Add tests for FMT_ENFORCE_COMPILE_STRING, fix several errors (#2038)

test/CMakeLists.txt

@@ -106,6 +106,14 @@ add_fmt_test(printf-test)
 add_fmt_test(ranges-test)
 add_fmt_test(scan-test)
 
+if (NOT MSVC)
+  # FMT_ENFORCE_COMPILE_STRING not supported under MSVC
+  # See https://developercommunity.visualstudio.com/content/problem/1277597/internal-compiler-c0001-error-on-complex-nested-la.html
+  add_fmt_test(enforce-compile-string-test)
+  target_compile_definitions(enforce-compile-string-test PRIVATE
+    "-DFMT_ENFORCE_COMPILE_STRING")
+endif()
+
 if (NOT DEFINED MSVC_STATIC_RUNTIME AND MSVC)
   foreach (flag_var
 			 CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE

test/enforce-compile-string-test.cc

@@ -0,0 +1,74 @@
+// Formatting library for C++ - formatting library tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include <array>
+#include <chrono>
+#include <iterator>
+#include <list>
+#include <string>
+
+#include "fmt/chrono.h"
+#include "fmt/color.h"
+#include "fmt/format.h"
+#include "fmt/locale.h"
+#include "fmt/ostream.h"
+#include "fmt/ranges.h"
+
+// Exercise the API to verify that everything we expect to can compile.
+void test_format_api() {
+  fmt::format(FMT_STRING("{}"), 42);
+  fmt::format(FMT_STRING(L"{}"), 42);
+  fmt::format(FMT_STRING("noop"));
+
+  fmt::to_string(42);
+  fmt::to_wstring(42);
+
+  std::list<char> out;
+  fmt::format_to(std::back_inserter(out), FMT_STRING("{}"), 42);
+
+  char buffer[4];
+  fmt::format_to_n(buffer, 3, FMT_STRING("{}"), 12345);
+
+  wchar_t wbuffer[4];
+  fmt::format_to_n(wbuffer, 3, FMT_STRING(L"{}"), 12345);
+}
+
+void test_literals_api() {
+#if FMT_USE_UDL_TEMPLATE
+  using namespace fmt::literals;
+  "{}c{}"_format("ab", 1);
+  L"{}c{}"_format(L"ab", 1);
+#endif
+}
+
+void test_chrono() {
+  fmt::format(FMT_STRING("{}"), std::chrono::seconds(42));
+  fmt::format(FMT_STRING(L"{}"), std::chrono::seconds(42));
+}
+
+void test_text_style() {
+  fmt::print(fg(fmt::rgb(255, 20, 30)), FMT_STRING("{}"), "rgb(255,20,30)");
+  fmt::format(fg(fmt::rgb(255, 20, 30)), FMT_STRING("{}"), "rgb(255,20,30)");
+
+  fmt::text_style ts = fg(fmt::rgb(255, 20, 30));
+  std::string out;
+  fmt::format_to(std::back_inserter(out), ts,
+                 FMT_STRING("rgb(255,20,30){}{}{}"), 1, 2, 3);
+}
+
+void test_range() {
+  std::array<char, 5> hello = {'h', 'e', 'l', 'l', 'o'};
+  fmt::format(FMT_STRING("{}"), hello);
+}
+
+int main() {
+  test_format_api();
+  test_literals_api();
+  test_chrono();
+  test_text_style();
+  test_range();
+}

test/ranges-test.cc

@@ -51,6 +51,11 @@ TEST(RangesTest, FormatMap) {
   EXPECT_EQ("{(\"one\", 1), (\"two\", 2)}", fmt::format("{}", simap));
 }
 
+TEST(RangesTest, FormatArrayOfLiterals) {
+  const char* aol[] = {"1234", "abcd"};
+  EXPECT_EQ("{\"1234\", \"abcd\"}", fmt::format("{}", aol));
+}
+
 TEST(RangesTest, FormatPair) {
   std::pair<int64_t, float> pa1{42, 1.5f};
   EXPECT_EQ("(42, 1.5)", fmt::format("{}", pa1));