Add user-defined string literals to create buffers

Author: gummif

tests/buffer.cpp

@@ -250,6 +250,38 @@ TEST_CASE("const_buffer creation with str_buffer", "[buffer]")
     CHECK(std::string(static_cast<const char*>(b2.data()), b2.size()) == "hello");
 }
 
+TEST_CASE("const_buffer creation with zbuf string literal char", "[buffer]")
+{
+    using namespace zmq::literals;
+    constexpr zmq::const_buffer b = "hello"_zbuf;
+    CHECK(b.size() == 5);
+    CHECK(std::memcmp(b.data(), "hello", b.size()) == 0);
+}
+
+TEST_CASE("const_buffer creation with zbuf string literal wchar_t", "[buffer]")
+{
+    using namespace zmq::literals;
+    constexpr zmq::const_buffer b = L"hello"_zbuf;
+    CHECK(b.size() == 5 * sizeof(wchar_t));
+    CHECK(std::memcmp(b.data(), L"hello", b.size()) == 0);
+}
+
+TEST_CASE("const_buffer creation with zbuf string literal char16_t", "[buffer]")
+{
+    using namespace zmq::literals;
+    constexpr zmq::const_buffer b = u"hello"_zbuf;
+    CHECK(b.size() == 5 * sizeof(char16_t));
+    CHECK(std::memcmp(b.data(), u"hello", b.size()) == 0);
+}
+
+TEST_CASE("const_buffer creation with zbuf string literal char32_t", "[buffer]")
+{
+    using namespace zmq::literals;
+    constexpr zmq::const_buffer b = U"hello"_zbuf;
+    CHECK(b.size() == 5 * sizeof(char32_t));
+    CHECK(std::memcmp(b.data(), U"hello", b.size()) == 0);
+}
+
 TEST_CASE("buffer of structs", "[buffer]")
 {
     struct some_pod

zmq.hpp

@@ -1124,6 +1124,26 @@ constexpr const_buffer str_buffer(const Char (&data)[N]) noexcept
                         (N - 1) * sizeof(Char));
 }
 
+namespace literals
+{
+    constexpr const_buffer operator"" _zbuf(const char* str, size_t len) noexcept
+    {
+        return const_buffer(str, len * sizeof(char));
+    }
+    constexpr const_buffer operator"" _zbuf(const wchar_t* str, size_t len) noexcept
+    {
+        return const_buffer(str, len * sizeof(wchar_t));
+    }
+    constexpr const_buffer operator"" _zbuf(const char16_t* str, size_t len) noexcept
+    {
+        return const_buffer(str, len * sizeof(char16_t));
+    }
+    constexpr const_buffer operator"" _zbuf(const char32_t* str, size_t len) noexcept
+    {
+        return const_buffer(str, len * sizeof(char32_t));
+    }
+}
+
 #endif // ZMQ_CPP11
 
 namespace detail