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make FP formatting available to be used at compile-time
* works only with FMT_HEADER_ONLY * works only with float and double types (not long double)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // 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 "fmt/compile.h" | ||
| #include "gmock/gmock.h" | ||
|
|
||
| #if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806 && \ | ||
| defined(__cpp_constexpr) && __cpp_constexpr >= 201907 && \ | ||
| defined(__cpp_constexpr_dynamic_alloc) && \ | ||
| __cpp_constexpr_dynamic_alloc >= 201907 && __cplusplus >= 202002L | ||
| template <size_t max_string_length, typename Char = char> struct test_string { | ||
| template <typename T> constexpr bool operator==(const T& rhs) const noexcept { | ||
| return fmt::basic_string_view<Char>(rhs).compare(buffer) == 0; | ||
| } | ||
| Char buffer[max_string_length]{}; | ||
| }; | ||
|
|
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| template <size_t max_string_length, typename Char = char, typename... Args> | ||
| consteval auto test_format(auto format, const Args&... args) { | ||
| test_string<max_string_length, Char> string{}; | ||
| fmt::format_to(string.buffer, format, args...); | ||
| return string; | ||
| } | ||
|
|
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| TEST(compile_time_formatting_test, floating_point) { | ||
| EXPECT_EQ("0", test_format<2>(FMT_COMPILE("{}"), 0.0f)); | ||
| EXPECT_EQ("392.500000", test_format<11>(FMT_COMPILE("{0:f}"), 392.5f)); | ||
|
|
||
| EXPECT_EQ("0", test_format<2>(FMT_COMPILE("{:}"), 0.0)); | ||
| EXPECT_EQ("0.000000", test_format<9>(FMT_COMPILE("{:f}"), 0.0)); | ||
| EXPECT_EQ("0", test_format<2>(FMT_COMPILE("{:g}"), 0.0)); | ||
| EXPECT_EQ("392.65", test_format<7>(FMT_COMPILE("{:}"), 392.65)); | ||
| EXPECT_EQ("392.65", test_format<7>(FMT_COMPILE("{:g}"), 392.65)); | ||
| EXPECT_EQ("392.65", test_format<7>(FMT_COMPILE("{:G}"), 392.65)); | ||
| EXPECT_EQ("4.9014e+06", test_format<11>(FMT_COMPILE("{:g}"), 4.9014e6)); | ||
| EXPECT_EQ("-392.650000", test_format<12>(FMT_COMPILE("{:f}"), -392.65)); | ||
| EXPECT_EQ("-392.650000", test_format<12>(FMT_COMPILE("{:F}"), -392.65)); | ||
|
|
||
| EXPECT_EQ("3.926500e+02", test_format<13>(FMT_COMPILE("{0:e}"), 392.65)); | ||
| EXPECT_EQ("3.926500E+02", test_format<13>(FMT_COMPILE("{0:E}"), 392.65)); | ||
| EXPECT_EQ("+0000392.6", test_format<11>(FMT_COMPILE("{0:+010.4g}"), 392.65)); | ||
| EXPECT_EQ("9223372036854775808.000000", | ||
| test_format<27>(FMT_COMPILE("{:f}"), 9223372036854775807.0)); | ||
|
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||
| constexpr double nan = std::numeric_limits<double>::quiet_NaN(); | ||
| EXPECT_EQ("nan", test_format<4>(FMT_COMPILE("{}"), nan)); | ||
| EXPECT_EQ("+nan", test_format<5>(FMT_COMPILE("{:+}"), nan)); | ||
| if (std::signbit(-nan)) | ||
| EXPECT_EQ("-nan", test_format<5>(FMT_COMPILE("{}"), -nan)); | ||
| else | ||
| fmt::print("Warning: compiler doesn't handle negative NaN correctly"); | ||
|
|
||
| constexpr double inf = std::numeric_limits<double>::infinity(); | ||
| EXPECT_EQ("inf", test_format<4>(FMT_COMPILE("{}"), inf)); | ||
| EXPECT_EQ("+inf", test_format<5>(FMT_COMPILE("{:+}"), inf)); | ||
| EXPECT_EQ("-inf", test_format<5>(FMT_COMPILE("{}"), -inf)); | ||
| } | ||
| #endif |