spdlog error: “don't know how to format the type, include fmt/ostream.h if it provides an operator<<...

up vote
0
down vote

favorite

I've just picked up spdlog in an effort to improve our logging. Our logging is very basic, so I'm just copying the "multi sink" example almost verbatim to log to file and console.

However, even when following the example exactly, I get:

Error C2338 don't know how to format the type, include fmt/ostream.h if it provides an operator<< that should be used Logger d:tfsdevelopmentbladedmainexternalspdlogspdlog-1.xincludespdlogfmtbundledcore.h 351

Coming from core.h:

// A formatter for objects of type T.

template <typename T, typename Char = char, typename Enable = void>

struct formatter {

  static_assert(no_formatter_error<T>::value,

    "don't know how to format the type, include fmt/ostream.h if it provides "

    "an operator<< that should be used");

I'm presuming this is really easy to fix, but I can't see it...

[basic Win32 usage]

edited Nov 22 at 14:27

asked Nov 22 at 14:15

Mike Sadler

61111024

1

You might want to add a Minimal, Complete, and Verifiable example
– anatolyg
Nov 22 at 14:17

Also, you might want to specify your environment, like the version of your compiler, OS, etc.
– anatolyg
Nov 22 at 14:21

Did you try include fmt/ostream.h like the error suggests?
– xtofl
Nov 22 at 14:21

1

@MikeSadler What type are you trying to format? Wild guess -- are you using std::string or similar, and forgot to #include <string> in your source?
– PaulMcKenzie
Nov 22 at 14:32

1

ok. I think you should write up the solution, since I only gave hints and you know the library better than I do.
– PaulMcKenzie
Nov 22 at 14:49

|
show 9 more comments

up vote
0
down vote

favorite

I've just picked up spdlog in an effort to improve our logging. Our logging is very basic, so I'm just copying the "multi sink" example almost verbatim to log to file and console.

However, even when following the example exactly, I get:

Coming from core.h:

// A formatter for objects of type T.

template <typename T, typename Char = char, typename Enable = void>

struct formatter {

  static_assert(no_formatter_error<T>::value,

    "don't know how to format the type, include fmt/ostream.h if it provides "

    "an operator<< that should be used");

I'm presuming this is really easy to fix, but I can't see it...

[basic Win32 usage]

edited Nov 22 at 14:27

asked Nov 22 at 14:15

Mike Sadler

61111024

1

You might want to add a Minimal, Complete, and Verifiable example
– anatolyg
Nov 22 at 14:17

Also, you might want to specify your environment, like the version of your compiler, OS, etc.
– anatolyg
Nov 22 at 14:21

Did you try include fmt/ostream.h like the error suggests?
– xtofl
Nov 22 at 14:21

1

@MikeSadler What type are you trying to format? Wild guess -- are you using std::string or similar, and forgot to #include <string> in your source?
– PaulMcKenzie
Nov 22 at 14:32

1

ok. I think you should write up the solution, since I only gave hints and you know the library better than I do.
– PaulMcKenzie
Nov 22 at 14:49

|
show 9 more comments

up vote
0
down vote

favorite

I've just picked up spdlog in an effort to improve our logging. Our logging is very basic, so I'm just copying the "multi sink" example almost verbatim to log to file and console.

However, even when following the example exactly, I get:

Coming from core.h:

// A formatter for objects of type T.

template <typename T, typename Char = char, typename Enable = void>

struct formatter {

  static_assert(no_formatter_error<T>::value,

    "don't know how to format the type, include fmt/ostream.h if it provides "

    "an operator<< that should be used");

I'm presuming this is really easy to fix, but I can't see it...

[basic Win32 usage]

edited Nov 22 at 14:27

asked Nov 22 at 14:15

Mike Sadler

61111024

I've just picked up spdlog in an effort to improve our logging. Our logging is very basic, so I'm just copying the "multi sink" example almost verbatim to log to file and console.

However, even when following the example exactly, I get:

Coming from core.h:

// A formatter for objects of type T.

template <typename T, typename Char = char, typename Enable = void>

struct formatter {

  static_assert(no_formatter_error<T>::value,

    "don't know how to format the type, include fmt/ostream.h if it provides "

    "an operator<< that should be used");

I'm presuming this is really easy to fix, but I can't see it...

[basic Win32 usage]

c++ spdlog

edited Nov 22 at 14:27

asked Nov 22 at 14:15

Mike Sadler

61111024

edited Nov 22 at 14:27

asked Nov 22 at 14:15

Mike Sadler

61111024

edited Nov 22 at 14:27

asked Nov 22 at 14:15

Mike Sadler

61111024

asked Nov 22 at 14:15

Mike Sadler

61111024

asked Nov 22 at 14:15

Mike Sadler

61111024

1

You might want to add a Minimal, Complete, and Verifiable example
– anatolyg
Nov 22 at 14:17

Also, you might want to specify your environment, like the version of your compiler, OS, etc.
– anatolyg
Nov 22 at 14:21

Did you try include fmt/ostream.h like the error suggests?
– xtofl
Nov 22 at 14:21

1

@MikeSadler What type are you trying to format? Wild guess -- are you using std::string or similar, and forgot to #include <string> in your source?
– PaulMcKenzie
Nov 22 at 14:32

1

ok. I think you should write up the solution, since I only gave hints and you know the library better than I do.
– PaulMcKenzie
Nov 22 at 14:49

|
show 9 more comments

1

You might want to add a Minimal, Complete, and Verifiable example
– anatolyg
Nov 22 at 14:17

Also, you might want to specify your environment, like the version of your compiler, OS, etc.
– anatolyg
Nov 22 at 14:21

Did you try include fmt/ostream.h like the error suggests?
– xtofl
Nov 22 at 14:21

1

@MikeSadler What type are you trying to format? Wild guess -- are you using std::string or similar, and forgot to #include <string> in your source?
– PaulMcKenzie
Nov 22 at 14:32

1

ok. I think you should write up the solution, since I only gave hints and you know the library better than I do.
– PaulMcKenzie
Nov 22 at 14:49

You might want to add a Minimal, Complete, and Verifiable example
– anatolyg
Nov 22 at 14:17

Also, you might want to specify your environment, like the version of your compiler, OS, etc.
– anatolyg
Nov 22 at 14:21

Did you try include fmt/ostream.h like the error suggests?
– xtofl
Nov 22 at 14:21

@MikeSadler What type are you trying to format? Wild guess -- are you using std::string or similar, and forgot to #include <string> in your source?
– PaulMcKenzie
Nov 22 at 14:32

ok. I think you should write up the solution, since I only gave hints and you know the library better than I do.
– PaulMcKenzie
Nov 22 at 14:49

|
show 9 more comments

1 Answer
1

active

oldest

votes

up vote
2
down vote

With @PaulMcKenzie pointing me in the right direction, it seems that I was trying to log a type of string that spdlog cannot handle by default (std::wstrings).

Visual Studio's Intellisense seemed to be confused by the templating, making it appear to be happy with my sending spdlog::warn a std::wstring.

Solution: either just use std::string, or if you want to use wstrings you (probably) need to define a custome formatter for them.

answered Nov 22 at 14:54

Mike Sadler

61111024

1

You can define SPDLOG_WCHAR_TO_UTF8_SUPPORT before including spdlog.h to format wstrings like this: logger->info(L”some wstring param: {}”, wstr);
– GabiMe
Nov 24 at 11:05

add a comment |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53432887%2fspdlog-error-dont-know-how-to-format-the-type-include-fmt-ostream-h-if-it-pr%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
2
down vote

With @PaulMcKenzie pointing me in the right direction, it seems that I was trying to log a type of string that spdlog cannot handle by default (std::wstrings).

Visual Studio's Intellisense seemed to be confused by the templating, making it appear to be happy with my sending spdlog::warn a std::wstring.

Solution: either just use std::string, or if you want to use wstrings you (probably) need to define a custome formatter for them.

answered Nov 22 at 14:54

Mike Sadler

61111024

1

You can define SPDLOG_WCHAR_TO_UTF8_SUPPORT before including spdlog.h to format wstrings like this: logger->info(L”some wstring param: {}”, wstr);
– GabiMe
Nov 24 at 11:05

add a comment |

up vote
2
down vote

With @PaulMcKenzie pointing me in the right direction, it seems that I was trying to log a type of string that spdlog cannot handle by default (std::wstrings).

Visual Studio's Intellisense seemed to be confused by the templating, making it appear to be happy with my sending spdlog::warn a std::wstring.

Solution: either just use std::string, or if you want to use wstrings you (probably) need to define a custome formatter for them.

answered Nov 22 at 14:54

Mike Sadler

61111024

1

You can define SPDLOG_WCHAR_TO_UTF8_SUPPORT before including spdlog.h to format wstrings like this: logger->info(L”some wstring param: {}”, wstr);
– GabiMe
Nov 24 at 11:05

add a comment |

up vote
2
down vote

With @PaulMcKenzie pointing me in the right direction, it seems that I was trying to log a type of string that spdlog cannot handle by default (std::wstrings).

Visual Studio's Intellisense seemed to be confused by the templating, making it appear to be happy with my sending spdlog::warn a std::wstring.

Solution: either just use std::string, or if you want to use wstrings you (probably) need to define a custome formatter for them.

answered Nov 22 at 14:54

Mike Sadler

61111024

With @PaulMcKenzie pointing me in the right direction, it seems that I was trying to log a type of string that spdlog cannot handle by default (std::wstrings).

Visual Studio's Intellisense seemed to be confused by the templating, making it appear to be happy with my sending spdlog::warn a std::wstring.

Solution: either just use std::string, or if you want to use wstrings you (probably) need to define a custome formatter for them.

answered Nov 22 at 14:54

Mike Sadler

61111024

answered Nov 22 at 14:54

Mike Sadler

61111024

answered Nov 22 at 14:54

Mike Sadler

61111024

answered Nov 22 at 14:54

Mike Sadler

61111024

1

You can define SPDLOG_WCHAR_TO_UTF8_SUPPORT before including spdlog.h to format wstrings like this: logger->info(L”some wstring param: {}”, wstr);
– GabiMe
Nov 24 at 11:05

add a comment |

1

You can define SPDLOG_WCHAR_TO_UTF8_SUPPORT before including spdlog.h to format wstrings like this: logger->info(L”some wstring param: {}”, wstr);
– GabiMe
Nov 24 at 11:05

You can define SPDLOG_WCHAR_TO_UTF8_SUPPORT before including spdlog.h to format wstrings like this: logger->info(L”some wstring param: {}”, wstr);
– GabiMe
Nov 24 at 11:05

add a comment |

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

Some of your past answers have not been well-received, and you're in danger of being blocked from answering.

Please pay close attention to the following guidance:

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Qfyilyi