tvl-depot/third_party/immer/test/box/vector-of-boxes-transient.cpp

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//
// immer: immutable data structures for C++
// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
//
// This software is distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
//
#include <immer/box.hpp>
#include <immer/vector.hpp>
#include <immer/vector_transient.hpp>
#include <catch.hpp>
TEST_CASE("issue-33")
{
using Element = immer::box<std::string>;
auto vect = immer::vector<Element>{};
// this one works fine
for (auto i = 0; i < 100; ++i) {
vect = vect.push_back(Element("x"));
}
// this one doesn't compile
auto t = vect.transient();
for (auto i = 0; i < 100; ++i) {
t.push_back(Element("x"));
}
vect = t.persistent();
CHECK(*vect[0] == "x");
CHECK(*vect[99] == "x");
}