Obj{1}, 3));
REQUIRE(equal(Obj{2}, 4));
}
}
// SECTION("fn and wildcard callable") {
// {
// auto const sum_10_equal_to = _.args(10) == _;
// REQUIRE_FALSE(sum_10_equal_to(Obj{1}, 10));
// REQUIRE(sum_10_equal_to(Obj{1}, 11));
// }
// }
}
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