59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
#include <array>
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#include <string>
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#define FMT_ENABLE_COMPILE_TIME_FORMATTING 1
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#include "fmt/format.h"
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#include "gmock.h"
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#include "gtest-extra.h"
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template <size_t max_string_length> struct constexpr_buffer_helper {
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template <typename Func>
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constexpr constexpr_buffer_helper& modify(Func func) {
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func(buffer);
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return *this;
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}
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template <typename T> constexpr bool operator==(const T& rhs) const noexcept {
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return (std::string_view(rhs).compare(buffer.data()) == 0);
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}
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std::array<char, max_string_length> buffer{};
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};
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TEST(CompileTimeFormattingTest, OneInteger) {
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constexpr auto result42 = constexpr_buffer_helper<3>{}.modify(
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[](auto& buffer) { fmt::format_to(buffer.data(), "{}", 42); });
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EXPECT_EQ(result42, "42");
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constexpr auto result420 = constexpr_buffer_helper<3>{}.modify(
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[](auto& buffer) { fmt::format_to(buffer.data(), "{}", 420); });
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EXPECT_EQ(result420, "420");
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}
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TEST(CompileTimeFormattingTest, TwoIntegers) {
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constexpr auto result = constexpr_buffer_helper<6>{}.modify(
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[](auto& buffer) { fmt::format_to(buffer.data(), "{} {}", 41, 43); });
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EXPECT_EQ(result, "41 43");
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}
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TEST(CompileTimeFormattingTest, OneString) {
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constexpr auto result = constexpr_buffer_helper<3>{}.modify(
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[](auto& buffer) { fmt::format_to(buffer.data(), "{}", "42"); });
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EXPECT_EQ(result, "42");
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}
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TEST(CompileTimeFormattingTest, TwoStrings) {
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constexpr auto result =
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constexpr_buffer_helper<17>{}.modify([](auto& buffer) {
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fmt::format_to(buffer.data(), "{} is {}", "The answer", "42");
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});
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EXPECT_EQ(result, "The answer is 42");
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}
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TEST(CompileTimeFormattingTest, StringAndInteger) {
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constexpr auto result =
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constexpr_buffer_helper<17>{}.modify([](auto& buffer) {
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fmt::format_to(buffer.data(), "{} is {}", "The answer", 42);
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});
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EXPECT_EQ(result, "The answer is 42");
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}
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