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Add C++20 "starts_with" overloads

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Ion Gaztañaga
2026-01-21 23:40:18 +01:00
parent a02aae0b9f
commit dc3a96a29b
3 changed files with 41 additions and 22 deletions
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29
test/string_test.cpp
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@@ -1481,13 +1481,7 @@ void test_compare()
// Helper functions for starts_with/ends_with/contains since boost::container::string
// might not have these methods in older versions
namespace test_helpers {
bool starts_with(const string& s, const char* prefix) {
string::size_type len = std::strlen(prefix);
return s.size() >= len && s.compare(0, len, prefix) == 0;
}
bool starts_with(const string& s, char c) {
return !s.empty() && s[0] == c;
}
bool ends_with(const string& s, const char* suffix) {
string::size_type len = std::strlen(suffix);
return s.size() >= len && s.compare(s.size() - len, len, suffix) == 0;
@@ -1495,27 +1489,20 @@ namespace test_helpers {
bool ends_with(const string& s, char c) {
return !s.empty() && s[s.size() - 1] == c;
}
bool contains(const string& s, const char* substr) {
return s.find(substr) != string::npos;
}
bool contains(const string& s, char c) {
return s.find(c) != string::npos;
}
}
void test_starts_with()
{
string s("Hello, World!");
using test_helpers::starts_with;
BOOST_TEST(starts_with(s, "Hello"));
BOOST_TEST(starts_with(s, "H"));
BOOST_TEST(starts_with(s, ""));
BOOST_TEST(starts_with(s, 'H'));
BOOST_TEST(s.starts_with("Hello"));
BOOST_TEST(s.starts_with("H"));
BOOST_TEST(s.starts_with(""));
BOOST_TEST(s.starts_with('H'));
BOOST_TEST(!starts_with(s, "World"));
BOOST_TEST(!starts_with(s, "hello")); // case-sensitive
BOOST_TEST(!starts_with(s, 'W'));
BOOST_TEST(!s.starts_with("World"));
BOOST_TEST(!s.starts_with("hello")); // case-sensitive
BOOST_TEST(!s.starts_with('W'));
}
void test_ends_with()